its weird when that happens, but I ordered some "slot t" tualatin slockets for Dell Gx-1's...when I build my old dells I always put the newest bios on em, which is "A10".....strangely the slocket wouldnt work till I went back to A07, lol....I never would have had a clue 'cept I read it in a reseller rating review, lol.
I also had tried a socket 370 fcpga to tualatin adapter which didnt work, but after I went to the A07 bios I went back and tried it and then IT worked, lol.
Strange cuz they always tell ya to go to the latest bios