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I'm looking for an affordable motherboard for GPU mining that would have at least the requirements to be compatible with the latest GPUs. I think it is based on the PCI-E 2 or PCI-E  connections, am I right? Sorry, but not sure how to set up the GPUs on the motherboard.
I have been looking into ASRock motherboards (since they are cheaper) but I'm not sure if they are recommended for this tasks. I would like to know your thoughts about this matter. Thanks.  :)

You want to look at two motherboards and probably those two only:
ASRock H61 Pro BTC (http://www.asrock.com/mb/Intel/H61%20Pro%20BTC/) and ASRock H81 Pro BTC (http://www.asrock.com/mb/Intel/H81%20Pro%20BTC/).
The main difference between them is the CPU socket.

These motherboards can easily handle 6 cards but you'll need PCI-E risers. I'd highly recommend only using powered USB risers (http://g03.a.alicdn.com/kf/HTB1ouVkIXXXXXaYXpXXq6xXFXXX6/NEW-PCI-E-1x-to-16x-Powered-1-0M-USB-3-0-Extender-Riser-Adapter-card.jpg) and avoiding ribbon risers (http://www.landmarkpc.co.za/store/images/LMC-PCIER-19.jpg) at all costs.

If you want a motherboard in which you can put cards without risers you're going to have to reach deep into your pocket and even then you'll probably run into thermal throttling with some beefier cards if they are that close together.

Feel free to ask anything about mining here on in pm.

Thank you mate! You helped me choose a decent motherboard to use for GPU mining. There is a little concern that I have and that is once everything is set up, how do I configure the mining process. In this case, how could I configure CGminer to use all 6 GPUs for example?  ;D

Both windows and linux should recognize the cards without any issues. Though I'm not familiar with cg/sgminer it's probably just a command line argument. But you may want to look into the documentation of the miner because there will be tons of settings you'll have to get familiar with.

Thanks for your reply. I will just take a look at the available commands to get started in this business. It is a very exciting world out there for a miner (at least I think)  :)

It is exciting and a great hobby but it's not very profitable anymore. ROI is well over a year for most miners with average electricity costs.

Asrock H61 and H81 motherboards are the cheapest 6 PCIE boards for mining. The board has 2 extra molex connectors. So you can use non powered risers. I would suggest using 2 powered, 4 unpowered.

Always go all powered. 

Yes, you say - all powered risers is overkill and technically not necessary - but the cost diff. between a powered vs. non-powered riser is minimal, so why take the chance with non-powered risers?

This!

Could it be profitable if I don't need to pay for electricity costs? Let's say I use solar and wind power for all my miners...will it still be profitable? Anyways, I  don't mind since I will only do it for fun.  ;D

It can be profitable with average electricity but with free electricity it's much more profitable. Let's say a 6 card rig with modern GPUs use 1000W. With $0.13 kWh you're going to pay $3.12 a day or $93.6 a month. The cards together would make very roughly about $5-8 a day before electricity. So yeah, electricity matters a lot. These are just wide estimations, maybe someone with AMD cards could chip in.

It depends on how many spare molex connectors you have from your power supply. If you have enough molex, then use powered risers.

I always used a ASROCK extreme 3 990fx. Never had any problems.
4 x GPU using a riser cable and frame


you SHOULD ALWAYS have a good stable power supply when creating a rig. a good stable power supply will always have enough molex.

I agree with the all powered risers.

Thanks for sharing your thoughts about the electricity costs. For now, I don't have to pay for electricity because I am living with my parents. Until then, I will figure out a way to pay for less electricity in the future.  :D

I agree about having quality power supplies and one important note is to only buy ones with a single 12v rail. Multi rail PSUs very likely won't work.
And of course enough molex and PCI-E 6/8 pins.

This is what I used

http://www.evga.com/Products/Product.aspx?pn=220-P2-1200-X1

I am using the same PSU now in the machine I am posting from over 2 years later, never let me down.

I'm using a couple of the 1300W gold variant (G2) of that PSU in my bigger rigs and love them. Bit pricey but I intend to resell the cards in good condition after it's not profitable to mine with them anymore and the PSUs themselves are pretty good at keeping their resell value and they have a very long warranty.

I think it is definitely worth spending out on though. When you have stable power running through you system it makes a huge difference especially with risers. I think motherboard and power is just as important as the GPU specs.

Good board candidates for 5+ cards are the Asrock H61s/81s (Intel), the MSI Z77A-G45 (Intel), Asrock 970 Extreme4 (AMD), Asus M5A97 (AMD), and Gigabyte GA-990FXA-UD3 (AMD). I used all of these boards in my farm a while back and can do 5+ cards.

  

I have the Asrock H61 and MSI Z77A-GD55 in my mining rigs. They are work well. I would recommend them.

Ah, the MSI Z77A-GD55.  

That's a classic.  I never could get it in stock so i always settled for the -G45.

Excellent board!

GD55 got power and reset button on board, so it is quite handy. G45 is cheaper. It also works very well. The only problem is that you can only have 6 PCIE lanes working.

Those are excellent reviews for the motherboards stated previously. I am evaluating which motherboard shall be the ideal one in terms of price and reliability. I'll first start with one that goes according to my budget, and then I will upgrade to a better one.  :D

Just sot of a question while we're on this topic, I would also like to try GPU mining but would just be using one GPU on my computer, if lets say Ive set it and install cgminer script, can i still use my computer browsing the forum? Too newbie really.

You can mine and browsing the internet without problem. You can use all the GPUs to mine. If you use Google Chrome, you need to disable "hardware acceleration". That will make your browsing more smooth.

I think there should not be a problem now that only the GPU would be doing all the hard work instead of the CPU. You can browse the forums in the computer with no hassles at all.  :)

From experience, Maybe this was just my set up. my rig ran REALLY slow whilst it was mining. Although cgminer / sgminer was not using CPU and CPU showed little activity it was still very slow as I was mining with the same gfx card my monitor was connected to.

Well, first of all, don't mine script.. mine something asic proof..

Second, lots of mobo's have onboard vga. Just use that when mining. If it's disabled, just enable it, it's perfectly possible.

Greetings

You can reduce the mining intensity of the GPU you use for monitor. It depends on the mining algorithm.

The only coin that will use CPU a lot is Ethereum. When you start the Etherminer, it will use the CPU a lot. After the initial set up, CPU usage will reduce.

You better look for AMD motherboards.

You have the military grade type one A
you can get up to 6 GPU's in there.

http://www.ebay.com/bhp/pci-express-3-0-motherboard?_trksid=p2047675.m3443

All the 7 PCIE slots can be used for mining. So You can get up to 7 cards or 8 GPUs if you have dual GPU cards.

I have one question though, if I had to choose the most reliable or durable motherboard, which would be the ideal one that meets this criteria? Gigabyte or Asus Motherboards? In regards to how they look, I love Gigabyte better.  ;D

Do not use the military grade mother boards. They are too expensive.

The mining has very low requirement for the motherboard, so you can choose the lowest spec MB. Any brand will do. You just need more PCIE slots and powered PCIE extension lead.

Exactly. ASRock's Pro BTC boards (H61 & H81) are above and beyond every alternative. You better spend the money on better GPUs or better PSU but these boards are perfect and inexpensive.

True, bit shame that the H61 is EOL :(

I have a few H61 Asrock motherboard, it works very well. I hope H81 is still being produced.

H61 is quite cheap. Unfortunately, it has not been produced for some time.

Given the cost of ANY Intel CPU, I can't see how anyone can recommend Intel-based motherboards for miners.

 Definitely go AMD.

 Gigabite has a new revision of their Gigabyte GA-990FXA-UD3 board out, which is a good thing as the old version had gotten to be a pain to find in stock anywhere for a while.

Because for the price of an UD3 I can get both a H81 and a Pentium G3420.

 Going by Newegg pricing from when you COULD get that CPU, you can get an H81 for less than $20?

 Your CPU *ALONE* costs almost as much as the UD3 motherboard - which is a fairly expensive motherboard by AMD motherboard standards.


 P.S. Newegg lists that motherboard as having been around $60 - but "not available".

I use Intel CPU in the mining is that it is more energy efficient. If I use it for a few years, the saving on electricity is worth the price difference and it has higher sale value.

I'm not from the US but here are the prices available to me:
UD3: $138
G3420: $69
H81 Pro BTC: $66

And they are all in stock (for now).

The H81 Pro BTC looks like it is the cheapest motherboard available so I will give that one a try for my first rig. As long as it is reliable, I have nothing to worry about except installing the GPUs and their USB cable risers. I might set this up on a milk crate, but I think it would be better to buy a custom rig mount (like the ones on Ebay) so I won't need to do all the work of making the holes in the milk crate for the ports of the motherboard.

Take a look at this custom open air frame case for GPU mining rigs, and let me know if it would be a great buy. Link: http://www.ebay.com/itm/KADA-6-1-GPU-Mining-Rig-Open-Air-Frame-Case-Aluminium-Chassis-with-6-USB-Risers-/201058353189?hash=item2ed0030025:g:tvwAAOxyhXRTLk2C (http://www.ebay.com/itm/KADA-6-1-GPU-Mining-Rig-Open-Air-Frame-Case-Aluminium-Chassis-with-6-USB-Risers-/201058353189?hash=item2ed0030025:g:tvwAAOxyhXRTLk2C)

Looks great if you don't mind spending that much on it. I mean it looks great and it's easy to use but it pushes your ROI way back.

I prefer making my own frames with wood similar to this (http://oi41.tinypic.com/2ai0it5.jpg) (not mine) which is dirt cheap and spend the excess on another GPU or better PSU.

Looks great! The only thing is that I don't know much about building frames myself. I rather prefer to buy it fully assembled. Isn't there such a wooden frame where you could buy it prebuilt?  ???

Probably, but I don't know any.
Two things came to mind though; the first being that custom frames like you linked preserve their prices well, so you can resell them anytime. The second thing is that for beginners wood is probably not the best idea because wood is flammable. Granted, you'd need to mess up royally to have it catch on fire but still, it's not unheard of.

 Someone's seripusly gouging you on the UD3 - it's about $110 from Newegg, the H81 is around $60 IIRC for comparison.

H81 is specifically designed for the GPU mining, it is better than any mother board for this purpose. It can support 6 graphics card.

Apparently, the H81 Pro BTC motherboard is Out of Stock from Newegg. I tried looking for it on ebay or Amazon but the price is much expensive. I guess that I will have to wait in order to get one, or maybe buy a similar motherboard with less PCI slots.  :(

Some MSI motherboards have 7 PCIE slots, like G41, G45, GD55 or GD65.  I bought the MSI Z77A GD55 for $160 two years ago. I sold it for $180 a few weeks ago. They are in demand.

Great! I have a look into them and check which one would be suitable to start mining according to my budget. About the ideal power supply for the GPUs, how do I know how many watts PSU do I need for lets say 6 or 7 GPUs? I just want to know since I don't want to waste money on a bigger watt power supply, when I could have bought one that meets the wattage requirements for the GPUs.  :)

If your electricity is more than $0.2/kWh, then do not mine.

If you can buy AMD 7990, that is the best for Ethereum mining in terms of price, performance and power consumption. You might get ROI with this.

With 4x 7990 = 8GPU, so it is best to reduce the overhead cost of the PC system. It also just needs 4 PCIE slot. You can even use a micro ATX motherboard.

For Ethereum mining with h4x7990 and you undervolt and underclock, a 1250W power supply is OK.

Need context to qualify a response, as in: what card(s) you'll be building your rig out on.

Do some digging to find the wattage used by your total cards, plus the CPU and the motherboard itself - then add some reserve capasity just in case, 20% is a good rule of thumb if you have GOOD wattage figures to work with.
 If you're running higher-end cards, figure you're going to probably need more than one PS.

I'm building a GPU rig the next week or so using an old AM1 socket mobo for a few weeks but will most likely be picking up a refurb'd MSI g45 from newegg to replace it. I've had that board in two different machines and never had issues. I'll be putting a Corsair RM1000 to power 2 7990's. Probably the lowest PSU wattage you wanna go if you run two 7990's I may try to get two more and power them with a 1000w HP server PSU that people have been using here to power their bitcoin miners. Look up dogie's guides he has it listed there and its pretty cheap i think $45 on amazon. So hopefully won't have any issues mining on the MSI G45 with 4 sapphire 7990's. Essentially 200 MH/s of mining power on 2000w without being full load. If you're looking for the most efficient card for your money it's gong to be the 7990. .

https://docs.google.com/spreadsheets/d/1s5SaThZ5eOSAiVMpmuIjz-_YjIlcxttAzKuWKAbczds/edit#gid=0 (https://docs.google.com/spreadsheets/d/1s5SaThZ5eOSAiVMpmuIjz-_YjIlcxttAzKuWKAbczds/edit#gid=0)
Look here for a spread sheet the ethereum guys have put together...That's what i'll be mining.

Yeah I'm hoping that underclocking them a tad will help in the not burning department  :) But if they go I will just swap to full 7950s

If you reduce the voltage to 1v or lower, the frequency to 900MHz or lower, the card will last quite long.

Why do you say that?

I have a 7990, running stock at under 70 degree.

Should I be concerned?

Thanks!

Depends on how long you've been running and what kind of quality your PSU is. Depends on what you are mining but things like Ethereum are heavily Memory dependant and not core dependent. You shouldn't lose any hashrate by lowering your core clocks and keeping your mem clocks the same or a little higher. may save you on power usage and lifespan on the card as well.

As always keep your cards COOL. Big fans are a great to help this in open air rigs.

For Ethereum mining, it is OK to keep the memory frequency at 1250 or 1500 MHz, and set the core frequency below 1000MHz.

I would be using AMD cards for my mining rig to mine Ether. I think that with 6 AMD Radeon R9 GPU cards,  I will mine a lot of Ether but that would depend on current mining difficulty. For starting, I will just buy 3 GPUs and see how well it goes for me. Then I would buy more as needed.  ;D

7970 cars are the best to mine. It is cheaper than 280x and has the same structure. You can have ROI if the Ethereum price is kept at 0.005 btc.

I hope ETH price remains stable so that I could ROI fast. Thanks for recommending me this type of GPU to mine. It is indeed cheaper than 280x ones and if it performs the task well, then it would definitely be a keeper for my future mining rigs.  :D

The problem with Ethereum mining is that it will last no more than 10 months. It will become PoS after some time.

I have heard about Ethereum becoming PoS but didn't thought it was going to be in the next 10 months. I guess that I haven't read much about Ethereum's phases yet. One thing I know for sure is that Homestead release is very near. I'd better start building my GPU rig to begin with ETH mining. Later, I will buy some ETH mining hashrate from Genesis Mining and see if I could get ROI as well.  :)

You can ROI on an ethereum rig in 3.5 months right now if you don't go out and buy all new parts. My rig just cost me $900 and will ROI in 110 days. Even less if the price stays like it is now(it will correct itself soon i'm sure). I'm hashing at around 80 MH/s at 950 Watts thats with an underclocked 7990 and two 7950s on an old ass AMD athlon 2 processor+ motherboard I had left over.

Building a second rig almost the same and will have roughly 6 months of profit. Even if PoS comes when they say it will I will have already made $750 in profit per rig. And I can sell those cards on ebay to make back more.

Mining Ethereum may only last 10 months but it's still very much worth it and may provide you the extra cash you need to buy the next gen 16nm ASICs or something else...

Great! Thanks for sharing your experiences mining Ethereum. It certainly looks like a fun task (besides the profit) and will be building my very first ETH mining rig soon. I could also try buying ETH at cheap prices and wait for the price to go back up to profit. That could also work, but I think that it is more risky than mining itself. Since I don't have to worry about electricity costs (for now, until the chance is over) I will definitely make more profit with ETH mining. Also, I wouldn't mind investing in Genesis Mining ETH mining hashrate.  :D

7990 is the best. It is more efficient that 7970 as it removes some duplicated circuit.

The Genesis mining is too expensive. It is price for 1 year mining contact, but you may only mine for 9 months as Eth will change PoW to PoS.

https://blog.ethereum.org/2015/08/04/ethereum-protocol-update-1/

Posted by Stephan Tual on August 4th, 2015.

Difficulty adjustment scheme

A lot of you have been wondering how we would implement a switch from PoW to PoS in time for Serenity. This will be handled by the newly introduced difficulty adjustment scheme, which elegantly guarantees a hard-fork point in the next 16 months.

It works as follow: starting from block 200,000 (very roughly 17 days from now), the difficulty will undergo an exponential increase which will only become noticeable in about a year. At that point (just around the release of the Serenity milestone), we’ll see a significant increase in difficulty which will start pushing the block resolution time upwards.

So, a year on, the network will continue to be useful for roughly 3-4 months, but eventually will reach an ‘Ice Age’ of sorts: the difficulty will simply be too high for anyone to find a block. This will allow us to introduce PoS, perhaps via Casper, if it proves itself.

So the GPU mining can last at most 10 months. I wish it can last longer and distribute the Etherum more evenly.

If the PoS is not ready by then, it will extend the PoW mining. I think PoW mining gives more value to the coin.

PoW costs a lot of money, that money underpins the value of the coin it mines with. I hope PoW can last longer.

I'm right with you mate, otherwise I would have wasted my time buying GPUs to not be able to reach ROI. As long as the PoW phase extends, I will be able to get more ETH and hopefully ROI before the exciting journey of PoS comes in. And I think that once we will get to Homestead, it will be a great sign for the price too.  ;D

I am also giving a look at ETH cloud mining, since it looks very promising. Genesis mining might be a better shot at this for the moment.  :)

The genesis mining is a no go. It is too expensive. The price is $4400 per 100 MH/s. You can build much cheaper rigs.

I use the H61 motherboard. It is very reliable. It will recognise 6 GPU easily. If you have the dual GPU cards, it can support 8 GPU.

H61 is good. Asrock has H97 now.

This is from http://cryptomining-blog.com/page/4/

Intel Socket 1151 ASRock Motherboards
5 cards:
– ASRock B150A-X1
– ASRock B150 Pro4D3
– ASRock B150 Pro43.1
– ASRock H170A-X1
– ASRock H170 Pro4
– ASRock H170 Pro4D3
– ASRock H170 Pro4S
4 cards:
– ASRock B150 Combo
– ASRock B150M Pro4S
– ASRock B150M Pro4
– ASRock Q170M vPro
– ASRock H170 Combo
– ASRock H170M Pro4S
– ASRock H170M Pro4

Intel Socket 1150 ASRock Motherboards
6 cards:
– ASRock H81 Pro BTC
– ASRock H81 Pro-G
– ASRock B85 Anniversary
– ASRock H97 Anniversary
4 cards:
– ASRock H81M BTC
– ASRock H81M-G
– ASRock B85M BTC
– ASRock B85 Pro4
– ASRock H87 Pro4

Intel Socket 1155 ASRock Motherboards
6 cards:
– ASRock H61 Pro BTC
– ASRock H61 Pro
– ASRock H61DEL
4 cards:
– ASRock H67DE3
– ASRock P67 Pro
– ASRock P67 Pro3 SE
– ASRock P75 Pro3

Of that list, the H61 pro BTC is a solid MB.

Hey thanks for this list mate! I was looking for a reference of the best (and affordable) motherboards for GPU mining. Luckily, I already ordered one (H61 Pro BTC) and am planning to get another one to expand my GPU mining setup. It is very cool to mine and watch your profits grow with GPUs like Radeon. I am going to be mining ETH for this.  :)

Nice! Good info.

following

Of those motherboards, the H61 and H81 pro BTC are the most popular. I have good experience with H61.

I have used the H81 pro BTC. It is also pretty good. If I need to expand my mining farm, I will use it again.

The Asrock H81 is good. Does anybody have experience with the latest H97 boards for mining?

Everyone wants to use current gen mobos but that will increase roi time too much.

Ive been researching mobos and im really only interested in lga 775 generation mobo, you can get them much cheaper.  You have to build smaller rigs as they usually only come at most with 1 pcie x16 and 2 pcie x1.  Its challenging to find a proper mobo at the lowest price but I came across the hp compaq 5800 and its a ssf board but this is what ive found.  Plenty of supply online, seems to have normal 775 cpu cooler mount holes, 3 pci-e slots, there is only case fan connection and cpu fan connection is there but connector not soldered to the board.  I have found them for around 12 bucks, core 2 duos cost 2-4 bucks, ram 12 bucks + hdd ~ 20 bucks or so.  So for 50 bucks you could have a 3 gpu rig up and running + psu.  That is IF the cpu cooler will mount on this board but im fairly confident it will, other ssf and desktops use propriety cpu mounting and power connection, hp compaq and dell have done this.  For example my dell ssf gx520 board uses this  propriety cpu cooler, basically it has 2 holes drilled on the board and the cooler is attached to the case and then snaps over the chip.  If that fails get a normal oem 775 board that you know wont dick you around with propriety bs, that will be like 50 bucks or so which is still cheaper than current gen.

Anyway something to kick around

For the old motherboards, there are too few PCIE slots. So you need more CPU, hard disks and memory.

Best mobo is the one you already have. Ugliest ghettorig I have does 150MH ETH with 3 PCIe slots and old amd phenom X2 cpu, 2 x 295x2 + 290. I also have two S775 rigs doing 60MH each, 2x390 and 3x7970.

The old motherboards worked well. But I mainly use the Asrock boards with 6 PCIE slots as I want to use as many cards as possible in my system.

Interesting information. Thanks for sharing this mate. I thought that only new gen motherboards could be used for this task, but now I know that old ones can be used for the same thing as long as it has the required PCI-E slots. Setting up a really cheap GPU mining rig can be really cheap these days.  ;D

here is a free rig
why is that . it was left over from ltc mining before the gridseed asics got hot.

It uses an asrock h77  mobo
an openrig frame
an old seasonic bronze psu
2 4gb sticks of ram
an intel 2500t cpu >  very low power
an old sapphire hd7970 3gb ram
an big ass really good quiet air cooler

http://www.newegg.com/Product/Product.aspx?Item=N82E16835242030R

so I fired it up and I am making coin with it.

of course the siren of more power has called and I added an r7 370 to it.

https://bitcointalk.org/index.php?topic=1429151.0

https://i.imgur.com/Ml4xsNL.jpg

https://i.imgur.com/88nCXXo.jpg

I'm looking to build a small 3 GPU rig using  the following hardware?

1 x Sempron 2650 or 3850
1 x 4GB PC-1333Mhz
1 x Gigabyte GA-AM1M-S2H
1 x 32-60 SSD
3 x EVGA GTX 950  02G-P4-2957-RX
3 x PCIe x1 to x16 risers
1 x 100-B1-0600-KR

This is a side project for my dad so long ROI 6 - 9 months isn't an issue.

anyone know if you can run this many GPU's on an AM1 board and have it see all of them?

That looks pretty sweet. You turned this into a very useful mining rig. The setup looks great and speaking of the affordability of the parts, looks like a great way to build a cheap and effective mining rig. By sharing this, I'm now inspired and ready to build another cool mining rig. Once set up, I will use it to mine ETH and DASH.  :)

Shouldn't be a problem but I'd recommend more RAM. I usually budget the same amount of extra RAM
as the total of all the GPUs. So if those are 4 GB GPUs you should get 16 GB RAM.

Regarding the thread title I couldn't resist...

http://www.supermicro.com/products/motherboard/Xeon/C600/X10DRX.cfm

why the overkill with ram? i'm usually fine with 8 giga of ram i can't see the reason to go nuts with it, they also start to be expensive at 16 gb

 Unfortunately, most of my "old" motherboards are microATX with one PCI-E slot, otherwise they'd probably work well.

The memory size of 4GB is fine. I will use the 1066 memory. If they are not avalilable, I will under clock the 1600MHz to 800MHz.

It mostly depends on the algo you want to mine. You can probably get by with increasing the virtual memory but for
the incremental cost of 4 GB RAM per GPU I think it's worh it. And it's not a step function, shit won't happen when you
cross the line. But if I'm thinking of adding a 3rd GPU to a rig with 8GB RAM I'd also be thinking about more RAM.

It's just a guildeline I follow, not trying to force anyone to agree. I have a couple more:

The CPU should have as many cores as there are GPUs so each GPU has a dedicated CPU core serving it.
A dual core Celeron would be sufficient with 2 GPUs.

And I always use powered risers on PCIE-x1 slots unless it's a board specifically designed for mining with extra power inputs on the bus.

I find these guidelines simple to undertsand for non-techies. Geeks, of course, would do their own engineering and wouldn't
be asking the question in the first place. YMMV.

16 Gig total ram is pretty cheap any more, can find it under $70 on Newegg even pushing faster ram speeds.

 It's probably overkill for current mining, but can be nice to have it for later repurposing of the machine(s).

What is the benefit using 16 GB memory? I thought 4 GB is enough for all the coin mining so far.

there was a coin that was based on ram, not in the sense that you need ram to mine, but it was posible to mine only with big ass memory, like at least 16gb, or even 32

i forgot the name, but it does not matter anymore i think it's dead now...

What is the point of ram mining? I think the hard disk mining can use the unused the hard drive space.

There is already a coin in which you can mine with your hard drive's free space. It is called Burst which is based on NXT. You can check it, although it is not very profitable to mine, but still it is fun. To check out how much you will earn, go here: http://burstcoin.biz/calculator (http://burstcoin.biz/calculator)

was not ram mining, big bench of ram was needed for your mining with cpu with that coin, that i've mentioned

For the mining with big PC memory, most of the home miners will not be able to take part in. We usually have less than 16 GB.

Agree. I also think that I would not be as effective as mining with a GPU or CPU. You would get better performance with a GPU than RAM memory, in my opinion. A good way to bring mining to everyone would be a specialized ASIC mining chip from within a smartphone or tablet. That would be very ideal and would help bring crypto currencies to the masses.  ;D

Yes. But that will deplete the battery very fast. maybe the graphics with the PC is the best way to mine.

For me, I will never use the portable device to mine. That is bad for the battery life and battery costs money.

That is true, but you'll never know when manufacturers start making powerful batteries for these portable mining devices. It will be a matter of better capacity in order to have greater battery life. Perhaps, they decide to make those batteries affordable to buy in the future as I have a feeling that power specs would be greatly improved in smartphones by that time. Just my opinion.  ;D

If anyone needs mobos, hit me up. I have 5 or 6 bitcoin motherboards with intel CPUs from both asrock and biostar. All have 6x PCI-e.

Where are you based? I am in Europe. Maybe the cost of shipping the mother board could be too much.

 They won't. Not worth the cost for a very tiny to non-existant market.

Hi guys. need help. looking for MOB for 2-3 gpus for mining. prefebly 775lga . any advices? any reccomendations?

I reckon you have a LGA775 processor. It is better not to use those now. Their power consumption is high. It is better to buy the 1150 or later CPU. They are cheap.

i got ASROCK H61 Pro BTC with INTEL G640

I actually just purchased Asrock 1151 H170-X with 5 slots, you can easily find it everywhere. TDP for 1151 CPU is also lower.

This motherboard has only one on board molex connectors, different from H81. So be careful when running RX480.

If you use the AMD R9 RX480 for the Ethereum mining, you need a properly configured +12V power supply.

AMD issued a new driver:
http://videocardz.com/62009/amd-releases-radeon-software-crimson-16-7-1-drivers-fixing-power-distribution

There are some issues with that driver as well.