I've seen some GPU pcb breakdowns and there is usually a common layout that has VDDCI, VCORE, VMEM, VDISP now what I'm specifically wondering is to which of those is the gpu fan power connected to?. I know I'm talking about small percentages but I'm trying to determine if it would be marginally better to plug the gpu fans to the motherboard instead of the gpu for overclocking purposes, I'm using a kraken g12 so basically the two AIO fans can pull like 1 amp from a standard fan header at 12v that would be 12watts max per fan and that's quite significant for a 185watt card. I'm trying to not influence the power available for vcore and vmem by connecting an AIO pump and two 140mm fans with a spliter using this cable that I bought
From what I've read the card is kinda power limited since it has a single 8 pin connector while other higher clocking models have either 8 and 6 pin or two 8 pin connectors.
The GPUs are designed to power it's own fans. Even if your GPU has an additional fan headers, they are only for PWM fan support. AIO pumps should always be plugged to the motherboard and as specified in the AIO and motherboard specs. Just make sure that you have enough PSU power capacity and all your motherboard power pin cables are supplied with.