P4P800/2.4c Problem PLEASE HELP

[Frame]

I have some questions for you guys. I have a 2.4c and Asus P4P800 deluxe. The chip will easily do 3.06 (255FSB) with the memory @ 320. This is achieved with no Vcore or DDR Voltage adjustments. The memory will run @ 400mhz with the chip clocked at the stock 2.4 speed. However, when I try to run the chip at 250 FSB and the RAM at 400, the system will not even post. In fact at times it gives me a BIOS checksum error. I have Kingston Hyper-X PC3500 memory modules, matched pair 2x256 =512, so I figured this RAM would be able to achieve this speed. I have no idea why the chip and RAM will overclock independently but not as a package. I have tried manually setting AGP/PCI bus to avoid going out of spec on a card and causing the system not to post. I have also tried relaxing the latencies on the RAM. No matter what I do I simply CANT get the system to operate at 250/400. This is upsetting me because I paid premium price for PC3500 and it appears im getting the performance of PC2700-PC3200. PLEASE HELP.

[Hawk]

Hey, I hate to burst your bubble, but if you FSB is 250, and DDR is 400, the memory is really running at DDR500. Your memory probably cannot handle it.

250FSB w. DDR320 is DDR400 :)


Try running you system at FSB210 & DDR400, so it's DDR420 and see if it works. . . .

[LastRide]

I already posted a reply to your question here. http://www.bleedinedge.com/forum/showthread.php3?s=&threadid=117&perpage=15&pagenumber=2

[Frame]

Good deal. I guess 5/4 is the best you can hope for at 250fsb. Let me know if I am still mistaken.

[Chuck232]

Unless you've got something like OCZ Gold, you won't be able to run 1:1 at 250MHz. So yeah, running at 5:4 would be your best choice. (the 320MHz option I believe)