Tube Posted December 17, 2005 Share Posted December 17, 2005 I don't seem to be able to get the Twin2X1024-5400C4 memory to perform above 533 MHz with my Asus P5WD2-P mobo. Mobo manual says the default is to downgrade DDR2-667 with CL=4 memory to run at 533MHz and to use manual BIOS settings for higher mem speeds. But manually setting DRam speed to 600 in BIOS results in major instability and setting DRam to 667 gives BSOD. I have surfed for solutions eg. http://www.houseofhelp.com/forums/showthread.php?t=38150 and http://www.corsairmemory.com/corsair/products/specs/twin2x1024-5400c4.pdf As per Corsair article AN504 (URL above) I tried changing fcpu to 250 instead of 200; newer BIOS for the mobo doesn't allow explicitly setting a multiplier as in the article but you can choose a nominal memory speed. Still get instability, freezes, or BSOD at any real mem speed above 533MHz. I also note that Asus doesn't list Twin2X1024-5400C4 on its "Qualified Vendor List". I have found several references to using this memory with this mobo in Corsair documentation, but none of these provide any notes on how to configure the BIOS for the P5WD2-P. How do I configure the BIOS to get the memory to perform at the rated speed? Or did I buy the wrong memory for this mobo? Not sure how to insert system specs in message. CPU is Pentium 840D. Have tried mobo BIOS 0422 and 0606. Dual Western Digital 120-GB sata-II HDs configured for RAID mirroring (partitioned into 80 and 40 GB logical drives) plus WD 250 GB SATA-II HD on IDE. Gigabyte GF6600GT graphics card, usual DVD etc drives plus 2 ZIP dirves, Antec 550W Power Supply, Coolermaster stacker case w/ various extra fans (don't think I have heat problem). Have taken out SCSI, TV tuner, video capture PCI boards - doesn't solve the problem. Running Win XP Pro. Thanks, Tube Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 20, 2005 Corsair Employees Share Posted December 20, 2005 You would set the memory Frequency at 533 Mhz and then when you set your CPU Frequency at 250 Mhz it will run the memoryat DDR667. Link to comment Share on other sites More sharing options...
Tube Posted December 21, 2005 Author Share Posted December 21, 2005 Thanks for the advice. However the BIOS (v. 0606) does not allow a memory freq of 533 MHz with CPU freq set to 250: the nearest choices are 500MHz and 600 MHz. Set at 500 MHz the merory would run at DDR625 which would be an improvement but unfortunately the system will not boot at this setting: it goes through POST, flashes the BSOD, powers down, then powers back up and starts the cycle again. Memtest86 v. 1.65 shows no memory errors, all other BIOS settings are default. Any other ideas how I can run the memory at PC5400 with this mobo? Thanks, Tube Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 21, 2005 Corsair Employees Share Posted December 21, 2005 You will set the memory frequency before you change the CPU frequency. Please follow the lonk in my signature for the tested settings, and set the memory voltage to 2.1 Volts as well. Link to comment Share on other sites More sharing options...
Tube Posted January 10, 2006 Author Share Posted January 10, 2006 Thanks, but unfortunately the BIOS (neither v. 0408 nor v 0606) doesn't accept a combination of cpu freq 250 MHz and mem freq 533 MHz. Even if I first set mem freq, then cpu freq the BIOS changes the mem freq to 500 MHz when I exit BIOS setup and reboot. I have checked the link in your signature, by which I assume you mean the "What are the correct timing for my module?" link. Noting that for the Twin2X1024-5400C4 that link specifies a mem voltage of 1.9V, not 2.1 V, I tried different mem voltage settings down to 1.8V, the lowest setting allowed in BIOS. As mem voltage is lowered the system powers itself down and tries to re-start later in the bootup process. At 2.1 V the system powers down before the initial (black) Windows XP screen appears. At 1.8 or 1.9 V the system boots all the way to the Windows desktop, but after a few seconds powers itself down and then restarts. This occurs whether I set the internal CPU speed multiplier at 14 17 as described in the doc http://corsairmemory.com/corsair/products/tech/AN504_Intel_955X-Memory.pdf There is one setting at which instead of powering down and restarting or instantaneously flashing the BSOD and restarting the system displays the BSOD until manual power-down: CPU freq 250, mem freq 500 (manaully set to 533 but overridden by BIOS), and internal CPU speed multiplier 17 (i.e., AI CPU Lock Free set to "Disabled". In this instance the BSOD refers to a MACHINE_CHECK_EXCEPTION and the Technical Information is: ***STOP:0x0000009C(0x00000001,0xF772B050,0x84000AE8,0x00000134). The physical memory dump completes OK. In the document at the above URL this memory was tested successfully with this MOBO at a freq of 667 MHz but none of the settings suggested by yourself, the link in your signature, or the document at the above URL. Any suggestions on further testing the memory or MOBO? As per a previous post MemTest v. 1.65 returns no errors. Thanks, Tube Link to comment Share on other sites More sharing options...
Weezur Posted January 10, 2006 Share Posted January 10, 2006 Hey Tube, I had the same exact problem as you trying to force the cpu to 250 and mem to 533 in bios (version 606 here as well) on my p5wd2 board. I gave up trying to make it work that way and instead did the following... AI Overclock -> Manual cpu freq 200mhz DRAM -> manually set to 667 mem voltage 1.9v Vcore-> manually set to 1.3 as this board seems to overvolt my p4 550 if left on auto. disabled spd under chipset and set timings to 4-4-4-12-4 all other settings on default. so far it is working great and has been for awhile. memory recognized on post as PC5300 and no locks or bsod's as of yet. no errors with memtest either (eight passes). Although I wonder if I am pushing my luck by using these settings as CPU-Z shows my FSB/DRAM ratio as 3:5 and I am not sure if that is ok or not, but hey the system is running solid so no complaints. Link to comment Share on other sites More sharing options...
Tube Posted January 10, 2006 Author Share Posted January 10, 2006 Weezur - Many thanks for the advice. I'll give it a try and see how it works. Thanks, Tube Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 11, 2006 Corsair Employees Share Posted January 11, 2006 Please let us know how you make out! Link to comment Share on other sites More sharing options...
Tube Posted January 27, 2006 Author Share Posted January 27, 2006 Got a bit distracted by the holidays but thought I'd let you know that I've been using the settings recommended by Weezur with no problems so far. Played around a little bit - upping mem voltage to 2.1 seems to cause occasional instability so I'll stick with 1.9V. With the Pentium D640 I've never had the overvoltage problems reported by other users of this mobo but I don't seem to gain anything by upping the voltage above 1.3. Thanks Weezur! Tube Link to comment Share on other sites More sharing options...
Weezur Posted January 28, 2006 Share Posted January 28, 2006 Hey Tube, Great to hear that the settings are working out! :sunglasse Best regards, Weezur Link to comment Share on other sites More sharing options...
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