7990 reaches 99C within a few minutes ... cause for concern?

[Treggar]

might be obvious, but you check if the fins are clogged with dust?

[zeuzzz]

I have 2 x 7990s.

I get 2800 MH/s.

Only got 2100 MH/s for the first 2 weeks, then my son did something to get the 2800 MH/s.
If you're interested I can ask him what he did.  He is watching a film just now.

Yes please, im averaging 1300 mh/s at 85C. Thats with the core voltage down from 1200 to 1060, anything lower just crashes my screen.

[zeuzzz]

might be obvious, but you check if the fins are clogged with dust?

Its a pretty much new card, less than a month old, so they are clean. Are there other ways other than decreaing core voltage to lower temparature without effecting mh/s? I've opened my case and have a fan blowing at it, which makes marginal difference, so it's not a casing issue.

[SheepOnDrugs]

Changing core voltage doesn't affect hashing speed.

[zeuzzz]

Hmm well unless I decrease the intensity (I -13 to I-12) in cgminer its still running at 85-99, it fluctuates quite a lot daily between these two.