Since neither of these boards officially support Tualatin, it's very unlikely that the unknown CPUs would be that type. They're almost surely Coppermines. If that's the case then they add little monetary value.
I have a GA-6VXD7 put together right now, and I had a single CPU P2B-F a few years ago. I haven't used the Gigabyte enough to properly compare them, but I was definitely happy with the P2B a few years ago. I think I might be having an AGP problem on the Gigabyte, but I haven't worked with it enough to blame the chipset yet. For all I know, the card could be bad.
If you don't want to mess with capacitors, then keep the Asus. The Gigabyte GA-6VXD7 has cheap caps from the factory. If the originals are still in it then they need to be changed. The Asus P2B variants all had good caps.
If that's not an issue, then it really comes down to what chipset you'd rather have. The GA-6VXD7 is a VIA 694X (Apollo Pro 133A). The P2B boards are the 440BX which everybody knows and loves.
The 694X has some feature advantages but maybe none of them matter to you. If you're using the same level of features on either chipset, then the 440BX is certainly more highly thought of. The reason for using a 694X would be if you want the added features.
- The 694X officially supports 133FSB. 440BX does that through overclocking, but I'm not sure how reliable that is with a dual CPU P2B-DS board. I've only ever had one of those and it didn't clock anywhere close to 133MHz, but that could have just been bad luck. I think single CPU boards clock more easily than duals do.
- The 694X board will support 512MB PC133 modules, the 440BX supports up to 256MB per module. They both support registered memory and ECC.
- The GA-6VXD7 has a Universal AGP slot, the P2B-DS is 3.3v only.
Advantages for the Asus:
-If you'll be using the same bus speed either way, then the 440BX is faster. Not sure how much.
-It's slot-1. Personally I like this way better than socket-370. Even though you're using slockets, at least if anything tragic happens, you'll only have to replace a slocket and not the motherboard.
-AGP on the 440BX is trouble free, where VIA is famous for issues.
-The Asus has good capacitors, as mentioned above. The Gigabyte GA-6VXD7 doesn't. This is a big deal unless the Gigabyte caps have already been changed, or you plan to do it yourself.
-You already own it, so you know it works correctly.
From your post it sounds like keeping the P2B-DS makes more sense. It doesn't sound like the features of the 694X would be of much use, except maybe the official 133FSB support.
