E6600 unstable at STOCK speed :(

I put this PC together and it can run SuperPi just fine, but attempting to run a SECOND instance of SuperPi causes an error ("NOT CONVERGENT IN SQR05"). Any ideas? I haven't even tried to overclock yet. Upgrading to BIOS 0804 didn't seem to help.

Core2Duo E6600
ASUS P5B Deluxe
2 x 1 GB OCZ DDR2-800 (PC6400) 4-4-4-12
Antec 900 case
Antec Phantom 500 power supply
2 x Seagate 400 GB SATA/2 HD's
Samsung DVD combo drive
Floppy disk

Edit: I'm also using Thermaltake Big Typhoon. My temps around 30-32 typically.
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More about e6600 unstable stock speed
  1. Sound like Vdimm .. Try to increase vdimm by one notch ...
  2. yes, memory timings might be not well set up or Vdimm may not be enogh for them
  3. Every instance of SuperPI has to run inside a separate folder because it saves temporal data to disk.
  4. >Every instance of SuperPI has to run inside a separate folder

    LOL I'm a real n00b :oops:

    Yes, running two SuperPI's from the same place was the problem. It seems to cause "NOT CONVERGENT IN SQR05" on every PC.

    Thanks a lot!
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