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Author Topic: what is the best rig design, today, for the most mh/s per dollar?  (Read 1672 times)
fcmatt
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August 29, 2011, 03:47:04 AM
 #1

I am basically curious if someone has recently investigated building new rigs and what was the best
they could do mh/s for the dollar?

I realize MBs, ram, cpu, PSU are not really an issue of acquiring what you want of each.. but what I am interested
in knowing if 5830s at $160 is still the best way to go... or perhaps 5970s at $500 a pop?

If you can chime in with what you think is the best way to go, today, I would appreciate it. It would take me hours
to shop around to figure this out.
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Christian Pezza
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August 29, 2011, 04:39:59 AM
 #2

well, thats the trip man! how much $ u have and how much u like to invest on BTC. If u have free watt or if u pay for it!
In the perfect world if u pay watt like u said 5830 sapphire it's the best... MSI or any card if u can get trough all pci to connect and the OS read it well u already design a cool rig

ubuntu, BAMT, Linuxcoin depends how much u know and how much u have to study (suffer)

its almost  personal thing how to design a rig

I mean check this one https://bitcointalk.org/index.php?topic=7216.0 and u will understand what I mean Wink

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fcmatt
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August 29, 2011, 04:51:37 AM
 #3

Maybe I should have mentioned that I do already have about 2600 mh/s running.. and I wanted to keep electricity out of the conversation.
Pure mh/s per dollar is what I am interested in, today. I had this all figured out months ago but I really have no clue today.
I was hoping someone who just did all the work and math could chime in. Otherwise I will have to redo my spreadsheet and visit
every vendor that I trust to gather up prices for vid cards.
Christian Pezza
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August 29, 2011, 05:03:18 AM
 #4

I do this for the last 2 months and try almost everything , 5830 are the best sapphire u can flash it like no others some others prefer 5870 u can OC up to 400 mhash but $ make more sense 5830... the radeon 6000 are more expensive and more power consumption... watt it's a big deal to make decision

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mike678
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August 29, 2011, 05:32:01 AM
 #5

but what I am interested in knowing if 5830s at $160 is still the best way to go... or perhaps 5970s at $500 a pop?
The 5970 is the best way to go if your looking for megahash per square foot otherwise don't bother with it.

A 5830 at 160 is a bad price. You can pick up a new 6870 which is basically the same for ~150. I would not recommend this though.

Your best bet is to wait for a 5830 at less then 130, a 5850 at less then 150 or a 5870 at 190-200.


At the top end of those prices a 5830 gives you 2.54 megahash per dollar. A 5850 gives 2.56 megahash per dollar. A 5870 at 200 will give atleast 2.2 (if its a reference card it would give 2.3)

Another thing you need to remember is the more it costs you for the entire server the more diluted those numbers become. Also keep in mind is sometimes more megahash per server is better then the original megahash per dollar for the card.
fcmatt
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August 29, 2011, 05:52:37 AM
 #6

but what I am interested in knowing if 5830s at $160 is still the best way to go... or perhaps 5970s at $500 a pop?
The 5970 is the best way to go if your looking for megahash per square foot otherwise don't bother with it.

A 5830 at 160 is a bad price. You can pick up a new 6870 which is basically the same for ~150. I would not recommend this though.

Your best bet is to wait for a 5830 at less then 130, a 5850 at less then 150 or a 5870 at 190-200.


At the top end of those prices a 5830 gives you 2.54 megahash per dollar. A 5850 gives 2.56 megahash per dollar. A 5870 at 200 will give atleast 2.2 (if its a reference card it would give 2.3)

Another thing you need to remember is the more it costs you for the entire server the more diluted those numbers become. Also keep in mind is sometimes more megahash per server is better then the original megahash per dollar for the card.


So basically nothing has really changed since I did the math... Except finding the prices you mentioned above being much more difficult.
I guess I was curious if people have given up on finding any quantity of 5830s for less then $130.. and shifted their goals to other cards
in the 6xxx series or what not that have great rebates or have gone on sale recently.

I was pretty amazed how people got excited about 5970s at 500 dollars each. That just seems like 100 bucks too much per card.

I am quickly coming to the conclusion that it is quite risky to keep building more rigs when I think the price of btc will slowly degrade
over the next several months. Hoping it is above 10 dollars consistently might be a poor assumption. Yet the idea still appeals to me
to double up on my existing speed. Hm...

Thanks for the post.
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August 29, 2011, 05:57:47 AM
 #7

I got a 5830 this morning on ebay for $110 shipped. I've watched them this week and they are mostly going for about $140 shipped. Some sellers trying to get $160-$200 are ending with no sales.

I read on the "Pictures of your rigs" thread a recent post that someone with 5970s is replacing them all with 5830s to reduce power costs per MHash. I think they're still likely the best choice but almost impossible to find new. Lots of people are getting out and selling their used ones though - if that works for you.

I wish the BTC price would stay up because I love messing around with building systems with 4-5 cards. Be a shame to lose money doing it.

I've been looking at luxRender as another use for them. It supports using GPUs to speed up 3d rendering... makes me want to create a movie just to use the video cards!

BTW there is an fpga card being sold now. It's still costly but is expected to drop as time goes on. It's getting about 100 MH/s on 5 Watts power. So if you kept an eye on those you may have a better long term choice. See the "goods" section in the forum marketplace.

fcmatt
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August 29, 2011, 06:09:48 AM
 #8

Yer, I saw the FPGA thread(s). The amount of time it would take to pay off that purchase is ridiculous.
If I remember correctly or if it was even announced is that the 100 mh/s would cost like 500 dollars.
Even if it only uses 5 watts it is, to me personally, retarded to even consider using to make money.
Unless you can get the stuff yourself for a lot less and build it yourself.. i don't get the attraction
when making money is the name of the game.

And we all know that any ASIC plan was just day dreaming except for skilled people like Art Forz who
even admits his ASIC rigs were expensive and probably done more as a hobby then an attempt to make
a reasonable ROI in a reasonable time.

I guess going used is the best way to go. Buy rigs that contain two 5830s for 400 bucks or what not.
mike678
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August 29, 2011, 02:19:26 PM
 #9

and shifted their goals to other cards in the 6xxx series or what not that have great rebates or have gone on sale recently.
Until we see a 20% drop in the 6xxx costs they will not be competitive with 5xxx cards. My hope is that when the 7xxx series is released that's when we will see this 20% drop. If it happens then there would a lot of effective cards that are easy to get on the market.
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August 30, 2011, 02:41:02 AM
 #10

i think this is pretty much the best:

6x 5830 (6x $130)
MSI 890fxa-gd70 ($180)
sempron 140 ($40)
2gb memory ($20)
flash drive/HD ($10)
2x 700w PSU (2x $70)
6x pci-e risers (6x $15)

total: ~$1260

with each card at around 300mh/s, you'll get 1.43mhs/dollar. this is with brand new parts, but it really depends on your overclocks and if you can get deals on the parts.

mike678
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August 30, 2011, 02:54:33 AM
 #11

i think this is pretty much the best:

6x 5830 (6x $130)
MSI 890fxa-gd70 ($180)
sempron 140 ($40)
2gb memory ($20)
flash drive/HD ($10)
2x 700w PSU (2x $70)
6x pci-e risers (6x $15)

total: ~$1260

with each card at around 300mh/s, you'll get 1.43mhs/dollar. this is with brand new parts, but it really depends on your overclocks and if you can get deals on the parts.
For this to be a realistic build you would need to include some sort of case set up. I couldn't imagine any one being able to build a case for less then 30-40 bucks. Also with two psu's wouldn't you need a dual psu 24-Pin Adapter Cable? That adds a total of 66 dollars between the two items.

In an open case set up you can easily get about 325 from each card with low temps.
The total in this case would be 1,326 and gives you a megahash per dollar of 1.47 which is a bit more accurate Wink

When using new parts I don't think anyone has breached the 1.5 barrier. In the past some one (I think deslok?) mentioned getting ~2.25 but that was with extreme scavenging.
Christian Pezza
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August 30, 2011, 02:55:36 AM
 #12

i think this is pretty much the best:

6x 5830 (6x $130)
MSI 890fxa-gd70 ($180)
sempron 140 ($40)
2gb memory ($20)
flash drive/HD ($10)
2x 700w PSU (2x $70)
6x pci-e risers (6x $15)

total: ~$1260

with each card at around 300mh/s, you'll get 1.43mhs/dollar. this is with brand new parts, but it really depends on your overclocks and if you can get deals on the parts.

how u make to see 6 gpu on the msi? what OS are u work with?

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mike678
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August 30, 2011, 03:00:30 AM
 #13

Turns out I have an amazing memory lol

It's no promise of 3MH /$1 per single rig, but per card it is.
Is it even possible to get over 2MH/$1 per rig? I've done a lot of theoretical builds and if you want any realistic build it usually tops out around 1.5 megahash per dollar.

mine is in the mail already, it was like 145 and 15 bucks shipping
The 5 I got come Wednesday Cheesy

yes it is although it might not be possible building from new. I purchased an old tower on CL for 45 and 2x5770 for 150 it's running at 440mh/s for the past few days so i've managed 2.25mh/$
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August 31, 2011, 11:33:47 PM
 #14

Don't forget about 5770's. ~$100 card, ~108w under load, ~230mh/s.

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August 31, 2011, 11:39:31 PM
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and shifted their goals to other cards in the 6xxx series or what not that have great rebates or have gone on sale recently.
Until we see a 20% drop in the 6xxx costs they will not be competitive with 5xxx cards. My hope is that when the 7xxx series is released that's when we will see this 20% drop. If it happens then there would a lot of effective cards that are easy to get on the market.

Also its been reported that "doubling the stream processors on the 7000 series is a conservative estimate", which from what I understand (i may be wrong), thats one of measures of how many hashes you can get out of a card. So we could see mid-level single gpu cards at 1600+, with high end double gpu cards at 6000+.  That'd be a game changer.

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pennytrader
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September 01, 2011, 12:09:55 AM
 #16

The best rig is no rig today. Wait for the price to fall and buy with cash

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Swishercutter
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September 01, 2011, 12:38:34 AM
 #17

i think this is pretty much the best:

6x 5830 (6x $130)
MSI 890fxa-gd70 ($180)
sempron 140 ($40)
2gb memory ($20)
flash drive/HD ($10)
2x 700w PSU (2x $70)
6x pci-e risers (6x $15)

total: ~$1260

with each card at around 300mh/s, you'll get 1.43mhs/dollar. this is with brand new parts, but it really depends on your overclocks and if you can get deals on the parts.

how u make to see 6 gpu on the msi? what OS are u work with?

I have 5 in each of mine...if I had the 1x extender I don't see why it wouldn't run the 6th.  1.7/1.8 drivers support up to 8 cards...plus no dongles.
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