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Problem with my Corsair TWIN2X 6400 DDR2, 2048MB CL5 Kit


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Got a problem or atleast think its a problem, here goes when i try to change the timing for the ram to what been recomended see below.


CPU External Frequency: Manually set to 200MHz

DDR2 SDRAM Clock: Manually set to 800MHz

PCI Express Freq: Auto

PCI Freq: 33.33

Performance Mode: Standard

DRAM Timing Selectable: Manual

SDRAM CAS Latency: 5T

SDRAM RAS to CAS Delay (tRCD): 5T

SDRAM Row Precharge (tRP): 5T

SDRAM Active to Precharge Delay (tRAS): 15T

SDRAM Write Recovery Time: 5

Write to Precharge Delay: 15 (If it's Listed)

Command Rate: 2T

DDR2 SDRAM Voltage: 1.9

Chipset Core Voltage: Auto

All other settings are motherboard defaults.


Everything works ok when i reboot after that aslo have run memtest, prime etc etc everything is fine. But here is the thing when i try to also overclock my C2D E6400 dont matter at which rate i change it when i reboot after that only get a black screen. Now probably you think its something with my C2D but for exampel if i start at the other end and i overclock my C2D first without changing the timing on my memory just run the memory on auto it works, but if then i also try to change timing on the memory i get the black screen after reboot.


Some info about my rig,


intel Core 2 Duo E6400 2.13GHz Socket LGA775

Asus P5B, P965, Socket-775

Corsair TWIN2X 6400 DDR2, 2048MB CL5 Kit

XFX GeForce 7900GT

Hiper ATX 530W


Any help would be nice thx in advance.

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If you want to over clock that system configuration you need to get a bigger and better quality PSU.


Yea in retrospective thats what i thought dident find any other problems, thx for the advice and keep up the good job.

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  • 1 month later...
I would suggest our HX520W minimum for that configuration or if you get another one of those less expensive units go with a 700

+ Watt unit.


Hello im back Ram Guy, bought the HX620W just to be on the safe side but you know what still same results a penny for your thoughts.

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