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CMX 3200 RAM not working.


Orionuk

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(long post sorry! wanted to be sure I give all the facts!)

 

I have a problem with regard to a possible incompatibility between two Corsair RAM modules. For my system specification please scroll to the bottom.

 

I had the following setup:

DIMM1 = Corsair CMX512-3200LLPT

DIMM2 = empty

DIMM3 = empty

 

I purchase same DDR speed RAM from same manufacturer (Corsair CMX1024 3200) and added it to DIMM2 so the setup is as follows:

DIMM1 = Corsair CMX512-3200LLPT

DIMM2 = Corsair CMX1024-3200C2PT

DIMM3 = empty

 

However after booting up my PC I got no display, BIOS did not appear and VDU light remained in standby (ie orange).I swapped the DIMMs around and that did not resolve it. So I took the 512MB out and put the 1024MB in there instead to give me this configuaration:

DIMM1 = Corsair CMX1024-3200C2PT

DIMM2 = empty

DIMM3 = empty

 

This did boot up ok but obviously only gives me 1024MB. I assumed that aslong as the RAM is running at the same DDR speed then their should be no problems. I have compared the details of the two DIMMS:

 

Corsair CMX1024-3200C2PT

Memory Module Properties:

Module Name Corsair CMX1024-3200C2

Serial Number None

Module Size 1024 MB (2 rows, 4 banks)

Module Type Unbuffered

Memory Type DDR SDRAM

Memory Speed PC3200 (200 MHz)

Module Width 64 bit

Module Voltage SSTL 2.5

Error Detection Method None

Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings: @ 200 MHz 3.0-3-3-8 (CL-RCD-RP-RAS)

 

Corsair CMX512-3200LLPT

Memory Module Properties:

Module Name Corsair CMX512-3200LL

Serial Number None

Module Size 512 MB (2 rows, 4 banks)

Module Type Unbuffered

Memory Type DDR SDRAM

Memory Speed PC3200 (200 MHz)

Module Width 64 bit

Module Voltage SSTL 2.5

Error Detection Method None

Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings: @ 200 MHz 2.0-3-2-6 (CL-RCD-RP-RAS)

 

Now other than the amount of MB and the memory timings there is no difference between the two DIMMs, unless of course the timings are the problem.

 

Can anyone help me as to why these will not work together on my motherboard? Is there something on my BIOS I need to "tweak" first?

 

 

Thank you!

 

Orionuk

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  • Corsair Employees
I am sorry but you cannot mix speed grades of memory with this platform, I believe there is some note about this in the user manual as well. This is a limitation of the memory controller in the CPU. You should use modules that are matched both in part# and revision or the system may not run properly. It would be best to purchase a Twinx set of modules for best performance.
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