Hi PottyPete ,, I checked the Gigabyte site and am still confused , it had P4 cpu`s listed but all had a name behind them such as Celeron , Northwood and another one can`t remember , my cpu says Intel Pentium 4 . I am not using the Dell pc , just took the P4 out of it , my Gigabyte mobo I can change the multiplier , the Vcore , the Fsb , the ram numeral , the Agp , the Pci i think it was , so I know I could change this bios to the 21 multiplier , the 133 fsb that the pentium cpu needs ,the gig mobo will suport the 400 or 533 fsb of some cpu`s , just don`t know if my p4 cpu is just plain ole Pentium or is made by say Northwood or someone , when I ordered the Dell years ago I ordered it with the actual Pentium upgrade at that time , I can in the gig mobo change the bios as its not locked and can be modded to the 21 x 133 fsb of this P4 cpu . It suports 400 or 533 fsb cpu`s just not sure on my P4 cause I didn`t know what cpu listing to look for on the gigabyte site ?? thanks Bill