I just put this in my quicksilver and after some time it is working now. I had to take out a scsi card that I was not using due to major conflicts. It will not clock to 1.4 but will clock to 1.26. Only in the about my mac it says dual 600. Weird. But I know it is not at 600(I ran xbench and got a 156) Anyone know why? Also is there anything I can do about not being able to get it to 1.4?