the cpu is a LGA 775, and it is pci-e, i was on a budget and i had 1 gb of left over ddr400 ram so i decided to use it on this build so i use a LGA 775 which supports ddr400, the FSB of the cpu is at 533 stock, so i just moving the FSB to 700mhz, or something like that, (dont remeber and dont feel like going into the bios right now and finding out), and lucky me the lil celeron runs stable at 4ghz, only problem i think i would have with it is the low L1 and L2 cache. the perfromace problem is only with games. i play my games at 1024X768 res, and every thing at meduim-low, with 2XFSAA, and 4XFSAF. i did run games and stuff without anything overclocked and my games just ran slower. NFMW runs fine with a couple slow downs here and their, same with BF2, FEAR lags more than i think it should, and playing oblivion in outdoor areas and in fights really slows down alot.
i upgraded(or downgraded) from a 2.4 athlon64, with a 9600xt, and gig of ram, i ran mostly the same games at the same settings with the only dif being 800X600 res vs 1024X768res. the 9600 had less slow downs, it just shutters less than my x1600, and since the x1600 is like 2 gens newer, it makes me wounder if the graphics card is the one to blame, and how i could make my performace better