I can really find an answer and all I know is from my reading so dont trust it but although the GPU has its own VRM its not exclusive to itself and the power needed by the GPU goes through the motherboard VRM or has some relation.
This comes to mind after upgrading my GPU from a GTX 550 to 760...
Afternoon,
My CPU is throttling to between 7 and 21 multiplier on stock speeds and I'm not entirely sure why. (CPU: AMD FX-8150 Mobo: M5A78L-M/USB3)
Firstly I disabled 'Quiet n' Cool' and turned off 'Turbo Core' AMD Overdrive disabled it again (To ensure that APM was disabled)
Secondly...