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PC2-6400 shows up as PC2-5300 on Asus P5WD2-Premium


TheMediaGuy

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I bought this ram:

 

Corsair XMS2 TWIN2X2048-6400C4 2GB 2X1GB PC6400 DDR2-800 CL 4-4-4-12 240PIN Dual Channel

 

to put into the Asus P5WD2-Premium. I called Corsair to verify compatibility before buying the RAM. Now when my PC boots, at POST is says that I have 2GB of PC2-5300. I paid the big money for the 800MHz RAm & now I'd like to use it as such!

 

Asus says I should enter the RAM data manually into the BIOS and talk to Corsair to find out what to put. A quick look at the manual RAm setting on that BIOS made me scratch my head in confusion. There's more than 4 variables to change so just putting 4-4-4-12 wouldn't complete the manual setup.

 

Please tell me exactly what I should put as the settings in the BIOS. Thanks!

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  • Corsair Employees

Sorry but this motherboard will run at 667MHZ by Auto if there is a spd for 667MHZ. Since this module is backward compatible we do have spd for 667MHZ and 800MHZ. Most of the 975 chipset motherboards will automatically set to 667MHZ unless manually selected. Please set the timings to the following:

 

DDR Volatge: 1.9v

DDR Frequency: 800MHZ

TCL: 4

TRCD: 4

TRP: 4

TRAS: 12

 

Note: You will need a 1066MHZ FSB CPU to set the DDR Frequency at 800MHZ. If 800MHZ FSB CPU, set the DDR Frequency to 667MHZ.

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Arg, I have a P4D-940 CPU... so that's 800MHz FSB. :[pouts:

Does that mean I have to leave it as-is... auto at PC2-5300?

Or do you mean I can use the above settings, only changing the DDR frequency to 667?

(I'm curious to know why I can't have the RAM at 800MHz to match the CPU.)

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Arg, I have a P4D-940 CPU... so that's 800MHz FSB. :[pouts:

Does that mean I have to leave it as-is... auto at PC2-5300?

Or do you mean I can use the above settings, only changing the DDR frequency to 667?

(I'm curious to know why I can't have the RAM at 800MHz to match the CPU.)

 

Actually, "800MHz" is the effective bandwidth of the CPU's FSB and the PC2-6400 memory. Your CPU's FSB is clocked at an actual 200MHz -- while PC2-6400 memory runs at an actual 400MHz. Intel chose to favor stability over performance on their chipsets; thus, the PC2-5300 limit with an 800MHz FSB CPU. After all, what good is running PC2-6400 memory at its full speed with an 800MHz FSB CPU if it's going to result in frequent program errors and/or crashes?

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