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Dear Ram Guy :)


I followed your settings for Asus P5B but it kept crashing at that settings. I thought maybe it's that buggy MBO and continued using at slower settings stable and I didn't RMA it because my dealer here in Croatia doesn't seem to have Corsair anymore(it's still under warranty of course) and I can't afford to be without working computer.


Now I have Gigabyte P35-DS4 and once again, no default timings here - even with 2.45v. Seasonic 430W is the PSU so it cannot be an issue here because I heard they are some kind of "quality".


Can you help me? I paid a lot of money for something that obviously doesn't seem to work well...


Thanks in advance.

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I used what you have written:


Testing parameters for Twinx/XMS2-6400C4D:

Twin2x2048-6400C4D Data Sheet


Motherboard make and model: Asus P5B, P5WD2 or M2N32-SLI Premium/Deluxe

Each pair is tested and packaged together using the following settings:

AI Over Clock Tuner: Manual

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: 4T

SDRAM RAS to CAS Delay (tRCD): 4T

SDRAM Row Precharge (tRP): 4T

SDRAM Active to Precharge Delay (tRAS): 12T

SDRAM Write Recovery Time: 5

Write to Precharge Delay: 15 (If its Listed)

Command Rate: 2T

DDR2 SDRAM Voltage: 2.1

CPU Core Voltage: Auto

FSB Termination V: 1.50 V

MCH Chipset V: 1.65V

ICH Chipset V: 1.20V

All other settings are motherboard defaults.

Maximum DDR2 recommended VDIMM: 2.1 Volts



No, I haven't test them individually but I'll do that today.

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Thank you for this great support. :sunglasse


I've just sent the RMA request. I have 2 maybe a little bit silly questions:


1. What memory I am going to get? I don't see this model here anymore:



2. Dominator airflow fan

It's impossible to find that fine add-on here in Croatia. Any chance of something "amateurish" like money sending with faulty ram?

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  • Corsair Employees
I am sorry but you would need to talk to our customer service on these questions. Our hours are from 8:00 AM to 5:00 PM Pacific time Monday through Friday, please try to call them again at 888-222-4346 or 510-657-8747 Ext "0" and do not hit any other extension or send an email to rma@corsairmemory.com along with your RMA# and ask them.
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  • 4 weeks later...

RMA Status for TSX Case #397147 [ Go to your case ]

Thank you for choosing Corsair products! The following is the status of your RMA Number 1042168.

RMA Issued On: 1/11/2008

Defective Parts Received on: 2/1/2008

* NOTE: it may take up to 24 hours for this date to be updated after arrival at Corsair

Part Number Received: TWIN2X2048-6400C4D

Quantity Received: 1

RMA Replacement Parts Ship Date: N/A

Replacement Part Number: N/A

Replacement Part Quantity: N/A

Replacement Shipping Method: N/A

Replacement Shipping Tracking Number: N/A


It passed almost one week and they didn't even decided on status of this?

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Yes, it's updated now and as I can see, UPS tracking works correctly.


However, I am little bit disappointed because I'm not getting new Dominators since I didn't payed for cheaper XMS2 series.


These are some TWIN2X2048-6400C4DHX G which aren't good as Dominator because they don't use fine Micron chips, it uses cheaper PROMOS.

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  • Corsair Employees
Micron chips have not been used on any of our 6400 series parts in any considerable quantity for over a year now, this is because the chips are simply not available. Due to 6400 spec becoming standard and demand increasing beyond our available supply, we needed to find a chip that would pass at the same spec and be readily available at the same time. There will still be occasional spill over of Micron chips that make it into a 6400 part, however it is usually because the chips will not pass at a higher spec. If you are running these modules at their advertised settings there will be no difference in performance or compatibility. It is true that the Micron chips respond better to increased voltage and that potentially you would be able to overclock the memory a little bit higher with Micron, but this is not always the case. The only other difference between the DHX and the Dominator parts (other than the color of the heatspreader) is that the Dominator parts are programmed with an EPP which allows you to automatically configure the memory if you are using an nvidia chipset.
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