I question the chip at this point.
Did you purchase the Intel Performance Tuning plan? They will allow RMA for overclocking-related issues only if you buy this...cost me $25. Covers the 3-year warranty period from purchase for a one-time OC related failure/issue. Might be worth considering, I had issues with my CPU...the replacement was MUCH better.
If you have the newest BIOS, and everything is stable stock...ideally you should hit 4.2-4.3GHz on stock or +.010v. That's been my experience with most 4670k's I've been asked to OC.
I don't mess with many of the in-depth settings anymore..I have found with newer bios versions on my Asus board that I cannot find better stability with manual tuning. I do, however adjust CPU input voltage (I do leave the monitoring set to AUTO so I can see wattage consumption), I adjust Core voltage, I leave my cache voltage on AUTO since it stays at stock and stays stable at 39x (I might be running 40...I believe 39 now tho...but it has been shown even that doesn't do much). Set the memory to XMP profiles, and also try manually setting specs.
You shouldn't need to modify half of your settings in Bios for such a simple overclock IMHO. And, 1.30v and still unstable at 4.3Ghz, that's no bueno. Really beyond using XMP settings for ram and adjusting your multi's and basic voltages, you should be there by now IMHO.
My settings:
- XMP for my G.Skill 2133, manually adjust voltage to 1.58 to read 1.60v.
- CPU voltage set to 1.156v or 1.150v
-Max multi set to 43
-Cache set to min 8x and max 39 (or 40)
-Cache voltage set to auto
-CPU input set to 1.71v
-Monitored Input or whatever the setting is, I leave on Auto... Asus notes that disabling it helps OC-ing...the only thing I notice is that I lose wattage readings in monitoring applications for CPU/Core/iGPU. So I leave it on.
-I'm fairly certain that's about all I adjust anymore...I tried other settings and ended back to auto on many of them.
I have OC'd on Asrock and Asus boards, and so far haven't had many issues...the worst was my first 4770k. I had similar issues at 4.3Ghz iirc....check out the Haswell OC thread in the first several pages...I'll be in there. You might ask for help there and see if you can get Cadaveca's suggestions, he's been a lot of help to many OC-ing haswell cpu's.
I fought my chip for close to 6 weeks before I replaced it. I tend to use OCCT 4.x's CPU and PSU tests for 1-6 hours. AIDA too. I like OCCT because the PSU test covers so many aspects...and the CPU test has AVX tests as well iirc. I like the timer, sensor tracking and reporting.
I think you may have a lesser capable part than average for overclocking though. A different board or CPU would let you know for sure imho.