The PC6400 to PC8500 Conundrum

[Eastcoasthandle]

Why is it that Micron based PC6400 Pro ram (micron based) can be OC'd at dram frequency higher @ at 4-4-4-12 while most PC8500 ram that I've seen/and used is stuck at DDR2 1066 @ 5-5-5-15? No matter what bios settings you tweak you can't get Micron based PC8500 ram at 4-4-4-12, maybe 5-5-4-12 but not 4-4-4-12. What am I missing here? MCHv, PL, Row Refresh Cycle Time, Dram/northbridge voltage, etc has no effect. What gives?

[zanzabar]

what board are u on, and what are your base voltages

[Eastcoasthandle]

Ok I figured it out, Corsair PC8500 ram need close to 2.3V dram voltage at 1.60V+ on the northbridge to get 4-4-4-12. However, this ram is only rated at 2.2V not 2.3V.

[ziddey]

it may be called 6400 or 8500, but what specific ic's are you talking about / comparing?

[zanzabar]

Ok, I figured it out, Corsair PC8500 ram need close to 2.3V dram voltage at or near 1.60V on the northbridge to get 4-4-4-12. However, this ram is only rated at 2.2V not 2.3V.

what ram is it, if ur on something like promos, qib or powerchips c4 isnt going to happen, u would need hynks or micron for low cas

i though that u were speeking of the same micron ics but on different spds

[Eastcoasthandle]

The PC8500 Dominators use micron D9GMH
The PC6400Pro use micron D9Gxx

Both used on the Max Formula

[ziddey]

how many modules have you used? i've been able to get decent d9gkx and good d9gmh to 500 4-4-4 with between 2.0 and 2.1v before.