You'd have to try them, and you may have to loosen the latencies to 5-6-5-20, or 6-6-6-20. If it POSTS, boot into memtest86+ from the bootable CD iso or a USB stick if your motherboard is so equipped. Let memtest86+ complete at least one full pass with no errors before you adopt the RAM settings.
i did understand it but i cant change the DRAM:FSB ratio in such a way that the ram will stay at 800 MHz or below.
I can only change the ratio up which means that the FSB will be at 400 MHz and the RAM will be at 1.2 times that (or 1.5 or 2,,, and so on)
if i set it to auto the FSB runs at 400 and the ram at 960.
my mobo doesnt have the feature to leave the RAM at a static value im afraid
couldnt find an option to enable CPU RAM config, but i did find an option to adjust the clocktimings and a option to turn down the ram to 667MHz but to be honest i havent tried it so far (lack of time).