Firstly, sorry for my not quite perfect english 
My system specs:
i7 7700k - default clocks (4.2)
motherboard asrock z270pro4
PSU 750w OCZ
DDR4 2400 cl 17 default
GTX 1060 6gb
So, my problem starts when my PC shuts down completely while watching youtube/brousing. Just shuts down, without bsod or error.
Then begins the troubleshooting.
In most of stress tests system rock solid stable (intel xtu, x264, cinebench, etc), but not in prime 95. On stock settings, system crashes within 1-5 minutes of test 100% of the time.
First of all, i shoud say that i tried a lot of possible combinations of cpu frequency/memory frequency/vcore/vram.
My memory seems to be stable after night of memtest, so I put aside memory problem theory.
After quite some time, I discovered that if I drop my CPU clocks to 4000 from default (4200) i can pass prime easily. Further investigations lead to AVX problems - if I turn off AVX in prime using CpuSupportsAVX=0 command, system seems to be stable again.
So i went into bios and set AVX offset. Right now im surprisingly stable at 4500mhz with 5 avx offset, so i can pass prime at 4000 mhz and every other benchmark at 4500.
So, what the hell? Why CPU not even stable at default clocks?
We are not talking only about prime95, remember how it starts - instability when brousing yutube videos (chrome and youtube uses avx?).
Could it be something else? Should i calm down and live with 4.5 and 4.0 avx ? Who knows, maybe I will crash again at some point of time... Could it be overheating (cpu temps fine in 70-80 range bbut idk about vrm's) or PSU or motherboad problems?
Also, is this okay to turn off AVX support completely thtoug bcdedit /set xsavedisable 1? because right now i have a lot of time in games when cpu drop speed to 4000. Any disadvantages of no AVX at all in gaming?
My system specs:
i7 7700k - default clocks (4.2)
motherboard asrock z270pro4
PSU 750w OCZ
DDR4 2400 cl 17 default
GTX 1060 6gb
So, my problem starts when my PC shuts down completely while watching youtube/brousing. Just shuts down, without bsod or error.
Then begins the troubleshooting.
In most of stress tests system rock solid stable (intel xtu, x264, cinebench, etc), but not in prime 95. On stock settings, system crashes within 1-5 minutes of test 100% of the time.
First of all, i shoud say that i tried a lot of possible combinations of cpu frequency/memory frequency/vcore/vram.
My memory seems to be stable after night of memtest, so I put aside memory problem theory.
After quite some time, I discovered that if I drop my CPU clocks to 4000 from default (4200) i can pass prime easily. Further investigations lead to AVX problems - if I turn off AVX in prime using CpuSupportsAVX=0 command, system seems to be stable again.
So i went into bios and set AVX offset. Right now im surprisingly stable at 4500mhz with 5 avx offset, so i can pass prime at 4000 mhz and every other benchmark at 4500.
So, what the hell? Why CPU not even stable at default clocks?
We are not talking only about prime95, remember how it starts - instability when brousing yutube videos (chrome and youtube uses avx?).
Could it be something else? Should i calm down and live with 4.5 and 4.0 avx ? Who knows, maybe I will crash again at some point of time... Could it be overheating (cpu temps fine in 70-80 range bbut idk about vrm's) or PSU or motherboad problems?
Also, is this okay to turn off AVX support completely thtoug bcdedit /set xsavedisable 1? because right now i have a lot of time in games when cpu drop speed to 4000. Any disadvantages of no AVX at all in gaming?
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