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Asus P5N-D + TWIN2X2048-6400C4


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I have been getting BSoD's in Vista 64bit after about 15 - 24 hours of my system being on, and I decided since I recently Dual-Boot Installed Ubuntu, that I would run the memtest86+ that came with it, and I got errors like crazy, so i took the 2nd set out, no errors.


I got to looking around, and saw the problem with having all 4 slots Populated, and Tried changing from 800 to 667 (just on the Memory, unlinking from FSB) and no difference, still getting alot of errors in Memtest86+


I currently have only my first set installed, and here are my Mobo's "Standard" settings (Intel Core 2 Quad Q9300 2.5ghz Proc)

Taken from Everest:




Motherboard Properties

Motherboard ID 06/05/2008-C55-MCP51-P5N-D-00

Motherboard Name Asus P5N-D


Front Side Bus Properties

Bus Type Intel AGTL+

Bus Width 64-bit

Real Clock 333 MHz (QDR)

Effective Clock 1333 MHz

Bandwidth 10667 MB/s


Memory Bus Properties

Bus Type Dual DDR2 SDRAM

Bus Width 128-bit

DRAM:FSB Ratio 6:5

Real Clock 400 MHz (DDR)

Effective Clock 800 MHz

Bandwidth [ TRIAL VERSION ] MB/s


Field Value

Memory Module Properties

Module Name Corsair XMS2 CM2X1024-6400C4

Serial Number None

Module Size 1 GB (1 rank, 8 banks)

Module Type Unbuffered DIMM

Memory Type DDR2 SDRAM

Memory Speed DDR2-800 (400 MHz)

Module Width 64 bit

Module Voltage SSTL 1.8

Error Detection Method None

Refresh Rate Reduced (7.8 us), Self-Refresh


Memory Timings

@ 400 MHz 5-5-5-18 (CL-RCD-RP-RAS) / 22-42-3-6-3-3 (RC-RFC-RRD-WR-WTR-RTP)

@ 270 MHz 4-4-4-13 (CL-RCD-RP-RAS) / 15-29-3-5-3-3 (RC-RFC-RRD-WR-WTR-RTP)


Enhanced Performance Profile

Profile Name High Frequency

Optimal Performance Profile Yes

Memory Speed DDR2-800 (400 MHz)

Voltage 2.1 V

Memory Timings 4-4-4-12 (CL-RCD-RP-RAS)

Row Cycle Time (tRC) 22T

Command Rate (CR) 2T

Write Recovery Time (tWR) 8T


Memory Module Manufacturer

Company Name Corsair Memory, Inc.

Product Information http://www.corsairmemory.com/products/xms_home.aspx




I don't know for sure if my 2nd set of ram is bad, but I would like some advice

on the timings/settings, etc to get my memory working correctly with this Motherboard, Chipset, and all 4 slots Populated.


Note: I do have an aftermarket Cooler on my CPU, so a slight overclock would be fine. I have never been one to dabble in overclocking, so as much

info as you can provide will be very helpful, and TIA!


Note2: I don't know for sure why my Memory timings are showing what they are, but on the RAM itself, it says 4-4-4-12 for the timings

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With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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