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Problems with Overclocking my 7950

post #1 of 3
Thread Starter 
Hi everyone! Again, I'd like to say I love this website. I am trying to change the core voltage of my XFX 7950's. I have them running in crossfire and they work great, but not as well as I want nor expected. I haven't got them to overclock really. I've ran benchmarks on a low overclock, and saw really no difference. I want to crank the core and mem clock, but I can't go any higher without crashing. I do benchmarks on Bioshock through the games benchmarks. I used CCC for OC (even with AMD overdrive on power control at 20%), then MSI, and even Trixx. All voltage locked. Its frustrating. I've looked up other solutions, even with disabling some stupid setting that AMD has to reduce power and shut off my second card when its not needed. Most of the fixes have required me to mess with the registry. Still no luck. I also am wondering if a third 7950 is necessary. PLEASE note that I play at 120 hz.... therefore I like my game maxed at 1080p AND at 120 FPS consistently. Also note that I have only 1 fan on each card, sadly, so overheating could be an issue but I don't really know. I can run most games at maxed with 120, but not all of them and it annoys the **** out of me. For how much money is into my build (and being a freshman in college) it should be a tad bit better. I do love my PC but I want more to be honest. Here are my specs:

Intel 3770k Quad with HT @ 3.9 GHz stock (plan to overclock)

Asus Mobo with 3 PCI x16

2x XFX 7950's in crossfire @ 950 MHz core and 1250 mem stock

8 GB 1666 MHz Corsair Ram

128 GB SSD

500 GB HDD

850W PSU

ASUS 24" 1080p 3D 144 hz monitor (Running at 120 with Lightboost)


Any help or even thoughts are greatly appreciated, please feel free to give me your honest opinion.

Thanks again, TJ.
post #2 of 3
Thread Starter 
frown.gif
post #3 of 3
I own 2 sapphire 7950s in crossfire and they have a bios switch which makes the stock voltage switching between 1.169 and 1.25 with the same clock. I usually use the bios with low voltage and trixx 4.40b(mod) to push up the voltage. However, I don't know why any efforts to undervoltage are in vain. Voltage always automatically went back to stock no matter how I set them in trixx
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