Help! sis648 max-L+DDR 400 =Problems???

Hi there,
have recently bought sis648 max-L and still hope I will bring this mobo to work!!!
I mainly use my computer for games. But had always freezing problems during games. It was either quiting the game abruptly to fall back to the desktop or simply ffreezing the screen and then I had to reboot.
I tried all I know to stabilize my system in changing bios settings, tried out directx 8.1 and 9.0, checked the ram, flashed the bios from version 1.2 to 1.3, tried to play with minimal video settings in each tested game (morrowind, hitman2) and installed all latest drivers I could find.
The only thing that improved the stability was to diseable the "spread spectrum" setting in bios.
Has someone an good advice what next I could try? ?(
Could it be the ram or the video card?
I would like to avoid buying new DDR or a new mobo... :]
Thanks

Hi everybody,
thanks for helping me.
I changed the voltage of my ram from 2.6 to 2.5v and that improved the stability a lot. :D
But I still got some freezings during games (but less often) and I had to run under "safe" DRAM timing settings... :(
To get a perfectly stable system, I had to "underclock" my DDR400 to DDR333. ;(
At least, I was able then to run my system under "ultra" DRAM timing settings.
What do you think, would I get better results with safe settings+DDR400 or ultra settings+DDR333 in games ?(
By! 8)

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