780i + e8400 overclocking heat ok ?

Stock speeds i'm getting at idle according to CPUid around 39c ... 55c loads

At 3.6, 1600fsb its going around 48c and loads maxed at 70c running ... Can i trust these temps and take this as my heatsink might need to be reseated ? .... or is this normal for this chip ?

I'm running the evga 780i board with 2x2g g.skill ddr 800 which is running linked to the cpu speed ... no issues .. just temp concerns ... Arctic silver 5 and on top of that is the xigmatik 120mm heatsink/fan ....

Should temps be lower?

I know 70c is on the warm side, but again .. its during load ... I just don't wanna burn up my chip quite yet .. i'm even thinking of going water cooling if this problem keeps up ... i'm in an office with no windows in my basement/gaming room ... Smilidon case, plenty of fans ...