Hello,
 
I am sorry to hear about the issues you are having. Please go into windows event viewer (run: eventvwr.msc) and look under critical errors.
 
Usually each error listed will have an event ID. Please list any relevant event ID's here.

bcavnaugh
GA-Z97-D3H (rev. 1.0)
2015/09/18 Bios Date Current Number is F9
For rev. 1.2rev. 1.1 and rev. 1.2rev. 1.1

Thanks for that, I didnt know about it but do you really think it could cause the issue?

EVGATech_MDecker
Hello,

I am sorry to hear about the issues you are having. Please go into windows event viewer (run: eventvwr.msc) and look under critical errors.

Usually each error listed will have an event ID. Please list any relevant event ID's here.

This is what google got for me when I copied ID and Source since my windows is in Czech language.
"Log Name: System
Source: Microsoft-Windows-Kernel-Power
Event ID: 41
Level: Critical
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."
Here is more:
"
- System

- Provider
[ Name] Microsoft-Windows-Kernel-Power
[ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}

EventID 41

Version 4

Level 1

Task 63

Opcode 0

Keywords 0x8000400000000002

- TimeCreated
[ SystemTime] 2016-11-03T04:29:45.069282900Z

EventRecordID 6925

Correlation

- Execution
[ ProcessID] 4
[ ThreadID] 8

Channel System

Computer DESKTOP-QMLPLLG

- Security
[ UserID] S-1-5-18
- EventData
BugcheckCode 10
BugcheckParameter1 0xffffe784a1000e90
BugcheckParameter2 0xff
BugcheckParameter3 0x0
BugcheckParameter4 0xfffff800fda69c48
SleepInProgress 6
PowerButtonTimestamp 0
BootAppStatus 3221225473
Checkpoint 0
ConnectedStandbyInProgress false
SystemSleepTransitionsToOn 1
CsEntryScenarioInstanceId 0
"
I know it looks like PSU is cant give enough power for GTX 1070 and it shuts down but why it ran without any problem for almost a year with my 660 Ti? I tried stress tests, benchmarks and everything was okay. Can't be overheating the problem?
Thank you for your help!
 
EDIT: Put back 1070, updated BIOS but because in idle temperature was around 35 degrees i changed fan curve to agressive preset and will see if crash will occur. Right now GPU is sitting on 27 degrees. Is there a way how to check memory temperature? 

The 660 ti & 1070 both draw the same amount of power. To me it sounds like the 1070 is defective since your 660 ti worked fine. Try testing the 1070 in another computer to verify that it is defective.

Sajin
The 660 ti & 1070 both draw the same amount of power. To me it sounds like the 1070 is defective since your 660 ti worked fine. Try testing the 1070 in another computer to verify that it is defective.

Totally what I think. Unfortunately I don't have an option to put it into different PC :( No restart so far tho today, weird =/ 

After 2-3 days first crash happened. I was playing Gears of War 4 for 2 hours cca and it just crashed. When I checked GPU temperature during the game it was around 60 degrees. I'm already sorting out RMA with EVGA so hopefully new GPU will sort out the problem. :(