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So I've had 2 of these cards (newegg, 7950 Dual-x 3L, 11196-19-20G), and both are the same.

Only with the alternate bios selected (2nd bios, blue button pushed on and shining, the 925mhz@1.169v one, not the 925mhz@1.25v) can you change the voltage, and only with modded 4.4 - as in, it'll show up in hwinfo, gpu-z, etc as changed voltage values. Not with unofficial ab, not trixx 4.4, not trixx 4.6.

So I've done a TON of playing around, and I'm starting to come to the conclusion that you can't actually change voltage on these cards. hear me out:

- So temps seem to rise if you increase voltage, regardless of profile or what you use to do it. At first I thought maybe voltage was always being changed...

- I can do 1083mhz@1.169v on this card
- I can do 1068mhz@1.169v on last card

On either card, even at 1.25, 1.3v, I can't do 1100mhz, and both seem just as unstable (ie errors around the same time frames).

On stock settings of the stock profile of 925mhz@1.25v, I hit 72*C after about 3 minutes of stress testing in an air conditioned room. This is similar on both cards (dont tell me 'omg that's so hot, I only hit 59*C' because gaming isn't going to get nearly as hot as a stress test). So it's possible I'm hitting a heat wall... but I don't think so, ie I crash even before hitting 70*C on stress testing, etc.

So what do you think? Any testing I could run to verify this? I'm starting to think the card is simply voltage locked, and the voltages it does report, are inaccurate. I've tried playing aroudn on different BIOS - ie I hit 1083mhz@1.169v on the 2nd bios, what about on the 1.25v bios? Same overclock....

it's all very weird. Maybe it's just how 7950s are, they are sweet spot cards and dont budge or something? Is anyone else gets these kinds of results, or what?
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Build In Progress
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CPUMotherboardGraphicsRAM
Haswell i7-4770K 4.8GHz@1.452v/1.97vRIN Gigabyte Z87X-UD3H Older Gigabyte 7950 (H60 Mod) 2x4GB Gskill 2400CL11 Hynix CFRs 
Hard DriveCoolingOSMonitor
Samsung 830 128gb Corsair H110 w/4x 140mm Yate Loon High Blues W7 x64 Ultimate Yarrgh Matey Dell U2312HM Matte IPS 1080p 
MonitorMonitorKeyboardPower
Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
CaseMouseMouse PadAudio
Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
Other
Bitfenix Recon Fan Controller Moded 
CPUMotherboardGraphicsRAM
Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
Hard DriveCoolingCoolingCooling
Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
OSMonitorMonitorKeyboard
Hax'd W7 Ultimate 64-bit Sanyo DP19640 19'' KDS Radius Rad-7xp 17'' Ducky 1087 MX Brown 10keyless 
PowerCaseMouseMouse Pad
Rosewill Capstone 550w Modular NZXT Source 210 w/Modded Window Razer Deathadder 3.5G Steelseries Blizzcon D3 
AudioAudioOtherOther
Phillips FW-C250 2 Speaker Set w/3 CD Changer JBL Sub 6 Subwoofer NZXT Sleeved LED Strip 1m Blue NZXT Sentry 2 Fan Controller 
Other
Colonial Blue Paracord Sleeving 
CPUMotherboardGraphicsRAM
Phenom ii X4 955C2, $31, 5 broken pins, works! ... Biostar A770e3 6.3 Red&Black MSI GTX 460 768mb Twin Frozr II 2 x 2GB Kingston HyperX 1333 OC to 1348CL7@1.65v 
Hard DriveCoolingCoolingCooling
Intel X25-M G2 80GB SSD NH-D14 SE2011 6 x Case Fans (4 x YL-M, NZXT case fan, CM Hype... Jerryrigged Chipset-Northbridge 80mm HSF 
CoolingOSMonitorKeyboard
Jerryrigged VRM Heatsink (sawed off stock AM2 h... Hax'd W7 Ultimate 64bit Sanyo DP19640 19"1360x768 Ducky Cherry Browns 10keyless 
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Antec Earthwatts 430D NZXT Gamma Steelseries Kinzu Optical Steelseries Blizzcon Diablo 3 
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