Title: HD7950 Crossifre very low Intensity / Massive HW errors above -I 13 Post by: mgoldfinger on December 05, 2013, 10:33:15 AM Need some help here. I was previously running a rig with HD 6950 at a nicely tweaked level of about 500K/hs. I now build a new rig with the following specs:
- 2 x XFX HD7950 Double Dissipation (FX-795A-TDFC) - MSI Z87-G45 Gaming,s1150 - Intel Core i3-4130,s1150 - 1 x TNAV6R00 Corsair RM1000 (Gold standard) - ICIDU Value DDR3 1333-2GB (2x4GB) - Windows 7 Home Premium 64Bit All new hardware. Using CGMiner 3.7.2. for scrypt mining Did a clean install of Windows 7. After I installed all the latest AMD drivers, I input setx GPU_MAX_ALLOC_PERCENT 100 and I start cgminer I get massive HV issues when trying to increase the intensity above 12! currently running at stock with 900/1250 settings for GPU/RAM. Voltage is untouched. Both GPUs are found by CGminer and both have this issue. I have tried: 1 CGMiner settings, adjusting –G, -W, --Thead Concurrency (8192 is the max I can run without adjusting the lookup-gap) --Lookup-gap, blank settings (I then get intensity 8 ???) 2 Various AMD/catalyst drivers 3 Varios CGMiner versions < 3.7.2 4 Run a single card, instead of crossfire. 5 Disabling crossfire, run both cards 6 Disabled performance tuning in the Catalyst software 7 Swapped the system RAM 8 mine a different pools / different Scrypt cons I have found posts with similar problems, but none of the solutions seem to work for me. I also have the feeling that CGminer settings is not the issue here. More like a conflict somewhere happening in the rig? Any ideas? did you also have this issue, and how did you solve it? Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 12 Post by: motd2k on December 05, 2013, 11:10:20 AM I have a very similar setup (with a 3rd 7950) and have them tweaked to produce around 650KH/s with this config:
Code: "auto-fan" : true, These hash rates were fairly consistent between Windows, Debian, and BAMT installations. Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 12 Post by: mgoldfinger on December 05, 2013, 11:27:49 AM I have a very similar setup (with a 3rd 7950) and have them tweaked to produce around 650KH/s with this config: Code: "auto-fan" : true, These hash rates were fairly consistent between Windows, Debian, and BAMT installations. thanks, will try. Did you initially have similair problems like I am having? Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 12 Post by: mgoldfinger on December 05, 2013, 03:38:50 PM I have a very similar setup (with a 3rd 7950) and have them tweaked to produce around 650KH/s with this config: Code: "auto-fan" : true, These hash rates were fairly consistent between Windows, Debian, and BAMT installations. not working i am afraid. still can't get intensity above 13..... Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 12 Post by: mgoldfinger on December 05, 2013, 05:19:49 PM I think i am zooming in on the problem, but i have no idea how to solve it / what is actually causing it?
I noticed stability is very much dependent on thread concurrency , in my setup I can not get thread concurrency above 8192 (this should be way to low for a 7950??), without changing the lookup gap. @gap 2 i can run stable on intensity 13 @ 8192 concurrency. lowering concurrency results in HW errors @ I 13, gap 2 If i change lookup gap to 3, i can blast intensity to 19/20. However, performance is then gone.... +/-650 khz combined (remember i run a crosffire setup). really getting stuck here...... Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 13 Post by: mgoldfinger on December 23, 2013, 08:10:02 PM FYI: solved.
Flashed the bios on the card using VBE7, which got me down to 1.080V and removed boost Reinstalled windows and can now reach TC>40000 (which is pointless btw) Tweaked the clocks and can now hash at +/-660 per card with GPU/RAM 1120/1500, stable and all. btw. http://www.holynerdvana.com/2013/12/finding-optimal-clock-speed-for-cgminer.html great tool (credits to the developer)! Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 13 Post by: sc2btc on January 03, 2014, 05:25:15 AM mgoldfinger, would you be able to disclose what BIOS you've flashed too and/or where you obtained it?
I found this thread after Googling a bit and I'm having the exact same problem: fresh build, fresh Win7 64 install, (single) XFX HD 7950 DD has ever increasing HW failures at difficulty 13+ (it also rises in temperature pretty quickly after as well). Everything is stock. I've yet to toy with TC values. GPU-Z lists the current BIOS as 015.024.000.001.000000 Glad you got yours working! Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 13 Post by: andycee on January 03, 2014, 09:05:05 AM TBH, I found it was way easier to let CG Miner decide its own Thread Concurrency on multiple card setups. I leave it out of the .conf file and get 650Kh/s every time, with minimal tweaking on my Gigabyte 7950's.
Title: Re: HD7950 Crossifre very low Intensity / Massive HW errors above -I 13 Post by: 6Fallen on January 03, 2014, 05:26:40 PM you need a new rig thought
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