Serious problem with my Dual Channel RAMs

[GLH]

CPU: AMD Athlon 64 3500+
Mainboard: GigaByte GA-K8NS Ultra-939
RAM: Corsair ValueSelect 2x 512 MByte PC3200/400 (Dual Channel)

Now i bought 2 additional RAM, excatly the same (Corsair.....)

Everything works fine, but now my RAM work only with 166 MHz instead of 200 MHz !!!

WHAT'S WRONG ???

(There is no setting in the BIOS to change this.)

[henry]

Is it possible the second DDR RAM's are 333 instead of 400?
This would explain the drop in speed.

It doesn't look possible to change the speed of the RAM in the MIT(MB Intelligent Tweaker) in the bios.
You could try the 'Top performance' in the main bios settings, but I'd check the RAM before you try anything first.

Sometime pressing 'Ctrl' and 'F1' in the main bios menu gives extra options.

[Luciel]

i have the same problem, 2 512 400ddr and it runs at 166 :/

[Eagle]

That's a feature/issue/whatever of the Nforce Chipset. You have to live with it.

[Luciel]

crap

[GLH]

Originally Posted by henry

Is it possible the second DDR RAM's are 333 instead of 400?
This would explain the drop in speed.

No, all 4 sticks are 400.

Originally Posted by Eagle

That's a feature/issue/whatever of the Nforce Chipset. You have to live with it.

Do you know, if there will be a firmware update to fix this, or is it impossible?

[kosmiq]

The problem is in the A64 memory controller (the one built into the CPU-core u know)... Currently it can only handle 4 DIMMs if they run at 166MHz.

Using 2xDIMMs gives the opportunity to run at 200MHz.

Future revisions off the A64 core/memory controller may allow 4xDIMMs @ 200MHz. But as it is now, thats a no go.

So it is not the nForce chip that is the problem, it is the memory controller (and as I said it is built in into the CPU).

I would suggest selling the 4x512mb DDR and buy 2x1024mb instead.