ok so I thought I bought an inspiron with a 8600m GS, vista, GPU-Z, sis-soft all report it a 8400m GS 128mb card including bios. I bought a 8600m GT ebay installed it and the BIOS and vista and all other programs still see it as a 8400M GS. Is there a reason for it doing this? The p/no ties up to be the 8600m gt 256mb but pc wont install it as that... p/no: cn-0yy636-70091...... can anyone provide any assistance before i send this new card back?