Memory frequency problem with K8n Neo4 Platinum

Question

I have 4 banks of memory installed:
2 x 256 GEIL ddr400 Cl2 and 2 x 512 CORSAIR ddr440 cl2.5, total 1.5Gb ram.
They are in dual channel mode, but they run at 100hz and not at 200hz.
If in the bios i set the manual mode for the memory and set 200 hz, than after the reboot they are at 200 hz but in games like wow, css or others the system freezes.
If i let the auto mode for the memory, the system set them at 100 hz and so the problems disappear.
I see the value 100 or 200 hz in the "cell menu->ddr rate". This value is confirmed from cpuz.
How can i set them to 200hz without system freezes?

Answer 1

Quote from: JayBee on 13-December-05, 03:27:53
3 gigs (256x2 + 512x2) is an inherently unstable combination.  While the system could boot that way, you are asking the memory controller on the cpu to negotiate too much when it must run one channel at one type of timing and the other channel at an other.  Even under the best circumstances, you can boot that way but will fail memtest when system is stressed.  Only stable way to use all 4 dimms slots is with 4 identical modules (same size, cas, etc, i.e., same everything). When it comes to mixing sizes like that (2x256 and 2x512), Intel can do it (memory controller is on the board) but AMD cannot (memory controller is on the processor).
Edit- mixing brands (Geil and Corsair) is an other reason why it has to fail.  Intel could do it.  AMD cannot.
Edit Edit- What 400 Watt psu is that?  Note that you need 18 amps on +12 Volt rail minimum for Neo4.  Does your psu have that?  Just because the label says it, does not make it so.  Check what brand it is.
The output at 12V is 18A