I don't think there is much of a point in overclocking a K6-2, especially nowadays. If you want higher performance with that board, look for a K6-III+.
Since the SY-SSM seems to have some FSB setting above 100MHz it might be interesting to use a higher FSB without raising the core clock much, a K6-2 should gain more from a higher FSB than from higher core clock. If the higher FSB will be stable is a different question. I don't know how stable K6-x CPUs are with higher FSB's, but at least the board allows you to use sane clocks for PCI and RAM.
Do you have an AFX or an AHX model?

It is the AHX model. I did look into getting a k6 3 but I don't know how much better it is. I'm kind of new to socket 7 amd CPUs. I mostly have Intel mmx and 1 cyrix mx3 I think. I can't think of the name off the top of my head but I think I'm close. It does have a lot more cache compared to the CPUs of its time. I could give that a shot but I think my best bet would be in the k6's

The AHX needs more voltage and runs hotter than the AFX so it is probably not very good for overclocking.
The K6-3 are quite a bit faster at the same clock, the difference gets bigger the higher the clock is - at 475MHz the K6-2's bottleneck is mostly bus speed.
You are right about alternatives, Pentium MMX maxes out at 233 MHz (maybe 250-300 with overclocking), Cyrix CPUs also can't do very high clocks and have slower FPUs so not that good for gaming. Your K6-2 is surely a better choice.

The main difference between K6-2 and K6-III is the L2 cache. K6-III have a 256 KB full speed on-die cache. K6-2 have a bus speed (100 MHz is the limit) motherboard cache.
Unfortunately K6-III cache isn't the best friend of overclockers...

This might be of interest:

AMD K6-2 vs K6-2+ vs K6-III+ Comparison

I really like that 1.6V K6-III+ 400 MHz from that German seller. That chip uses not even 10W and overclocks well. But it's a capable chip on a 66 MHz FSB motherboard as well.

philscomputerlab wrote:

I really like that 1.6V K6-III+ 400 MHz from that German seller. That chip uses not even 10W and overclocks well. But it's a capable chip on a 66 MHz FSB motherboard as well.

Comment regarding the AMD K6-III+:
Just be very careful about the AMD K6-III+ model, it works on much fewer motherboards than the regular AMD K6-III model. Just a heads up that you'll need to be sure it's supported before buying 😀

The regular AMD K6-III works in every board that supports the AMD K6-2 from my own testing.

Agreed regarding compatibility, but the manual even for revision 1.0 of the Soyo 5SSM mentions support for 2.0V and K6-2+ so I'm pretty sure it would work. There is also an official BIOS listed on Jan Steunebrinks page: http://web.inter.nl.net/hcc/J.Steunebrink/k6plus.htm