Q6600 + Ultra 120 Ex..... high temps?

[simonnance]

Put together a comp for a mate of mine, nice Q6600 that should be adequately cooled by a Ultra 120 Ex + 1600RPM SFlex, however at stock (2.4Ghz, 1.28V) its hitting 45C idle and 60+ Orthos load.

is it a bad mount, poor heatsink flatness, or just the fact that Quads run quite hot?

Thanks!