Per Core Overlocking Vs Sync All Cores - I7 4770K

[GreatestGamer]

I have a I7 4770K..

Normally my stress test fail very quickly if I attempt to use any form of 'SYNC ALL CORES"
Even 4.3ghz, takes around 1.350ghz to be stable under Sync All Cores.

But when I use Per Core Overclocking, and lets set them all to 4.5GHZ under PER CORE, I'm stable under 1.280 clocked at 4.5ghz all cores.

I know it's probably my chip, as a I recently had a Asus Z87 Plus and now a Asuz Z97 A...so motherboard has been since changed.

What would be different about 4.5ghz set to per core, than sync all cores?

Any opinions on what could cause this?


Specs

Corsair 750D
I7 4770K
GTX 780
Corsair CM 750W
Samsung SSD PRO 250gb
Western 1TB hard-drive
Corsair H100i

 

[Suztera]

If you use per clock but set all the clocks to 45 then it is the same as syncing all cores.