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AMD Radeon HD 7950 XFIRE

post #1 of 7
Thread Starter 
Hey everyone, I've just bought a second 7950 for my rig. However, it won't arrive for a few days and I'm far too impatient to find these things out for myself. Also, I'd rather know before I open the box of my second 7950 if these problems still exist so I can return it. Once it arrives, I'll do some benchmarks to help other people. Anyway;

I've seen a lot of threads comparing XFIRE 7950's to Titans and 780s and such. As far as I've found, these have all been months ago before drivers were fixed (I think), and none of them had really clear answers. Some just got into flame wars. So I was wondering; Does anyone have any benchmarks or relative proof of how XFIRE 7950's compare to other high end cars? Eg. Titan, 690, 7990, etc.
Also, I was curious as to if the recent driver updates have fixed the micro stuttering problem that I've heard so much about. According to these old threads, it was meant to be fixed in July, but I'd rather have some more recent info. Also, scaling would be nice to know as well.

As I said before, once I get my second 7950 and chuck it into my rig, I'll report any problems I have and post some benchmarks. Until then, I'm curious as to what other people have experienced.

Thanks,

Sprtn.
post #2 of 7
Recent frame pacing drivers (13.8 beta 1&2 as well as the new 13.10 beta) have significantly improved frame intervals for any 5000 series or higher Crossfire setup in DX10/11 titles (DX9 and OGL fixes are still coming). Provided you aren't CPU limited, scaling is typically quite good as well.

In general dual 7950s will match or beat a 780/Titan.

There are still some driver/CFX issues, but most of these are quite manageable.
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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
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post #3 of 7
Thread Starter 
Thanks for the reply smile.gif

Also, I was looking to overclock my 7950(s). I've heard different people say different things, so I'm not sure on what to do at this point:

For me to achieve my 1100/1575 OC, I need to increase the voltages. I'm not doing this manually, I'm doing this with CCC. I was wondering; If my GPU stays at the same temp (which it will, because my fan is at 30% and it's only 40C), will increasing that voltage do any damage or shorten the lifespan? Or is that only if the GPU gets hot?
post #4 of 7
More voltage at the same temperature and clocks will decrease lifespan. Higher clocks, even at the same voltage and temperature, will decrease lifespan. Higher temperature, even at the same clocks and voltages, will decrease lifespan. Often, all three are increased when OCing.

Still, as long as you don't go crazy and keep yourself within reasonable limits, chances are that you'll be replacing the cards long before they fail or seriously degrade.
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Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.05) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Cooler Master Nepton 280L 
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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
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X5670 Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 1600MT/s 7-8-8-19-T1,... 
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post #5 of 7
Thread Starter 
Would you say that going from 900/1250/0% to 1100/1575/20% (Core clock, memory clock, power control settings) is too crazy, or would that be reasonable? It's the maximum allowed through the Catalyst Control Center. Also, I plan on keeping these cards for another 2-3 years optimally. Would they last running like that? They would be at around 50-60C on load usually.
post #6 of 7
I wouldn't anticipate any issues under gaming uses, though 24/7 folding or hashing might require you do back off a bit. Also, you should keep track of VRM temps as well as core.
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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 CM Storm Spawn Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 1600MT/s 7-8-8-19-T1,... 
RAMHard DriveHard DriveHard Drive
1x Crucial BLT4G3D1608ET3LX0 @ 1600MT/s 7-8-8-1... OCZ (Toshiba) Trion 150 120GB Hitachi Deskstar 7k1000.C 1TB 2x Seagate 7200.10 RAID 0 
CoolingOSPowerCase
Prolimatech Genesis + 2x140mm Cougar 1200rpm Windows Server 2008 R2 Antec TP-750 Antec P182 
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ASUS Xonar DS 
CPUMotherboardGraphicsRAM
FX-9590 @ 5GHz, 1.55v ASUS Sabertooth 990FX R2.0 Reference NVIDIA GTX 780 2x8GiB G.Skill DDR3-1866 10-11-10-30-T1, 1.5v 
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CPUMotherboardGraphicsRAM
5820K @ 4.3GHz, 1.225v Gigabyte X99 SOC Champion (F4m) 2x Sapphire R9 290X Tri-X OC New Edition (10036... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.35v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.05) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Cooler Master Nepton 280L 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 CM Storm Spawn Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 1600MT/s 7-8-8-19-T1,... 
RAMHard DriveHard DriveHard Drive
1x Crucial BLT4G3D1608ET3LX0 @ 1600MT/s 7-8-8-1... OCZ (Toshiba) Trion 150 120GB Hitachi Deskstar 7k1000.C 1TB 2x Seagate 7200.10 RAID 0 
CoolingOSPowerCase
Prolimatech Genesis + 2x140mm Cougar 1200rpm Windows Server 2008 R2 Antec TP-750 Antec P182 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
FX-9590 @ 5GHz, 1.55v ASUS Sabertooth 990FX R2.0 Reference NVIDIA GTX 780 2x8GiB G.Skill DDR3-1866 10-11-10-30-T1, 1.5v 
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post #7 of 7
Thread Starter 
Hey everyone, I've installed my second 7950 (YAY), and now my top card is getting hot. I mean, really hot. I was wondering if anyone could tell me what my safe temp range would be?

I ran a FurMark benchmark, and it got up to 83C. Is that too hot, or normal, or cold? I was too scared to run a burn test to find out how hot it gets after a while of that.
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