after taking a look at bill1024's timings, i also managed to get 8-9-8-24 running stable,
but overall 1333 CL6 (6/1333 = 0,0045) seems to be the better deal, than 1600 CL8 (8/1600 = 0,005).
Getting 1600 CL7 (7/1600 = 0,0043), like on my other build, would have been perfect,
but i guess the gene with the x5600 series doesnt want to go at it, like the formula with the x5500 series.
Now im thinking, if i should swap the the x5570 with the second x5675 (since i got a matched pair of them for a great deal), as a further upgrade for the htpc, since it also might have better temps.