Thanks for the thread Cyclops,
I'm in a similar boat as you regarding temps, setup, and voltages. I too don't have a great 4770K.
Right now I have an L311B chip (from memory) de-lidded using the blade method.
Antec Kuhler 920
Gryphon TUF Z87 which arrived with BIOS 0311 and updated to the latest
Corsair DDR3-1600mhz 9-9-9-24, run at both 1600 and 1333mhz
CLu between IHS and die, and Vaseline covering the surface mount resistors. Hey everyone loves Vaseline
Arctic Ceramique 2 between IHS and Kuhler 920
My chip is at 1.29 volts at 4.4Ghz. I can't run the AVX LinX or IBT binaries at this speed in Win 7 x64 SP1. Temps (even after de-lidding) hit 100C within 30 seconds and the chip throttles and it fails the test soon after.
I don't know why the AVX binaries hit this chip so hard. Power consumption with only the board, Kuhler, OCZ Vertex2 and built-in HD4600 graphicsand two sticks of 4GB hit nearly 230 watts at 1.35 volts and still no stability. Pretty crazy. Evan at 4.4 @ 1.29 or 1.30V I'm seeing over 200 watts power usage on my Kill-A-Watt.
Prime95 is fine, I always start with 256 size FFTs and I saw a temperature reduction of around 12-14 celsius (going from memory) from pre-de-lid from 94 celsius down to 81-82 for the CPU package in HWinfo.
By way of comparison, my 3770K at 1.38V de-lidded with a Kuhler 620 runs 4.9 Ghz all day and can run these IBT and LinX Linpack AVX binaries at less than 80 celsius.
I will try your trick of turning up the VCCin and possibly reduce cache speeds to see where I can take. Initial Haswell seems VERY inconsistent.