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Asus P5b-e & Twin2x2048-6400c4


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Okay Ram guy - I've read the other ASUS P5B related posts and I have a slightly strange variant.


I have the TWIN2X2048-6400C4 x2 = 4 gigs of ram


Vista BSODs and gives "memory error" messages.




1) all 4 sticks present = memory error (1st pass)

2) removed 1 matched pair = no error (3 passes)

3) swapped with 2nd matched pair = no error (3 passes)

4) individually tested all 4 sticks = no error (2-7 passes each)

Vista Memory Test

5) all 4 sticks = error & reboot


Swapped the MOBO via RMA with no help

Put in new 700 watt powersupply (see profile specs)


Is it possible that it is the L2 cache or the videocard that is throwing these errors??? If so - how would I test them?


Is it possible to have Corsair professionally test my RAM??


I do have the voltage set to 2.1v, and I will check the prewrite cache and disable the legacy USB tonight - but would having those active give the kind of errors that I'm having?


Obviously I've thrown a lot of $$ at this problem and I just want it fixed...



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I will try adjusting the MCH/NB voltage tonight...

Is there any way I can test to see if this is successful, or should i just do MemTest84 with all 4 sticks in?


A local repair shop was telling me that since I have 4 sticks of ram installed that I should relax the SPD settings - in your opinion could this also be the case?


I would prefer to run the ram at the standard 4-4-4-12 settings as it was designed, and prefer your solution, but what are the chances that they're right?

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So - when I posted I was actually running the last stick through MemTest - and this time it threw numerous errors.


I guess this means I should return it to Corsair for testing/RMA if necessary and go from there.


Thanks for your assistance.

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As Corsair will always RMA for you, I suggest you use Memtest one last time to test this DRAM out. You do not want to RMA and then have the same issue repeat due to other problems.


Enter your BIOS. Load Setup Defaults, Save Setup Defaults. Set your DRAM to 667Mhz. Vdimm to 2.1v. Timings to 4-4-4-12 and MCH +.05v


  • DRAM Stick #1
  • DRAM Stick #2
  • DRAM Stick #3
  • DRAM Stick #4


  1. Download Memtest from http://www.memtest.org .
  2. Extract the ISO image and burn the image to a cd.
  3. Shut the system down.
  4. Remove all but one stick.
  5. Boot to the Memtest CD and allow for two full passes.
  6. Remove the stick and insert another.
  7. Retest.
  8. Do the same for all sticks.


Results per stick?

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