My P2B-DS system was unstable and had some bad caps, so I recapped all of the same 16v 1000uf caps on the board to see if that would fix it. Well, it fixed the instability, but apparently introduced a new problem. The system works perfectly when running with one CPU, but as as soon as I put a second CPU in, it starts hitching up, especially when running 3d accelerated applications like Q3A or 3dMark. Roughly once a second, but it varies.

I've tried everything I can think of to troubleshoot this, and have come up empty:

• Swapped CPUs around
• Tried different CPUs
• Tried Katmai instead of Coppermine CPUs
• Tried swapping out every other bit of hardware: PSU, GPU, RAM, HD, ide cables
• Reinstalled Win2k
• Tried WinXP
• Visually inspected and reflowed the caps I replaced
• Messed around with BIOS settings (not many to play with though)

At one point I thought it might be undervolting the second CPU because it was dipping down to 1.68V or so, but when I put the Katmai CPUs in, the second CPU actually showed slightly higher than CPU1 at 2.05v and still had the stuttering issue.

It wasn't doing this before the recap, and the only other thing that changed was the CMOS got wiped during the recap. Did I break my board?

At this point I'm out of ideas and about to give up on this one. Last thing I can think of is I'm going to try reflashing the BIOS and see if that does anything .

Anyone have any other ideas?