The BIX micro is the "worst" radiator out there. It's small, sure, but also restrictive, and not so good.
Better are the BIX or the BIXII. Also real good is the heatercore from dangerden (and other places)
It's bigger, but better.
It also depends on how you want to OC. I'm running my 2.8 @3720, but I have 2 heatercores and one BIX...... (and a big tower
)