Athlon64 3200+ Venice on Neo4 Plat (no SLI) showing +10MHz but no OC

Question

Hi all- I've a:
Athlon64 3200+ Venice (no OC)
MSI Neo4 Platinum (not SLI)
(2) 512MB Kingston Value 3200 (200MHz) DDR (dual-channel, slots 1 and 2)
250GB Seagate SATA
Some kind of 16x DVD+R/W 
Gigabyte 6600GT (stock clocking)
Antec 450W SmartPower 2 (12V-17A + 12V-15A IIRC)
Back story: I was having random lockups during gameplay, every 2 or 3 hours in Guild Wars (all games did it, just GW most of all). Moved RAM from slots 1 and 3 to slots 1 and 2. Didn't help. Then set PCIe clock 5 MHz ahead at the suggestion of one of these forums, which seems to have fixed the problem. (Thank you so very much all!)
I look at PC health when I go to BIOS and it shows (with no overclocking) DDR at 1 MHz higher than normal and CPU at 2010 MHz, instead of the supposedly stock 2000 MHz.
Could my lockup issues be related to this quirky MHz speed? (OC'ing the PCIe appears to have fixed it). I now understand PCIe was probably running asynchronous to CPU timing the entire time (and still is?)  :(
What could cause the slight OC in RAM and CPU? I have all settings on auto for CPU voltage, which hovers around 1.4 (normal from what I see online). Interestingly, all my voltages are being reported as pretty much spot-on except the 12V, which is showing 12.5V consistently.
Any ideas or suggestions? I'd like everything with as tight a timing as possible because I want to make sure this lockup issue NEVER comes back!
Thanks in advance for any advice!
EDIT: (2) 512MB oops. . !

Answer 1

    It think it may finally be gone, but I'll have to try tonight and tomorrow to be sure. I played Guild Wars for around 5 hours last night with no lockups.
Here's what I did:
Googled "PC lock up" for some crazy reason, just to see what other ideas were out there. Like 3rd link down brought me to a page where a guy had my exact same issues and same board but an ATI card. He had tried pretty much the same things too. He said he fixed it by updating his AC97 sound card drivers.
At that moment I didn't even know what was actually on my board, but I knew it was a generic card I was probably never going to use anyway, and I didn't recall getting any sound card updates for this board. So I looked in device manager, and bingo: AC97 device under multimedia devices.      I immediately did two things to completely eliminate the rascal: updated the driver for it and promptly went to BIOS and disabled the sucker. Also disabled SATA group 2 (slots 3 and 4), the Marvell LAN because I only use one ethernet anyway (the nVidia one, which from what I was reading, was probably the more robust of the two), both RAID controllers (actually I had disabled them earlier to skip the annoying RAID setup screen), and put the PCIe bus back to 100MHz (rogue: I was wondering about possible damage over time with this too high too, so I was glad to try setting it back to normal!) Also ran Driver Cleaner to rip out the detonators even though I was putting in another nVidia, and then put in the 6800GT and installed drivers. (In case you were interested, my 3dMark05 score went from 3511 under the 6600GT to 4939 under the 6800GT! I now run in 1280x1024 at max effects and I'm completely spoiled in one night already!  )
Anyway, one of these myriad, desperate attempts must have worked because I get neither audio stutters (should have been a freaking clue in the first place, duh!) nor lock ups.
Since this is the first PC I've built, I was certain I had to have screwed something up hardware-wise or found some combination that had incompatibilities. If it WAS just the freaking sound card driver I'm going to leave this place in shame and never post again!    In my defense, the MSI Update utility didn't show any updated sound drivers for me, and I had assumed it was being pre-empted by my SB Live in any case.
I was convinced this problem was (if it is indeed gone) a video card issue but I can't say it ever was without putting the 6600 back in and running for several hours. I'm going to bet it was the AC97 though because nVidia boards have always been fantastic for me, I haven't had any actual motherboard issues, my RAM and CPU are just fine, and Win2k has never let me down. 
Don't assume anything, though, I've learned. 
One thing to note: when I was checking out the AC97, I noticed it was *sharing* IRQ 20 with the nForce NIC detector (might have a different name, I can't remember right now). Apparently this is a capability of Win2k to share IRQs but it kind of added to my suspicions anyway.
I'll let you know how the next few sessions go and whether this issue is still an issue!