ASUS P5B w/8GB PC-6400

[Freddie]

Hi. I have recently upgraded the memory in my system from two PC-6400 5-5-5-12 Corsair modules (2x1GB) to 4 OCZ 5-5-5-18 modules (4x2GB), for a total of 8GB.

I run my Core 2 at 325 FSB normally with the DRAM frequency set to auto. With my Corsair modules it came up as PC-4200 dual channel. Now, in my motherboards manual I read that with 8GB only DDR533 or DDR667 is used, not DDR800. Upon installing my new modules I found that it was still on PC-4200 dual channel.

My question is, is this what it should be? Is Dual channel PC-5300 not available? And why when using my Corsair memory was PC-4200 used when in dual channel?

Regards, Freddie.

[JamesXP]

Up the NB voltage :P

[maxfly]

youll need to go into the bios and set the speed,voltage and timings manually.if you leave it on auto the chipset will choose them for you.

[meionm]

Maybe if you try running desired memory speed instead of auto, it might work.

[Freddie]

Since I found my system is no longer stable at 310Mhz I reset the FSB back to 270-ish (and plan to re-do my overclock at the weekend, maybe more voltage to the northbridge will do it?).

However, I found that the memory was now running at PC-6400 dual channel interleave. So upping the FSB *reduces* the speed at which the motherboard runs the memory.

If it happens when I overclock the system again I shall manually set it.

Regards, Freddie.