Hmm didnt notice the sd964 was different, it wqas tested with the same cpu but different mobo+RAM. Scan dont have the 964 only the 963(3 heatpipes) so will checkebuyer etc but if i find the sd1283 cheap ill get that. Was there any difference from the 1283 and the 1284? id expect the latter todo better with 4 heatpipes instead of 3 but it performs slightly better on load and worse on idle.