You will have to look to see if your RAM is PC100 or PC133 before you can make judgement on this.
If it is the latter, then you can adjust the frequency to 133 and you will get a slight perfomance boost (hardly noticeable). As for the processor, leave this at 100mhz. The motherboard switches should be set to a x9 multiplier, however, with this athlon you can overclock it to x10 to make it a 1ghz but with a 900 mhz CPU, do you really want to.
Eradic8or.