ram limits for k8HTB

Hey all,

I will upgrade soon enough. But, I would like to get some ram now that I
can use on an upgrade (939 board, AMD 64 X2, Pci-e) etc...

Can I replace my two sticks of pc3200 with pc4200 ram and use it on my
current board? I understand I will be not getting its full benefits, but
thats fine for now. I occasionally overclock and my generic ram is my
limiting factor. I assume the 4200 ram would help in that regard some.
Right?

Thanks group,
SL