You can call me whatever you like LOL, I have been called much worse. I am as blown away by this as everyone else, it is one of the weirdest things I have seen in a long time... Funny thing is another guy on the Flightsim forums is reporting the EXACT same thing. Both of us tried the OC'd version of the 7900 GTX opposed to the stock speeds and I have heard even the minimla OC from the factory can make these cards very unstable. You are right, it is weird Here is his post:
Just a real quick update......
Things are not going as smoothly as I had hoped.
The 7900 doesn't seem to like my CPU overclock. I was getting random lines flashing through the video when running FS9 as well as some lockups. When the system locks up, I get a weird overlay effect with all my desktop icons on top of FS9. I went back to stock CPU/RAM settigs and all is OK. Strange why that would happen as the PCI freq is locked at 100 regardless of the CPU OC. So I've got some work to do in figuring out why things don't play nice together when I OC the CPU.
The only benchmark I've run so far is Aquamark3. I ran it just after installing the 7900 and with the CPU OCd. I got a score of 96,368. Also, my "standard" 10 minute FS9 flight showed an average frame rate of 76 which is about 12 FPS higher than with the 7800. But all of this is very preliminary and with stock video drivers and little to no tweaking.
One other thing - for some reason my CPU and MB temperatures are at least 5 degrees cooler than with the 7800. Could it be that the 7900's heatpipe/fan assembly provides better air circulation? Or maybe its because the 7900's G71 GPU runs cooler than the 7800's G70 so there's less heat being generated within the case. Anyway, that is a good thing.
Stay tuned.
...Noell
Like I said, I can Prime 95 for hours with my 7800's and OC, can Prime 95 for hours with a 7900/7800 and no OC and can not Prime for 10 minutes with the 7900/7800 and same OC as dual 7800's. I am as confused as everyone. I have an FX-57 being delivered ASAP to see if I can run a stock 2.8 without issues and if it is really the OC or something on my board that does not like the combination.... Both of us are also running the 4000 chip and the Asus A8NSLI-P mobos with 3500LL memory.
This is Flippin weird,
-Paul