Jump to content
Corsair Community

XMS PC3200 speed question...


Recommended Posts

I have an Asus P4P800-E deluxe mobo and a pair of 512MB XMS PC3200s running in dual channel mode, but the default BIOS setting is 266Mhz instead of 400Mhz. FSB runs at 800 by default, so that is good.


I had, in the past, set the RAM speed to 400Mhz and tweaked the timings to match the Corsair specs, but after a BIOS update it reset everything to defaults. I *could* go find where I wrote down all the settings, but this has me once again in a tizzy as to WHY my mobo won't run it as default settings.


I checked the Asus QVM before purchasing my RAM, and it was on the list, so it *shouldn't* be a compatibility issue. Any insight as to what the issue may be? Am I mistaken to think it should default to 400Mhz/vendor-documented timings? I REALLY don't like poking around this part of the BIOS without knowing EXACTLY what I'm supposed to be doing...


Here are my system specs:


2.8Ghz P4 Prescott

Asus P4P800-E Deluxe mobo

(2) Corsair PC3200 XMS 512's in dual-channel mode

(2) Seagate 80-gig 7200RPM SATA HDD in performance RAID

GeForce Ti4200 128MB (soon to be 6800GT 256MB)

Aspire X-Alien case w/ OEM 420 watt PSU (soon to be Antec 550 TruePower)

XP Pro

Case glows green :biggrin:


I'd be greatly appreciative for the help...

Link to comment
Share on other sites

Hmm, I can see it now... Both are CMX512-3200C2PT, but the first stick is XMS3202V3.1 , the stick in the third slot is XMS3202V1.2...


It makes sense, I suppose. The vendor I bought them from only had one in stock (AFTER I placed my order for two), and had to order a second stick to fill my order. It was a lot of hassle and phone calls to the other side of the country. I purchased the RAM nine months ago, so I guess an RMA for matching revs is out of the question.


Will manually setting the timing/speed work for different revisions? If so, what is the potential "down side"?

Link to comment
Share on other sites

  • Corsair Employees

The 2 modules you have are different revisions, and in order to run them in dual channel they should be a matched set. If you just purchased these I would send them back to your reseller and ask for a Twinx set instead. If that is not an option I would request an RMA from us by email and please make it clear the modules need to be matched. Se bellow for the R<A instructions.

However, you can try and set the settings manually and see if they will work together.

AI Over Clock Tunner: Manual

CPU Freq: 200 MHz

System performance: Auto

Memory Frequency: 100%/DDR400

Dim Voltage to 2.75 Volts

Resulting Frequency: 200 MHz

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 7T

Then please use http://www.memtest.org to test the system.


For the RMA if needed:

Please send us a email with a copy of the form or all of your info name address and phone# and the Module part# and copy the link to this post and email it to Rma@corsairmemory.com.

If after 1 day or 24 hours excluding weekends you do not get the rma please email the same to warranty@corsairmemory.com and we will help to resolve it.

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Create New...