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Usable ram error CMD4GX3M2A1600C8


Ryeback

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Could somebody please help me with the following problem:

 

I have installed Corsair CMD4GX3M2A1600C8 4gb ram DDR3 in slot A1 and B1 of the Asus P7P55 Pro motherboard.

I have an Intel i7-860 and ATI HD5850 with Windows 7 64bit.

Mem test is giving no errors but both memtest and windows say I have 4gb ram installed, but single ram with only 1,999 GB usable. What should be dual channel with 4 gb usable....

 

mem test says:

Memory: 2039M

Chipset: Core IMC (ECC : Disabled) / BCLK: 133 Mhz

Settings RAM: 668 Mhz (DDR3-1337) / CAS 9-9-9-24 / Single Channel

Slot 0 2045 MB PC3-10600 Corsair CMD4GX3M2A1600C8

Slot 1 2045 MB PC3-10600 Corsair CMD4GX3M2A1600C8

 

So it is not working properly.

 

Could somebody tell me how to tune the bios or the ram to use the full 4gb?

 

Thanks!!!

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