I had one of those boards, very nice. I may still have it stashed away some where....
I was running the K6 series chip in it, could only run 66mhz and 75mhz FSB speeds so the most I could get was 300mhz. I had a K6/233 running at 75x3.5 for 262mhz, and managed to push a K6/266 to 300mhz, but not real stable.
As for the K6/2 series, you won't be able to run them because your core voltage will not go low enough. I will check to see if I still have a manual around for that board....
Hope this helps a little.
Main DVD MM Rig:
CoolerMaster Storm Scout
AM3 Phenom II x4 955BE @ 3.6 ghz
Corsair H50 Watercooling kit
4.0 GB AData DDR3
GIGABYTE GA-MA770T-UD3P Mainboard
Western Digital 750GB 7200rpm w/32mb cache
Samsung 750GB 7200rpm w/32mb cache
Western Digital 1.0TB 7200rpm w/32mb cache
LG 20x DVDRW-DL "SuperDrive"
PNY GeForce 9800gt 1024mb w/Samsung 245BW 24" LCD
Corsair 620w Modular Power Supply
Logitech z-640 5.1's
Logitech Wireless Mouse
Win 7 Ultimate........