Well... i guess this is proof, as if we needed it, that not all chips will react the same. using your base settings i starting clocking up. was a little nervous around 380 from your experience but i booted windows fine @380 and ran everest stress-test 10 mins to make sure it wasn't a fluke.
continued on to 390 and finally 400 with absolutely no changes to the settings whatsoever. my CPU is even under-volted at idle through droop by .04v
i'll do some stability testing now... i'm sure you're interested in Prime results. used that a lot back in the day with my abit board so i'll give it a go!
i took a screenshot for posterity...
More importantly can you show your bios settings, I cant get this POS to boot to windows with any OC
intel i5 2500k
Asus P8Z68-V
EVGA GTX470
Corsair 8GB Vengence
Corsair HX1000W psu ,
High Speed Tech Station Top Deck,
Dell U2410
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