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61  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [ANN][DOGE] Dogecoin - very currency many coin - v1.4 Released MANDATORY UPDATE on: January 22, 2014, 12:02:42 AM

What happened to http://doge.scryptpools.com/ ?

I mined a load of Dogecoin on that pool a good while back, but looks like the site has closed down? Is there anyway to get the coins I had on the site back?
62  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 16, 2014, 07:32:05 PM
You'll likely need to make your own cable, if you can't find one to order by google searching I won't be able to either. It will be propitiatory to that power supply, so it doesn't have a name.

Either that or run the cards off sata to pci-e adapters. This will probably be the quickest way to get set up. I'd then go on digikey, find a mate to that mini-fit jr. connector on the PSU, then make your own pigtail using the pci-e plugs salvaged from the sata to pci-e adapters you bought. That's kind of unnecessary and exceptionally hard to explain though, I still don't really know how I cruise datasheets like I do...

http://www.amazon.com/Branded-8inch-15pin-Express-Power/dp/B005NJXY7O

Or, you'll get lucky and the cards will come with sata to pci-e adapters! I don't trust the 4 pin molex ones...

Good news!

I emailed Be Quite last night asking if I can get that cable anywhere. They emailed me this morning asking me for my address. Said they will post me one free!

I also connected that single rail switch as well. Didnt even know about it till yesterday. I have learned alot from this thread!
63  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 15, 2014, 08:05:13 PM
You'll likely need to make your own cable, if you can't find one to order by google searching I won't be able to either. It will be propitiatory to that power supply, so it doesn't have a name.

Either that or run the cards off sata to pci-e adapters. This will probably be the quickest way to get set up. I'd then go on digikey, find a mate to that mini-fit jr. connector on the PSU, then make your own pigtail using the pci-e plugs salvaged from the sata to pci-e adapters you bought. That's kind of unnecessary and exceptionally hard to explain though, I still don't really know how I cruise datasheets like I do...

http://www.amazon.com/Branded-8inch-15pin-Express-Power/dp/B005NJXY7O

Or, you'll get lucky and the cards will come with sata to pci-e adapters! I don't trust the 4 pin molex ones...

Thanks again for the advice.

Yeah, its fairly awkward for me to undertand. Seems like alot of effort. If only I could have found that cable online. (Much easier) I made a post in the support forums for that PSU as well, just to see if there is anywhere online I can purchase one of them cables.

If not I will do it the way you mentioned.

64  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 15, 2014, 06:39:25 PM

A graphics card not only needs wattage, but amperage. For example, a 7970 is ~250W in a perfect world. That equates to ~21A of power.

Some cheaper power supplies will "sum" the total amperage of several smaller rails to come up with the total wattage available. For example, a 1200W power supply with 6 12V rails is really 6 200W power supplies. You see?

The problem is that for your 850W supply with 4 rails, you've only got 850W/12V = 70A/4 = 17.5A, so you only have 4 17.5A power supplies!!

A 7970 eats 20A in one bite, and if any single rail of your power supply is ever overloaded the whole thing comes crashing down. No single rail on that PSU will run a 7970, it just won't happen. You could divide the 7970 to 2 12V rails, but then you only have two 17A rails left for the PC and two more cards. I don't see that working! One rail with the PC and card (7950) will be too close to max and crash everything. If you had a single rail PSU you would be able to more effectively utilize the amperage available.

So, a multirail PSU is not preferred as it is sometimes not possible to evenly load the individual rails which will cause the PSU to crash. Otherwise, it is perfectly OK.

Hey,

I just figured out my PSU has an option to switch from multi to single rail.

"the white socket labeled OCK is used to set the power supply to either single or multi +12V rail mode. With nothing connected, the power supply will operate in multi-rail mode (+12V1, +12V2, +12V3 and +12V4). Plugging in the small jumper or connecting the PCI bracket mounted switch (and turning it on) will disable the individual +12V rail OCP circuits and enable single rail mode.

I havent touched it yet though.

Also I need some help figuring out how to connect the 3rd GPU which arrrives tomorrow.

Here is the connections on the back of my PSU.




I only have cables for two of the PCI-E slots. Each cable has a 8 + 6 pin coming from it into the GPU.

However, I am unsure of what type of cable this is. If someone could give me the name of it or link me where to buy one that be great as I need one for the third slot. I have another thread on here about this as well. Heoping to have everything sorted by tomorrow night.

Thanks.




65  Other / CPU/GPU Bitcoin mining hardware / Need help! Were to get a PCI-E PSU connector for this PSU? on: January 15, 2014, 06:15:42 PM

Hi,

I have a Be Quiet Dark Power 850w PSU. I currenty have 2 GPU's connected to it and want to add a 3rd. The PSU has 3 PCIE slots. However there was no connectors for the 3rd slot. The 2 PCI-e slots on it at the minute each have a 8 pin and 6 pin coming out and into the GPU's.

I need to get another one for the 3rd slot but cant seem to find any online. If someone could link me to a site to buy them (UK) or even tell me the name of the cable I have to get, I would really appreciate it. I have a new GPU arriving tomorrow and would really like to get it connected up.

Here is an image of the connections on it.





66  Economy / Computer hardware / Re: 2 HD 6950's (6970 Bios switch) MSI + Sapphire UK Only on: January 14, 2014, 08:29:18 AM

Sorry, just UK at the moment.
67  Economy / Computer hardware / Re: 2 HD 6950's (6970 Bios switch) MSI + Sapphire UK Only on: January 14, 2014, 07:23:27 AM
Hi, I'm in London - can you please state what hashrates you are getting for each card?
Thanks

Hi,

I use guiminer, and run both cards at an intensity of 17. I am getting 430khash on each. However if you put the intensity up to 20. Then you will get a higher khash. I just dont like putting cards under to much load.

When I get home from work tonight I will put the intensity up higher to see what he higest hashrates are and will take a pic.

Im pretty sure you can get 460 - 470 though.

Thanks.



68  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 14, 2014, 07:19:44 AM
I had 3x7970@1040/1500 + sempron145 powered by OCZ 850W Gold.  It takes 910W from the wall, working fine for 6+ months but last time change PSU to EVGA 1000W.
BeQuiet is good brand but there is 1 problem with that PSU. It has 4 12V line , better search for PSU with 1 12V line.

Whats the difference between a 4 12V line and a 1 12V line? Sorry, I just have no idea when it comes to PSU's!



A graphics card not only needs wattage, but amperage. For example, a 7970 is ~250W in a perfect world. That equates to ~21A of power.

Some cheaper power supplies will "sum" the total amperage of several smaller rails to come up with the total wattage available. For example, a 1200W power supply with 6 12V rails is really 6 200W power supplies. You see?

The problem is that for your 850W supply with 4 rails, you've only got 850W/12V = 70A/4 = 17.5A, so you only have 4 17.5A power supplies!!

A 7970 eats 20A in one bite, and if any single rail of your power supply is ever overloaded the whole thing comes crashing down. No single rail on that PSU will run a 7970, it just won't happen. You could divide the 7970 to 2 12V rails, but then you only have two 17A rails left for the PC and two more cards. I don't see that working! One rail with the PC and card (7950) will be too close to max and crash everything. If you had a single rail PSU you would be able to more effectively utilize the amperage available.

So, a multirail PSU is not preferred as it is sometimes not possible to evenly load the individual rails which will cause the PSU to crash. Otherwise, it is perfectly OK.

Hey,

Thanks alot. This post was extremley informative and helpful. I know what to look for when I get my next PSU now!

Cheers.
69  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 13, 2014, 09:22:08 PM
I tried to run 3x Sapphire 7950 Dual-X's (overclocked) off a Seasonic 860w platinum power supply. It worked, but my kill-a-watt meter was showing 1050W drawn from the wall. At 89% efficiency, an 860w power supply shouldn't pull more than about 955W from the wall at maximum load. 100 watts over spec was a bit much for my tastes, so I switched to an EVGA SuperNOVA 1000W P2. I've also killed a 450W no-name power supply with just a single Sapphire 7950 overclocked (ran fine for days, power cycled and it wouldn't turn back on ever again). So it's important to have enough power to run your cards. A fried power supply isn't fun to deal with.

Thanks for the post. I was actually running a 7950 on a 425w PSU a well. Worked fine. Have since put that 7950 into my rig and have a 6950 on my 425w now.
70  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 13, 2014, 09:20:13 PM
I had 3x7970@1040/1500 + sempron145 powered by OCZ 850W Gold.  It takes 910W from the wall, working fine for 6+ months but last time change PSU to EVGA 1000W.
BeQuiet is good brand but there is 1 problem with that PSU. It has 4 12V line , better search for PSU with 1 12V line.

Whats the difference between a 4 12V line and a 1 12V line? Sorry, I just have no idea when it comes to PSU's!

71  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 13, 2014, 08:52:24 PM
It's pushing it, especially when overclocked. My Corsair 850 handles 2 7950s overclocked but I had to down clock them to add a 7850

Thanks, thats good to know.

72  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 13, 2014, 07:33:45 PM
In stock or optimal clock settings/volts, no. I highly doubt it. Especially not on that power supply, I've never heard of that brand.

Can it be done, yes. With some tweaking, undervolting, and possible underclock.

Should it be done? Probably not.

Can you just buy an extra 300-400W power supply for ~$20 and use it to run the new card? Or, use a cheap power supply to power the motherboard, then use all 850W to power the cards. I'd stay away from the 7970, still.

Don't use molex to pci-e power adapters!

Thanks for the reply and advice.

Here is the PSU,

http://www.bequiet.com/en/powersupply/212

I was told it was a good brand, but I know nothing about them.

So you reckon 2 7950's and 1 7970 is a bad idea? If so, what about 2 7950's and 1 6950?

Thanks.



73  Economy / Computer hardware / Re: 2 HD 6950's (6970 Bios switch) MSI + Sapphire UK Only on: January 13, 2014, 06:17:34 PM
Would you ship to the US?

Hi,

At the minute it is UK only, but I will let you know if I change my mind.

Thanks.
74  Economy / Digital goods / Re: [WTS] Steam Codes $20 : Tomb Raider, Just Cause 2, Hitman BM, Dungeon Seige on: January 13, 2014, 04:28:09 PM

Bump, prices lowered.
75  Economy / Computer hardware / 2 HD 6950's (6970 Bios switch) MSI + Sapphire UK Only on: January 13, 2014, 02:26:13 PM

Hi,

I am selling 2 HD 6950's which have been unlocked to 6970's using the cards bios switch. I have been minning for 2 weeks on the Sapphire, and just a few days on the MSI. I just use the MSI on my home gaming PC. The Sapphire is in my minning rig.

Looking for 115 each for the cards. Payment via UKBT or BTC.



Any questions just ask. Selling as I have just bought a 7950 and may be buying a 7970 as well.

Thanks.
76  Other / CPU/GPU Bitcoin mining hardware / Re: 3 7950's on a 850w PSU? on: January 13, 2014, 01:40:57 PM
I had 3 on a Corsair 850.  The temps were too high, but it did handle 3.

Thanks.

What about overclocking them. Will the PSU still hold up then? As I read overclocking increases watts.

77  Other / CPU/GPU Bitcoin mining hardware / 3 7950's on a 850w PSU? on: January 13, 2014, 01:30:02 PM

Hi,

Im just wondering if it is possible to run 3 7950's or 7970's on a 850w PSU. The PSU is a 850w Be Quiet Dark Power Pro gold.

Im thinking about buying a 3rd GPU for my rig, but am unsure if the 850w will be able to handle 3 of them.

Any advice would be great.

Thanks.
78  Economy / Computer hardware / Re: Sapphire Radeon HD 7950 Dual-X OC 3GB - Short Auction!!!! on: January 09, 2014, 05:13:38 AM

$180 delivered to UK.
79  Economy / Digital goods / Re: [WTS] Steam Codes BTC/LTC : Tomb Raider, Just Cause 2, Hitman BM, Dungeon Seige on: January 09, 2014, 01:07:49 AM

Bump, accepting LTC now.
80  Economy / Digital goods / Re: [WTS] Steam Codes : Tomb Raider, Just Cause 2, Hitman Blood Money, Dungeon Seige on: January 06, 2014, 09:46:27 PM

Still available. I will only send the codes to you first if we are using an escrow or you have high trust on here.

Have been getting scammers pming me looking to send first without escrow.
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