![]() If it doesn't have the necessary connectors to power up your system, time to shop for a single new supply that will. If they are plugged into to two different wall outlets, do you have them physically strapped to ensure a common ground? Are all 6 of the essential output voltages (+12, +5 and +3.3VDC on both supplies) within tight tolerances of the allowed ±5% deviations? I note "IF", for example, the +12VDC on the 850W is running at +12.5V and the +12VDC on the 750W is running at +11.5V, both are technically within allowed limits but that 1V difference is still an 8% difference, which may cause problems with some boards. I suspect you are causing your own problems here by trying to use two supplies at once. Although a modern CPU does not require so much power, a dual CPU connector can help deliver power in a more stable manner. It is important to understand while we must size our PSUs with the capability to support all the connected components demanding maximum power at the same point in time, it is extremely rare for the CPU, GPU, system RAM, graphics RAM, drives, fans, motherboard, and any other connected device to all be maxed out at the same instant.īut even if that remote possibility occurred, that quality 850W supply can handle, assuming it is working properly. A dual CPU connector on your motherboard can push up to 672 watts of power. 850W - especially with that high quality Seasonic - is considerably more than enough even in the most demanding scenarios. It seems a single PSU with the primary 24-pin and auxiliary ATX power connectors disconnected, but the graphics card cable(s) connected "should" simulate the same scenario.Ĭlick to expand.100% agree. I might have to get out my trusty DVM and play around with a test setup to see this for myself. In some power supplies, you might find more than one CPU cable. This allows it to be connected to both 4-pin and 8-pin connectorsjust put one of them aside if you dont need to use it. Granted, the fans would (should) not be drawing anything close to 75w, but still, to me, there should be no backwards flow at all. Almost always, your PCs power supply will include an 8-pin connector that breaks in two, known as a 4+4-pin. I note PCIe slots are rated to deliver 75w max and that is why many graphics cards require supplemental power directly from PSUs via additional cables. But in a PC, I would think there should be some sort of diode device(s) in the card and/or motherboard to prevent current flowing backwards through the slot. Battery circuits for example, flow one way when the battery is supplying voltage, and flow the opposite way when charging the battery. Many DC circuits are designed for current flow either way. To be sure, unplug the AC power cable from the wall to the other (primary) power supply and see if the fans still spin. What "fans in the system"? CPU cooler fans? Other fans?Īre you suggesting voltage applied directly to the graphics card only is causing current to flow through the card and into the PCIe slot that then powers your CPU fan(s)? As in the current is flowing backwards through the slot?
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