Last week I bought a new CPU, motherboard and RAM.
It ended up being a i7 6700k, a Asus Z170 Pro Gaming with G.Skill Ripjaw IV 16 GB DDR4 2800Mhz set.
Installed everything, did a first start = everything was worked fine.
Next did a BIOS update, update went without a hitch so no problems there.
Then restarted and started tweaking the CPU and RAM.
Got the i7 6700k running at 4.4GHz on all cores and got the RAM to work at XMP profile.
It all was working fine until last Saturday when I change the CPU cooler for a new one (a Scythe Fuma)
That's when excrement hit the air circulation system.
First the PC didn't want to start up, it hung before it finessed POST.
Check the LED's on the motherboard and it hung on RAM.
Next I did a hard reset on the BIOS (removed the BIOS battery for a couple of seconds) and after some doing finally got the motherboard to except the RAM modules again.
Checked the RAM modules with memtestx86 and they passed the test without problems.
But since then I have not bin able to get the system stable.
Not with a slight overclock, not even with all optimal values.
9 out of the 10 times when you start the system cold it will not boot, it'll hang during POST.
When you reset (push the power button 10 seconds and start again) it'll show a overclock fail.
When the system does start as it's suppose to and you restart it (even after a couple of hours) 9 of the 10 times it will hang during POST.
Another thing which is noticable is when the system starts it takes a long time to get passed POST
What I found out is that for some reason or another it doens't seem to like the XMP profile.
Next, even with the optimal values from the BIOS loaded (so no overclock what so ever) , when you do a benchmark run with XTU it puts way to much voltage on the CPU (1.44v when between 1.35 and 1.4v is the maximum for 6700K's)
Because of the over voltage the CPU gets it will heat up to 70 degrees within a couple of minutes, the PCH will heat up to 70 degrees within a couple of seconds
It even over voltaged the RAM modules (1,5v will the only need 1.2v)
The things I've done till now :
Check the motherboard and CPU for burn marks, if the CPU was bent, if the CPU was seated on the motherboard correctly.
Loaded XMP, put a fixed voltage for the RAM modules, put CPU Core/Cache voltage on adaptive.
Manually input the RAM values (so not using the XMP profile)
Put USB legacy on disabled
Tried to do a rollback with BIOS to version 1904, the motherboard didn;t accept it, said the BIOS was incompatible with the motherboard.
All of this is hit and miss :
Sometimes the system starts without a hitch, most of the times it will hang during POST and when you reset it will show overclock fail
When the system does startup normally it works fine in Windows and there are no problems when you're gaming.
I understood from reading the forum the last couple of days that a long POST boot up is quit normal for Asus Z170 motherboards
Does anyone have any idea was wrong here ?
I thinking that either the motherboard or the CPU (maybe both) are failty...
Here's my setup :
Intel i7 6700K
Asus Z170 Pro Gaming
G.Skill Ripjaw VI 16GB DDR4 2800Mhz
Gigabyte GTX 1080 Gaming G1
Creative Soundblster Z
Intel 750 800GB PCI-E SSD (boot and games disk)
1 4TB Western Digtal 5400rpm harddisk
2 6TB Western Ditial 5400rpm harddisks
Corsair RM750X power supple
