You can always use faster ram aka DDR400/PC3200

66MHz (Various Celeron and older): 66MHz clock PC66
100MHz (Pentium II / Pentium III / K6): 100MHz clock PC100
133MHz (Pentium II / Pentium III / K6): 133MHz clock PC133
200MHz (Athlon, Duron, Thunderbird): 100MHz clock
266MHz (Thunderbird, XP): 133MHz clock
333MHz (XP): 166MHz clock
400MHz (Pentium 4): 100MHz clock
400MHz (AMD XP): 200MHz clock
533MHz (Pentium 4): 133MHz clock
800MHz (Pentium 4): 200MHz clock
1066Mhz Pentium4 : 266Mhz clock

You cannot use ram thats slower than your FSB. Buying DDR3200 ram will not hurt you but it will only run at the PC2700 speed.

FSB 400Mhz aka DDR PC2100
FSB 533Mhz aka DDR PC2700
FSB 800Mhz aka DDR PC3200
FSB 1066Mhz aka DDR2 PC6400?

Thanks very much for the info!

Paul

Well, I put the PC2700 memory in my GX260 and went into the BIOS and it is still running at 266MHz, and I looked at the processor info and it is running at 533MHz, so I guess this motherboard won't let the PC2700 run at 333MHz.

You can't change any settings that I can see.  It was a good experiment though.  I have another PC I'm not using with PC2700, and put that memory in there.