Recently changed from a FX5200 to a 7600 GS AGP.

Did you remember to remove the old FX5200 nVidia drivers and install the ones for the 7600GS? That could be important. Your CPU is quite weak, but it shouldn't bottleneck the 7600GS nearly that much.

Download driver cleaner pro and clear all the old drivers and do the restart and then install fresh drivers - see how that goes and post back.

Correct me if I'm wrong, but the minimum specs for WOW is an 800MHz PIII. Remember that they want lots of people paying money so they can play wow, the lower the system specs, the more money they can rake in. I'm pretty sure a 2+GHz celeron is faster then an 800MHz PIII. I doubt its a driver problem as well, both of those cards use the same driver.

Are you sure about the lack of virus? Are you sure there is no performance gain? (don't forget to check the detail settings.) How much of your memory do you have free? Are your AGP settings correct in the bios? (meaning you are running at 8X, not 1X or PCI mode.) Speaking of which, make sure your harddrives are in DMA mode, not PIO.

Lets start here. There is a performance increase, 3DMark showed it. Now we need to figure out why its not showing in the games.

The other thing to remember is that while it may not have appeared to improve much, you may now be actually running much better shaders, instead of the partial-precision or DX8 &lower stuff the FX usually reverts to.

So if it's running all the siny DX9/SM3.0 heavy geomtery or texture load stuff it may be doing 5 times more work, but at the same performance level as before.

I agree with the others, make sure you clean out the old drivers, and then re-install the new ones, but also look at the settings and see if suddenyl it didn't auto detect or set new checkboxes or move sliders to the right.

Personally I lways thought games like WOW were sysem bound, but I don't play them enough to know.

CS:S should be fine with that CPU despite being a Celeron. But a big map or many players may be enough to limit any benefits you notice in your upgrade.

It seems strange to me cause when i went from FX5600xt(64 bit) to 7600 GS on Athlon XP 3200+ it was almost 300% perfomance increase in WoW.My cpu is limiting my 7600gs only in big cities like orgrimmar or stormwind.So try installing new vide drivers and check temps of cpu maybe it is throttling.

GPU sounds like its running warmer than it should but not to a point that would cause a slowdown. The 7x00 series should run into the 80C+ range without throttling if past experience serves me right. One thing you might look into is a clean install... a lot of work though. The "regardless of video settings" would definitely suggest CPU limiting but there could easily be other factors.

-mcg