Ok so there's something with the board. I tried 2 other brands of memory (Crucial and Corsair) the exact models "guaranteed to work with my studio xps 8100" and it does the same exact thing, reboot loop if i use all 4 sticks, freeze on startup if i use only the new memory... The memory is rated at 1.5V so there shouldn't be any BIOS adjustment to make (not that i could, it seems to be locked anyways) So now i'm really stumped. This memory is "guaranteed" to work with my model which should be able to take 4+4+4+4G ram (dosen't even work with 4+/+4+/) i really don't know what could be the issue now.
Anyone has some ideas ?