I know this is an old topic, but I just picked up a system I might buy from someone and I have the same issue, however I don't see any jumpers near the RAM slots. The system:
AMD Athlon XP2500+ / Socket A (Barton)
MSI MS-6712 Motherboard (VIA KT400A Chipset / VT8235 Southbridge)
AMI BIOS (v07.00T)
There are settings in the BIOS for overclocking, but I have very little experience with setting the clock frequency, so I don't want to tinker with it. I did change the CPU FSB clock speed from 100 to 200, because I know the multiplier is at 11 right now. So I figure 11x100 = 1.1GHz (which it's running at now) so 11x200 = 2.2GHz, which is well under the 2500+ advertised on the chip. Well when I saved the settings and reset, I got as far as the WindowsXP loading screen, and then it just resets itself. Then I read that you must disable the spread spectrum if you overclock because even a little jitter can lock the system up, so I did that, and still nothing. Also, after changing those values, after selecting a few options in the BIOS, it appeared that the screen was not redrawing. That is to say, It basically didn't erase pop-up menus after I'd made a selection from them in the BIOS. So everything began stacking up on top of each other, and I couldn't read a damn thing. Once I finally reset the settings back to default, the problem went away.
This is all new to me, and I'm a little concerned that there may be another issue with this thing. Sorry about the post being attached to such an old topic, but I figured a little history on the subject would be best.
If anyone has any ideas please let me know - I don't want to buy this thing if it has problems!
THANK YOU!!