My experience with all those freeware thingies (perhaps except rambooster) is that they usualy not realy help your box run smoother. I have seen several pc's with all kinds of such 'super' software to run better, faster and when you switched them off you had... more ram free and a faster pc than with them. So many of those progies take more cpu time and ram than they can make free for you. The sum of what you win and what you lose sghoudl be positive but in many cases it isn't.

Jinxy an oc from 550 to 630mhz is a nice oc, it means almost 15% faster.
netspyder a step that sure will help is increase your amount of ram from 128 to 256 Mb.
also here's a link to K6-II utilities for running on win9x boxes: http://pksun1.publikompass.it:80/htm...468x60&pp=topc
don't know if they are usefull for you, probably not but you never know.

The K6-400 you have is probably a AMD K6-II 400 manufactured with a 0.25 micron architecture at FSB 100 mhz, these cpu's are generaly in the lower mhz ranges good overclockers cause the architecture permits higher cpu speeds. For your cpu you generaly have two choices with a 100 mhz FSB mobo (make sure your mobo and components run at 100mhz front side local bus). Keep your FSB at 100mhz and multiply with 4.5 instead of 4 this will give you a cpu spead of 450mhz = 4.5x100 mhz
Another possibility is to lower the FSB to 95 mhz and multiplier to 4.5 this setting delivers 4.5x95mhz = 427.5 mhz
keep in mind that overclocking your box shortens the lifetime of your cpu and possibly other components due to a higher load (read temperature). If there's oen thing cpu's and mobo don't like then it's a high temperature. So when your older overclocked box freezes constantly or even blanks out you are possibly burning your cpu

However if your cpu is a AMD K6-III 400 then it's more difficult to overclock. This is cause the K6-III uses a relative high core voltage, and when the core voltage increases the temperature also increases. This means that you don't have much room to overclock. Specialy since the core temp and default voltage are already high in a standard config. Keeping in mind the bad heat dissipation of this kind of cpu it is still possible to get something like 500mhz out of this piece of technology. (Always ensure good cooling or you will fry your cpu). You can reach 500 using a multiplier of 5 and 100mhz fsb. Or 95mhz fsb and 4.5 gives you 475mhz core speed. In the case of the AMD K6-III it's more interesting to obtain a higher core speed than bus speed since it's level 2 cache depends on the core speed. So if you increase the core speed your L2 cache fastens too, this is cause it's integrated. The L3 cache is not integrated and therefor does not have a meaningfull performance increase difference between the two possible overclock options.
However an overclock is not always the adviced way to get that slightly more speed.
Like I said before an overclock means a shorter lifetime to your cpu this is due to electro migration. Electro migration is directly related to the heat within the components electronic circuits. When you oc a cpu the heat is goign to increase cause of the higher frequency the cpu is working at, in many cases to keep the box stable, you have to increase the voltages (for example the core voltage), causing more heat. More voltage is always more heat and more heat means instability and more electro migration. More electro migration means a shorter lifetime. However lifetime of a box is relative I have several 80386 cpu's that still run, so perhaps I should have clocked them higher almost 15 years ago?