This setup is in a Cooler Master HAF X, so I'm getting great air flow.
I was using a Z68 SLi motherboard and scratched the back side of the pcb right by the second slots of memory and killed those slots. I was running my i5-3570k cpu in it at 4.2Ghz on a EVGA cpu cooler and never broke 67°C on any core with Intel Burn Test. Great cpu, runs 4.2Ghz at 1.65v vcore completely stable per Intel Burn Test going through an 8Gb memory test.
Anyways I picked up a Z75 SLi motherboard, running the same cpu at the same speed and same voltage the temps are reporting out the roof. So I put a Corsair H80 liquid cpu cooler on it and still the temps were out the roof. The cpu itself was hitting 82°C and the cores were in the upper 77°C and I stopped the test before it got worse. So I got a Corsair H105 liquid cpu cooler. I got the exact same temps with it, had to stop the test. So I went full blown water cooling setup. Swiftech Apogee HD cpu block, Swiftech MCP655 pump, Swiftech MCR220 Rad with 2 GentleTyphoon AP-15 fans, 1/2" tubing and PrimoChill Ice Clear coolant. I'm still getting the same temps reported via EVGA E-LEET and most recent version of AIDA64 and have to stop the test as I don't want to kill the cpu.
What's the chances of a Z75 Motherboard Reporting the Wrong CPU Temps?
BTW: AIDA64 doesn't report the cpu vcore correctly on this motherboard, it shows the voltage much lower, first time I've ever had that happen. EVGA E-LEET shows cpu vcore voltage exactly as the bios shows.