Haswell i5-4670k mild overclock crash, bad CPU?

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Aug 21, 2013
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About two weeks ago I bought the i5-4670k CPU from microcenter. I've heard about the hit or miss performance of haswell, and it's not looking good. I build my PC last week I have:

MSI Z87-G45
i5-4670k w/ Noctua NH-D14 air cooler
8GB G.Skill Ripjaws X 1600MHz
Evga GTX 770 SC

I got CPU-Z, Prime95, and RealTemp to start, and with the stock settings I was at 1.19V running at 3.8GHz I guess due to turbo boost. I set my OC to 4.2GHz for CPU core and 4.1Ghz for ring ratio. I then set the voltage to adaptive and set it at 1.050V for core voltage and 1.025V for CPU ring voltage and loaded my XMP profile for my RAM. When I reset the computer I was sitting at about 1.19V at idle and as soon as I fired up Prime95 it jumped to 1.240V and the computer froze and crashed...

Not sure if I did something wrong in the settings, or I just happen to have a bad haswell chip, and if so any idea if I'd be able to exchange it at microcenter?

Thanks
 
your haswell is undervolted. you're going to need to bump up the vcore a little.

some tips on crash types...
1) freeze/lockup crashes = undervolted cpu or overheating cpu
2) black screen restarts = undervolted cpu
3) BSOD restarts = ram issues or undervolted cpu or overheating cpu
4) programs crashing to desktop, or cores failing in prime = undervolted cpu

those are the main things. if you see any of this it's your cue to bump the vcore a little on your cpu.

*note: haswell like most modern cpus will "throttle" down to prevent heat related crashing. Heat related crashes are extremely rare; so do not assume that it is high temps causing a crash unless you have exhausted all other options.
 
What is a safe voltage to never go over using haswell? I assumed 1.2V is pretty much the max and correct me if I'm wrong but crashing at 1.24V while only at 4.2GHz I am not sure I can go any higher.
 
mmm... generally speaking around 1.25v temps start to run out of control for haswell... though there are people who can get those chips up to 1.3V or more... it would take a better cpu cooler then most people have plus some delidding to do it.

basically you'll overheat a haswell before you hit unsafe voltages... mmm... how about you double check your ram with memtest86 before you go any further. lets nail this problem down.
 
I decided that to exchange my CPU and assumed I just had bad luck. It turns out that's exactly what it was because I'm stable now at 4.4ghz with 1.24v and my temps don't go past 60 C with prime95 100% load, so I'm pretty happy.
 
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