I don't think your temps are that much out of line. The 920 uses 45nm technology which is hotter than the current 32nm of sandy bridge.
Possibly, your 920 chip might run a tad hot; there will be some manufacturing sample differences.
So it runs hot under stress test. Does it matter?
No, the cpu will downclock itself for protection if necessary.
When testing with prime 95, check the multiplier using CPU-Z. If the multiplier stays at max, you are ok.