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1044
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Bitcoin / Mining support / Re: Display driver stopped responding and has recovered
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on: January 21, 2013, 12:05:32 AM
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I had problems with 2 separate rigs with 8 GPU's each. The first one, powered by a rosewill lightning 1300w, with 4 5970's had intermittent red light of death underneath the 5970, signalling bad power or pwm. I redid the cabling, giving each 8 pin pci power their own dedicated plug and the remaining 4 6 pin came from the remaining 2 available 6 pin power plugs; I used 2 of these http://www.newegg.com/Product/Product.aspx?Item=N82E16812198018 to split those into 4 6 pins. Havent had any problems since. Motherboard Asrock 890gx extreme4 with Athlon II x2 250. The other rig, also with 8 gpu (4 5870, 2 5970) could not reliably power more than 6 GPU's. It was powered by a PC Power & Cooling 1KW-SR (1000 watt continuous). Unfortunately by todays power standards, it gets pretty bad voltage droop under high loads, so sometimes I would get driver crashes or complete system freezes. I've since replaced it with an OCZ ZX 1250 watt. No problems since, and much better power efficiency, about 970 watts with all gpu's at 1v. Doing 2.99 Ghash. MOtherboard msi z77a-g45 with celeron g530. Also a more simpler option is, as stated before, is "overclock less, cool more". I run 100% fan and 1v on all rigs, so I'm limited by ambient air and quality of gpu cores. If I get a driver crash, I decrease core speed by 5 MHz. I keep doing that until it stabilizes and I forget about it. All rigs have 2gb budget ram, run off 250v ac power, windows 7 x64, using ultravnc for remote control, bfgminer 2.9.5, driver 11.12, sdk 2.1 installed on top of whatever sdk comes with 11.12. I use "gpu-platform" : 1 in my conf file to select my 2.1 sdk. Hope I was able to help you out. |
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1045
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Other / CPU/GPU Bitcoin mining hardware / Re: [Guide] How to underclocking memory by using MSI AB automatically at startup.
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on: January 20, 2013, 01:25:06 AM
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This should be pretty common knowledge for anyone on windows, but it should be noted that the men clock is still important to some degree. With my 5850s, if I set men to below 500, I started losing MH/s. I've seen people clock it pretty low, which is fine, but just be aware that it's possible to lose some efficiency if not careful.
You must be running bad SDK (2.6 or higher). My memory speeds vary and is usually about (core speed * 0.22)-10 for my 5850 and (core speed * 0.1985)+1 for my 5870 and 5970. Works great, get 347.7 mhash from a 5970 core @ 750 MHz, 481 mhash from a 5870 core @ 1035 mhz, and 328 mhash from a 5850 core @ 785 MHz |
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1052
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Economy / Computer hardware / Re: [WTS] 5870 + CORSAIR 650W PSU
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on: January 16, 2013, 06:54:36 AM
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Gigabyte. Voltage is locked as far as I know if it's anything like their 5850. Bad for mining efficiency, have to overclock it to get any worth out of it. If you have free electricity though, then overclock away anyways. |
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1055
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Bitcoin / Mining support / Re: Submerge your rigs in liquid
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on: January 11, 2013, 11:05:45 AM
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Also a great way to turn the resale value of your hardware to $0. Nobody wants a nasty greasy piece of computer hardware, plus it will alienate 99% of people who would have been interested in a non-greasy hardware. They'll think it's ruined and short circuited.
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