I am struggling making a decision whether to get a q6600 wo/SSE4 or the $120 more expensive q9450 w/SSE4 instructions. Ive read that the SSE4 instructions can speed up the encoding process up to 105%, which I am skeptical about. I will be doing alot of x264 and xvid encoding on this new machine that im putting together and im wondering if anyone has ever seen a major difference in encoding times like Intel claims.