Set a new personal best for single core performance in CPU-Z @ 550points with 4.4GHz and the help from eDRAM at 2400MHz. Yes it is stable for the most part, may need at most 0.01v added to vcore but I have yet to have any real crashes in anything (been running for a month so far), for those wondering I will post my current updated voltages and stuff below. Score proof here
Edit 3/1/2019 due to actually getting my RAM to finally run at XMP settings, the settings below are different than what I ran in the test above so no one thinks it was a typo, for the sake of simplicity since I have this post permalinked.
CPU Frequency: 4.4GHz (all cores)
CPU Cache Frequency: 4.0GHz
eDRAM/L4 Frequency: 2100MHz
RAM: Corsair Vengeance Pro DDR3 2400 4 x 8GB (32GB)
RAM Frequency: 2400MHz (dual channel)
RAM Timings: 11-13-13-31 2T
CPU Vcore: 1.4v
CPU Uncore: 1.31v
DRAM Voltage: 1.675v
VCCIN (CPU Input voltage): 1.95v
VCCSA (System agent): Offset of +0.310v
VCCIOA: Offset of +0.205v
VCCIOD: Offset of +0.205v
Load-Line Calibration (LLC): Very High
CPU Temps (hottest core): 83C under extreme load, 71C under normal usage, 30C idle.
Max CPU power consumption: 101W
CPU Microcode (via BIOS): 1D
CPU Microcode (via Windows): No Idea, whatever Windows 10 update gave me.
Disclaimer: These tests are done on a delidded, better binned than most i7-5775C with CLU under the IHS and Thermal Grizzly Kryonaut on the IHS with a Corsair Hydro Series H100i-v2 (240mm radiator) with Corsair 4 x Corsair SP120's in a push/pull config and with an ambient air temp of 21C (70F).