Abit VT7 and Cosair memory problem

[jsickels]

I have the following system:

 

CPU: P4 2.4B, 533 FSB, 512 L2 Cache

M/B: Abit VT7

Memory: CMX512-3200C2PRO, 2 sticksl

 

The sticks themselves have the above model number. The packaging has : TWINX1024-3200C2PRO.

 

I looked up on the compatibility chart and it says with my P4 system the memory should run at 2-3-3-3-6.

 

My computer crashes on bootup of Windows XP 90% of the time. If I change some settings and increase the CAS I can keep boot but if I launch any applications it crashes to the blue screen of death.

 

My BIOS settings are all on auto for the CPU.

 

DRAM Voltage: 2.70V (tried the default also)

DRAM Timing: Manual (tried auto by SPD but the system won't boot Windows).

SDRAM CAS Latency: 2

Bank Interleave: Disabled

Precharge to Active(Trp): 3T

Active to Precharge(Tras): 6T

Active to CMD(Trcd): 3T

REF to ACT/REF to REF(Trfc): 12T

ACT(0) to ACT(1) (TRRD): 3T

DRAM BUS Selection: Dual Channel (auto would not work)

DRAM Command Rate: 1T (also tried with 2T)

DQS Offset - Channel A: Non-offset

DQS Offset - Channel B: Non-offset

 

 

Looking on this web site, Abit's site, and searching on the web didn't help me with these other settings. I am sure Windows XP is not corrupted as I can replace the Corsair memory with some old Kingston memory (PC2700) and use the auto settings and have the system work fine. This is the memory I used before I bought the Coursair memory. I am not trying to use both types, I am simply exchanging the Kingston PC2700 with the new Corsair PC3200 sticks. I have tried using bank 1 & 3 and 2 & 4. I see the same problem.

 

Any help would be appreciated. :)

[Wired]

Run the TwinX @ 333 Mhz.

[jsickels]

Run the TwinX @ 333 Mhz.

 

The current speed is 200MHz according to the system settings. You know, 200x2=400Mhz because of the DDR. So when you say 333MHz do you mean the memory bus should be 333 or 166?

[Wired]

166 Mhz for the following reason:

 

If the FSB of your CPU is 400 For Intel and 100 MHz for AMD, the memory speed supports only DDR 266.

If the FSB of your CPU is 533 For Intel and 133/166 MHz for AMD, the memory speed supports DDR 266/333

If the FSB of your CPU is 800 MHz for Intel and 200 MHz for AMD, the memory speed supports DDR 333/400

[jsickels]

166 Mhz for the follwoing reason:

 

Ok, my motherboard supports 800MHz FSB which would run the memory at 200 (400 DDR) but my processor runs at 533 MHz FSB. That means the maximum memory frequency is only 166 (333 DDR) is that right? That makes sense because the memory clock runs as a multiple of the system clock.

 

What are my options here?

 

Could I run my P4 with a FSB of 400 and use the RAM at 200MHz?

 

Could I run my P4 with a FSB of 533 and use the RAM at 166MHZ?

 

Which one would have the best performance?

 

I could also just replace the memory with PC2700 and call it a day.

 

What would be the best choice?

[Wired]

That means the maximum memory frequency is only 166 (333 DDR) is that right?

Yep.

 

Could I run my P4 with a FSB of 400 and use the RAM at 200MHz?

Nope. DDR266.

 

Could I run my P4 with a FSB of 533 and use the RAM at 166MHZ?

Yep.

[jsickels]

Yep.

 

 

Nope. DDR266.

 

 

Yep.

 

 

I guess I will return the memory and get PC2700 instead.

 

Thanks for your help. :):

[RAM GUY]

The price difference is not that much between DDR333 and DDR400 if it were me I would just keep the DDR400 modules and set them manually to run at DDR333. I think that will be less expencive in the long run and give you an upgrade path.