Motherboard/PC works fine with DDR RAM, but not DDR2

[Vivi_O]

I've got an Asrock 4CoreDual-SATA2 motherboard that I've been having BSOD issues with for about a month now. After trying more solutions than I care to remember, it seems that the memory is the problem, or rather the memory standard.

With the DDR2 667 RAM (Crucial 2x1GB), most any recent game will cause a blue screen, often with an error referring to a driver or memory issue. I've tested the memory thoroughly without errors. However, when I use the DDR 400 (Crucial 2x512MB) everything runs fine (fine as far as 1GB is concerned at least).

Has anyone ever known of a motherboard to be compatible with two types of memory, but only function properly with one? I thought the DDR2 slots might be messed up, but wouldn't have that shown up during Memtest? I've got no problem using DDR RAM, aside from the ludicrous cost, but I'd like to know why it is the only type that seems to work.

Here's the basics of my PC:

Asrock 4CoreDual-SATA2 (bios 2.20a)
Pentium Dual-Core E6500@2.93GHz
Nvidia EVGA GT 240
Memory specified above

No components overclocked.

Thanks in advance for any help. Just let me know if I need to dig up some more info on the problems I've had.

 

[Blazer7]

It may be that this board is somewhat picky when it comes to RAM. Have you tried any other DDR2 modules?

PS
There is already a very good thread that deals with your mobo here -> http://forums.anandtech.com/showthread.php?t=311715

 

[HeXploiT]

Did you set the motherboard jumper if their is one?

Did you check to see that the ram voltage is set right in bios?

 

[Blazer7]

AFAIK this board does not have a jumper for selecting DDR/DDR2. Also, if memory serves, it is prohibited to use both DDR and DDR2 at the same time as this may damage the board.

 

[Vivi_O]

Tried two different pairs of DDR2 (Crucial, PNY); both had the same issue. Voltage is set properly (1.8v). Have tried 1.9/2.0 (whatever "high" is), but that didn't help. Not using DDR/DDR2 at the same time, always just one or the other.

 

[VirtualLarry]

Those Hybrid Asrock boards were always better with DDR than DDR2 for some reason.