I'll try to simplify and explain this issue the best that I can.
First, my pc specs
AMD X2 3800+ processor
Asus 8AN SLI Premium (fanless design)
2gb Corsair XMS RAM
250 gb seagate HDD
Hyper 580 Modular PS
Cooler Master centurion mid tower case w/2 fans
Lite On DVD optical drive
Creative X-FI Platinum sound card
(2)Evga 8800 gts/ (1)Saffire x800 pro
When playing World of Warcraft, the far right pixel collumns would become discollored after a half hour of gameplay. They would alternate colors and could be red, blue, green, white, orange and more. At first I didn't think too much of the issue and still don't but its something to point out.
NOTE: I know for a fact this issue is present with my x800 pro, but I can't remember if this is also true with my 8800 gts.
When playing Counter Strike: Source, there was a bigger issue. About 20-30 minutes into the game, the game would appear to be having a much lower frame rate. Yet when I check the frame rate using the console this dip in framerate would not be present.
NOTE: This issue is present with both video cards, the 8800 gts and the x800 pro.
The first step I took was adding a fan to the side of the case over the motherboard. This did not alleviate either of the issues.
I then tried different video games. The first was F.E.A.R. This game did not have the first issue and did not appear to have the second issue, but then again I was already getting a low frame. The second was Half Life: Episode 1. This game did appear to have the second issue, but this game was also getting a much lower frame rate to begin with.
My third step was to try a different video card, the 8800 gts. The second issue became even more unbearable with this video card because this one gets much better frame rates than the x800 pro. As I said before, I can't recall if the first issue was present with the 8800 gts.
I then decided to try a different motherboard, processor, RAM, case, hard drive, and Power Supply. essentially a different computer
Biostar T-force 6100-939
Western digital 250 gb
AMD Athlon 64 3700+
Apex micro atx case
1gb corsair value select RAM
A generic 300 watt that came with the case
With the x800 pro, the second issue was no longer present, but I believe the first issue still was. I was even using a 300 watt even though the card recommends a 350 watt. Even more I've used this PSU with a 7900 gt that recommended a 450 watt psu. =)
I was so excited with the results that I switched the PSU and the video card with my HYPER 580 watt and my 8800 gts. Guess what? Both issues were no longer present and I could finally use my 8800 gts to good use.
Since then I've added the 2gb corsair XMS ram to give the pc a total of 3 gb of ram and I am still using it today.
This leaves my Asus motherboard, the processor, the sound card, as the cause of the issue, if this is indeed a hardware issue. And I find it hard to believe that the processor or sound card could be the cause, so that leaves the motherboard.
I'm open to any suggestions, questions or insights into the situation that you "experts" would like to add.