Did u play with other apps during LinX in the background?
Background processes that seem to only use a tiny bit of proc power can have a big impact on GFlops.
Other than that suspect ur OC is unstable. A good OC with nothing interfering with IBT or Linx will maintain consistent GFlops within one flop from minimum to maximum. btw, the latest version of LinX (provided in Post#1)on win7 SP1 should yield 100+ which is the real deal for SB.

ermm my sabertooth p67 comes with eatx 8pin but it seems my silverstone psu comes with only atx 4+4pins

i read some forums that just 4 pins is enough

or must use converter?

r u serious bro??erkhh..just brought dz mobo last 2 days...my sabbertooth P67 sent to claim d waranty last week...mean d sabbertooth can OC rite?its P67