Hey folks, I have an odd problem involved with Maximus viii hero CPU upgrade from 6600k to 7700k.
It works flawlessly previously with 6600k. When upgraded with 7700k, it posted initially for bios setup. But after save and reboot it stuck with code 63, no posting. I spent the whole night to figure out if I manually set the ram to 2400 or below it is able to boot into windows with all the OC settings lost. Intel XTU also has the OC setting grey out and under stress test it can only run no higher than 4.4ghz 56w. In comparison, the 6600k can do 4.8ghz 120w without a problem on the same board. I did find another 7600k to test and the same thing happens again so it definitely goes with the mobo.
Also want to mention I tried all five bios versions I can find on asus website that supports kabylake CPUs.
Best regards!
It works flawlessly previously with 6600k. When upgraded with 7700k, it posted initially for bios setup. But after save and reboot it stuck with code 63, no posting. I spent the whole night to figure out if I manually set the ram to 2400 or below it is able to boot into windows with all the OC settings lost. Intel XTU also has the OC setting grey out and under stress test it can only run no higher than 4.4ghz 56w. In comparison, the 6600k can do 4.8ghz 120w without a problem on the same board. I did find another 7600k to test and the same thing happens again so it definitely goes with the mobo.
Also want to mention I tried all five bios versions I can find on asus website that supports kabylake CPUs.
Best regards!
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