Quote Originally Posted by vocch View Post
Strangely enough it seems this is what has happened to my memory which worked perfectly with earlier bios...so how do you fix it?
Here is the problem explained:
The mobo will set the mem timings/frequency according to what the SPD
on your mem modules say. So if you have ddr2 800 4-4-4-15 the mobo
will indeed set it up to this spec, but here is the problem it will only provide
it 1.8 volts (based on the DDR2 JEDEC specification). This causes the black
screen no post because your memory manufacture (Like most performance
memory manufactures) can only provide those frequency's, and timings if
the memory is overvolted beyond the DDR2 JEDEC specification (i.e. 2.0-2.1v).

I fixed mine by modding my SPD so the mobo thinks my mem is ddr2 667mhz instead of the actual ddr2 800mhz. So If it boots up and tries to set the mem
timings/frequency/voltage automatically it will only set it to 667mhz which
works fine at the standard 1.8v. Im now able to set the timings/frequency/voltage manually in the bios to 800mhz 4-4-4-12 2.1v.

So here's how you fix it google SPDtool and DL it.
Run it, go to file, and select read (chose one of your highend mem modules)
Save this as your orig SPD
now in the bottom pane scroll down until you find:
"SDRAM Cycle time at Maximum Supported CAS Latency"
Change it to "3.00ns (333mhz)"
Save the new SPD and write it to your mem modules.

Good Luck