Asus P4P800 doesn't have DRAM "lock"

[apocalypse]

I put the FSB to 211 Mhz, rebooted, and ran CPUID, as that tells me FSB and DRAM frequency. Lo and behold, the DRAM was being overclocked as well, even though it was set to 400 Mhz, which I assumed (and all literature points to) was a "lock", much like the AGP/PCI frequency lock.

The DRAM "lock" is not a lock at all, and when set to 320 Mhz, is actually a 4/5 divisor. This little chart should help clarify.

FSB MEM-400 MEM-320 MEM(320)/FSB ratio
200.00 200.00 160.00 0.80
201.00 201.00 161.00 0.80
242.00 242.00 193.67 0.80
243.00 no post 194.00 0.80
247.00 no post 197.67 0.80

Well, it turns out the CPU is a great overclocker. My FSB is now 243 Mhz, and the memory, when set to 320 Mhz, is actually running at 194 Mhz, which is darn close to the 200 Mhz it should be running at.

I hope this helps anyone out there with any problems that are having!

[Thundershaft]

Memory speed goes with the FSB.. the higher the FSB, the faster the memory goes
now if u want to still have 400 MHZ memory.. turn the multiplier to 5:4 .. and oc the FSB to 250 =)