I am stoke at +80 mhz but all my indicator are low. No over heating no use all my power . So why the overclock crach at 90 mhz i got 68 degree maximum and 112 % of power no artefact but crach power supply gold 760 watts. Bios slave is used.
 
Card name: NVIDIA GeForce GTX 1080
Manufacturer: NVIDIA
Chip type: GeForce GTX 1080
DAC type: Integrated RAMDAC
Device Type: Full Device (POST)

Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_ENUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 16240 MB
Dedicated Memory: 8079 MB
Shared Memory: 8161 MB
Current Mode: 2560 x 1440 (32 bit) (144Hz)
 
System Information
------------------
Time of this report: 11/13/2018, 22:36:48
Machine name: JESSY-PC

Operating System: Windows 10 Famille 64-bit (10.0, Build 17134) (17134.rs4_release.180410-1804)
Language: French (Regional Setting: French)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: 1302 (type: UEFI)
Processor: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz (8 CPUs), ~4.2GHz
Memory: 16384MB RAM
Available OS Memory: 16322MB RAM
Page File: 11782MB used, 11963MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 12
DX Setup Parameters: Not found
User DPI Setting: 96 DPI (100 percent)
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Not Supported
DxDiag Version: 10.00.17134.0001 64bit Unicode

Lets ask these questions - what are you using to OC with and besides the +** numbers what are the actual stable clocks say if you set +50 - what are the clocks?

2080 MHz.  That is pretty good.  If you overclock too high, it will crash.  That is what is called instability.  How high you can overclock is dependent on the "silicon lottery".  Most of these GTX 1080's max out around 2100 MHz.  You are right there at the average overclock limit.