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Asus P4P800 and TWINX2048-3200PRO


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First of all, to start off...I have been having problems with my motherboard which is why I bought the corsair ram...I thought the old ram was causing the problem so I replaced it with just the 2 1gb twinx2048-3200pro. I'm sorry if this ends up being a long post, but I've been working on this problem for a while and bought $600 worth of corsair ram hoping for a quick fix lol.


BTW, my system has p4 Northwood 2.6ghz 800fsb, p4p800 (regular, not deluxe).


The problems I was getting from my motherboard before I replaced the ram was that the onboard lan(3COM 3C940) will, at random times, come up saying the "Network Cable has come unplugged" and I will lose my internet connection for about 5-10 seconds. This isn't a very big problem in itself except that it will interrupt any download and boot me from online games. I replaced the cables, I made sure they're in tight, I got the latest drivers for the lan from asus...nothing worked. The second problem I was having is not being able to use memory acceleration mode from bios. Whenever I would turn on memory acceleration mode, the pc would reboot after I saved the bios and nothing would come up...just a black screen, I had to cut the power to the pc, then turn it back on and it would come up in bios saying "Overclocking Failed!!" and I had to go in and turn off memory acceleration mode.


So I went to the asus helpdesk online and told them my problem...they told me:


"The problem you are reporting is a stability issue and is usually caused

by either the memory, power supply or the CPU running too hot."


So I knew my pc wasn't overheating, I have 4 fans, I'm not oc'ing, and I have PC Probe from asus that monitors the cpu and case temp and sets off alarms if it overheats. They put in their reply that they recommended:


"If the CPU speed is above 700MHz, the power supply we suggest as follows:

350 Watt with +5V @ 30 amps, +12V @ 12 amps, and +3.3V @ 22 amps."


What my power supply says on the side is: LC-A350ATX, +5/35A,+12/12A, 3.3/24A. That's as far as I know to go to check the power supply, but it seems like I would have enough.


So after seeing that all those were ok, I decided to change the ram. I went with the corsair TWINX2048-3200PRO. I installed the ram and it automatically came in 2.5-4-4-6. I saw that corsair website recommended 3-3-3-8 for my board, so I changed it to that. I tested both the sticks individually with memtest when they came in and neither had errors. After installing the new ram, I get a whole new set of problems.


1.)After installing the corsair ram, my FSB changed from 800.00, to 801.82. My frequency?(is that what it's called?) it used to say 200.00x13.0. Now it says 200.46, and it has a list of options to change it to and none of them are 200.00. Therefore, my MHZ is 2605.88(i'm watching it right now and it just jumped from 2605.88 to 2605.91 and is teetering between .90 and .91) instead of 2600.00.


2.) Now, when I try to use memory acceleration on the board, it is able to reboot and successfully load my os(winxp pro), but only lasts about 5 minutes in the os before it freezes and I have to cut the power. When it reboots it says "Overclocking Failed!!" and I have to go into bios to turn off memory acceleration. The thing is, when I go into bios from the "overclocking failed!!" screen, that is the only time I'm able to see the options to change my ram mhz, the tech rep I talked to told me I had to turn off automatic SPD settings and those options would come up, but I did that and it doesnt come up.


3.) The onboard lan is still doing the same thing. Still cuts off at random times.


I did call asus and talk to a tech rep who recommended that I uninstall Service Pack 2 and see if that helped with the lan problem. I did that and no luck, it still occurs. I'm getting tired of the whole deal about ready to give up, but thought I'd post here to see if anyone could help. Thank you so much if you actually read all of this, you achieved sainthood in my world.



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  • Corsair Employees

Well the LAN issue could be several things, and I would try another PSU if you can, although your PSU meets the requirement it may not be stable with your configuration. And or you might try and ask over at http://www.asusforums.org that is an un-official fan site that has some talented people that might have some suggestions to help find the cause of the problem.



For the memory issue, I am sorry but we do not officially support any performance setting that is not part of the chipset design, and MAM or PAM would both fall under this description. Reason is they will sometime change memory timings out of range and they do not publish the actual settings that are being changed. However, that is not to say it will not work. I would try and load setup defaults with the latest bios Ver 1.020 Beta 2 installed and then set the Dim Voltage to 2.75 Volts and set the timings manually to Cass 3-3-3-8 and enable MAM and then exit saving changes and test with http://www.memtest.org if you get errors please try and set MAM to AUTO or Disabled and test again.

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