Did you delid it? If not, you might run into high-temps with the voltage above 1.3v and by that be limited. When you clock it at 4.6ghz+ does it crash imidiatly when loading windows or is it just too unstable to bench/game?
It shouldnt be that hard to reach 4.5Ghz. After loading optimized default just go to the OC menu and adjust those lines below:PCIE PLL: LC PLLFilter PLL: EnableAdjust CPU Ratio: 45CPU Ratio mode: DynamicCPU Core Voltage: 1.2v (if it crash in Windows, you can up it until you reach 1.25v, if it works with 1.2v, you can try to lower it to keep it cooler)Core Voltage mode: AdaptiveYou have to adjust CPU Core Voltage, until you reach stability - going above 1.25v require a...
I mean, sometimes after bios updates its nessesary to do a complete bios reset. The button for that are located under the ps2 port on the motherboard. To do the reset, unplug your powercable, press and hold the bios reset button for like 10 seconds and afterwards plug powercable again and turn it on. Then you bios is then completely wiped and you will have to open it and load optimized defaults. After that you can start overclocking and I think your problem will be solved.
Not everybody can run Super PI at 5Ghz on air, considering that the chip are better than average. I dont think its golden. I dont have that much experience with haswell, but mine seems to be around the same quality.
The reason for paying a bit more than stock for this, should be that you are kind of guaranteed that it can do 5Ghz and maybe more, where a brand new untested chip is kind of a chance.
I think it can go for more than stock price on 4770k for a person that will overclock. With this chip you are ensured that you can go above average. Some people are really put of luck, and it will make sense to for them. Not sure how many people will do it though.
Seems that CPU PWM has been updated in latest B7 beta bios. Now we can switch with up to 1Mhz. I think top was like 400Khz before. Further more there are now 3dmark01 bench enhancement in bios, if someone here are benching hwbot.