Change BIOS settings AGP 4X to 8X! Is it OK to do?

I have posted yesterday about my problem with restarts in 3 D MARK 2005.
See "PC restarts because of "MODE: GXO Execute BIOS Table Error""

AMD Athlon(tm) 64 X2 Dual Core Processor 3600+
Radeon X1950 Pro
Motherboard AM2NF3-VSTA
Memory RAM 2 GB DDR 2

It seems my problems and restarts stopped after I changed in BIOS AGP from 8X to 4X. I have successfully finished 3 D MARK 2005 few times and I do not see any big fps drop in games.

Can someone tell me please is it OK to change AGP 8X to 4X as I did or it could be bad for PC components?

Sorry for my bad English.

Your AGP slot on that board israted at 8x, so that shouldn't be the problem. I'm guessing you're having an overheating problem somewhere, more than likely it's your chipset. Try changing it back to 8x, take the side off the case and point a house fan at it, and then run 3DMark and see what happens.

Well my guess is, when you're setting the speed to 4x from 8x, you're reducing the amount of electricity that runs through your board at a given time, thus reducing the heat produced. That's why it wouldn't be restarting. Just a guess though, I could be wrong.

Try it a couple more times, with the side on and off and see if you can get some reliable results. You need to get some air flowing over the chipset, either by installing a fan on your side panel or getting a case with better air flow.