Solved power supply requirement GPU upgrade

January 27, 2015 at 12:07:35
Specs: win 7 64 bit, AMD fx6300/8gb ddr3 1600mhz
I am on a budget as always and im upgrading my gtx 650 ti boost to a r9 280x or if im lucky to a r9 290. Now i know both of them recommend a minimum 750w power supply. I tried the cooler master power calculator which estimated power consumption at around 460w. I have a 500W power supply im pretty much at the limit. The question is what happens when you reach the limit ? And also what are the effects of using a weaker power supply than recommended ?

Thank you.

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January 27, 2015 at 12:54:01
Stick with one post HERE please


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January 27, 2015 at 20:39:33
✔ Best Answer
The cards you mentioned both require one 6-pin PCIe plug (75W) + one 8-pin PCIe plug (150W) + the wattage from the PCIe slot (75W), so that means they consume more than 225W but less than 300W. 300W requires 25A from the +12v rail. The FX-6300 (not overclocked) consumes 95W, so that's another 8A on the +12v. Figure at least 1A per drive & 0.25A per fan. Add everything up to determine the minimum amperage requirement for the +12v rail.

See the following for info on power supplies & what can happen if you exceed the capacity:

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January 28, 2015 at 08:21:01
Well i read that it's quite complicated but as i understood i am out of power. I have a raidmax RX 500 with 1 12 volt rail which can deliver 22A. Which is not enogh. But i have learned something new which is nice and now more about how to shop for a power supply. Thank you your time and patience.

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