K6-2 is the third fastest series ever producer for (super)socket 7. There was Chomper and Chomper Extended (CxT). The latter has three ability to run at a 6x multiplier, making 66x6 = 400MHz possible. Ideal for a Socket 7 that does support the voltages, but does not run stable at higher FSB.

The was the faster K6-3, a K6-2 CxT with onchip L2 cache, making motherboard cache L3 cache.
The K6-2+ and K6-3+ (Note the plus!) we're similar to the K6-3, but had a die shrink, making them run cooler and may overclocking to over 600MHz.
The K6-2+ was basically a K6-3+ with less L2 cache, obviously losing a little bit of performance (but still put the Pentium 2 to shame)

The K6-2 and higher can be clocked back enough to make sensitive 386 games run acceptable. Especially when coped with a TNT2 of Voodoo 3 graphics card, which have excellent vesa support.

What motherboard do you have? Does it support the right range of voltages for K6-2/3? (and maybe K6-3+)?
Does it have AGP?
What K6-2 do you have?
Ram, graphics, hard drive?