Even if not great in magnitude it's very rapid and the effect is multiplied by the way a buck regulator (the VRM on the board) has to 's called line side regulation. But the often overlooked effect is the voltage drop between PSU and GPU due to cable resistance that can causes wild voltage fluctuations with GPU loading during a game. PSU power handling is important, of course, not discounting that. Ohms law.E=I*R.resistance to current flow results in voltage drop. Or use a diagram like the below one linked for corsair PSU cables.Ĭlick to expand.That's exactly what I'm describing. You can compare to your other cables, which is a gold standard and probably the best way. That will challenge the line-side regulation of the card's VRM's.Īs far as testing your cable: you simply need a bug light to test continuity from the PSU connector to the GPU connector. The lighter you go with wire gauge the more the cable will impose it's own voltage drop that varies under load.
If made with 16 ga wire it would work OK, if 18 ga maybe but many PSU's are made with 20 ga., some 22 ga. Cheaping out on doubled up splitters won't help a PSU designed to power one 8 pin connector cut the mustard.Īnd even if it does have the power handling a splitter leaves a single cable to carry the current load of both 8 pin connectors from the PSU to the splitter. What that means is the PSU also should be designed to handle the power draw of that beast. That means either three complete cables into the PSU or three connectors at the PSU if modular. Ideally, it should be three 8 pin connectors on 3 cables all the way back to the PSU. Click to expand.My guess is you'll need all 24 pins connected properly for the GPU to initialize.
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