Quote from: jmigdlc99 on January 08, 2021, 06:18:47 AM

So it's time to turn on my rig again but i've run out of working PSUs.

I'm looking to use a molex to 8-pin PCIE adapter like this one in the image below.
If the 3060ti only consumes around 120-150w undervolted do you guys think it's safe to use this?

Be sure to check the AWG rating of the wires used in the adapter (you can read the AWG rating printed directly on the insulator covering each yellow/black wire of the adapter). If you're pulling 150 watts then you are asking each molex (i.e. it's associated 12V line) to provide 75 watts each. This means a current draw of 6.25 amps per 12V molex line. This would require a wire rated for AWG 22 or better (in AWG terms a better rating means a lower AWG number which corresponds to a higher amperage capacity of the wire). So be sure the wires attached to the adapter have "AWG 22" printed on them.

The connector itself (ie. the plastic housing and metal flanges/probes are rated for 8 amps for the typical molex connector, so they can handle the 75 watts per molex.

See the following AWG chart for wire amperage capacities (in the column labeled "Maximum amps for chassis wiring"): https://www.powerstream.com/Wire_Size.htm

Quote from: miner29 on January 09, 2021, 12:47:25 AM

https://www.gpuminingresources.com/p/psu-cables.html

All is answered there. Respect the wattage limits or you may well burn something up or everything down.

Note that the "www.gpuminingresources.com" guide is assuming wire AWG gauges which are maxed to match the rating of the connector. For example, the 8-pin PCIe is shown to support 288 watts which, with three 12V circuits, means a draw of 8 amps per circuit hence requiring AWG 21 gauge (or better) wires.

So be sure to check that the wires used in the actual adapter are rated accordingly to the amperage you are expecting to draw through them.

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Lastly, as others have pointed out, be sure to connect the dual molex connectors to separate cables from the PSU. If you connect both molex connectors to a single "daisy-chained" cable from the PSU then you are asking the single 12V pin on that cable to provide the entire 150W you're drawing, which means around 12.5 amps current draw on that single pin, hence requiring a PSU cable wire rated at AWG 19.