Ya, just installed it, I really notice a difference, it was kind of a pain up the a** to get it to work good tho, at firts when I powered it up it only showed up as 1000mhz then I found out that the MB i bought was 100mhz fbs and my processor 133, so after messing with the bios I got it upto 1.26GHZ which wasnt fast enough for me, so I put it back, read the manual and found out how ot change the multiplier on the board (dip switch) so I put that on 12.5X (MAX) and it went to 1.3ghz which was OK with me. Temperature at 46C CPU and MB at 33C!!!! With a standard heatsink and a Delta DC fan high RPM on top of it + 2 side case fans.