Xp2700 w/ pc2100 memory

Not sure if this is the right place for this, my wife has an nfs board, right now it has an xp2100 using that memory pc2100, i have a xp2700, will it work with that memory.

It will work yes but certainly not optimally as the 2700+ is rated at 166FSB (166 x 13)and your RAM only to 133FSB so quite likely it would be underclocked (to the maximum the PC2100 can withstand). If you already have the 2100+ overclocked then as both have a 13 multiplier (13 x 133 v 13 x 166) then its unlikely you will have much upside unless you improve the RAM or have the ability to manipulate the 13 multiplier higher.

The xp2100 is running stock right now , when i had it , it was overclocked to 2.2 but i was using the memory that i am using with my xp2600 right now. Would the xp2700 be any kind of improvement? or should i get some pc2700 memory for it. thank you

I am pretty sure you can manipulate the multiplier on the 2700+ (they were all manufactured before the "cut-off" date AFAIK but you can check on the cpu itself anyway). So if the board supports multiplier manipulation which I think it does if you have the abit then you can up the multiplier rather than the FSB for higher frequency (eg 16 x 133 is quite close in terms of frequency to 13 x 166) - although obviously bandwidth improvement is limited compared to the 2100+.

OC Detective Thank you very much. What about vcore could that stay at 1.60?

You're lucky if you can even OC it to 150 mhz stably.
Because before I gotten PC2700 DDR SDRAM, I couldn't get the RAM higher than 150 mhz.

Most PC2100 DDR SDRAM probably max out at 150 mhz and likely less.

Also, the stock Vcore on the Athlon XP 2700+ is 1.65V, AFAIK.

It was 1.60 for Athlon XP 2000+ and lower, AFAIK.

Thats entirely dependent on if you want to overclock with the cooling you have.
At the setting I mentioned the cpu is not overclocked so stock voltage should suffice (for the 2700+ its 1.65v).