I have a Sapphire 3850 AGP from ~2008, and I've recently resurrected it in a Sony Pentium 4 desktop with a 2.66GHz P4 @ 3.0GHz/150, 2GB Corsair DDR RAM and the original ASUS P4S533-VL (SiS 651 motherboard). Obviously, this system is a huge bottleneck, but I have been playing with my card and have it at 700/1000 @ 1.134v. 750MHz crashes even at the next voltage step, and by then the card runs pretty hot, so I'm fine with my current frequencies. Also the PCB under the VRM area is discolored brown so I'm taking it easy considering I have some new boards on the way.
Anyway, I just discovered Geeks.com and their selection of ancient refurbished boards for $25 a pop, so I literally bought 5, yes 5, refurbished boards to play with, since I have no common sense.
ASRock P4VM890 (installing 2.6GHz/800 P4 and random DDR)
ASRock K8NF6P-VSTA (Installing 2.4GHz 256K Athlon 64 and random DDR)
ASRock AM2NF3-VSTA (Installing 3850 AGP + Phenom 9750 + random DDR2)
ASRock 4CoreDual-SATA2 (Installing BFG 7800GS + E6400 + random DDR2)
ASRock 775XFire-VSTA (might stay in the box for a while)
Probably going to stick with XP on most of them. Hopefully the NForce3 250 board isn't going to be a giant problem with XP, as I'm sure Vista or 7 may have driver problems with the chipset. At $25 each I don't really care if they go up in flames in a month, but hopefully they don't.
Speaking of drivers, anyone know of any 3850 hotfix drivers that don't suck balls? I literally can't even launch 3DMark03/06 on this rig with the 12.1 XP hotfix drivers, which is completely retarded.