Advice on PSU for OC'd system

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Jonathan Cave

Jonathan Cave

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Oct 17, 2013
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Will an EVGA G2 650w be enough for my overclocked 4770k @ 4.3Ghz & OC'd 1080 Ti?

I hear the G2 is more or less silent, whereas my XFX 850W XXX black edition is rather noisy under gaming load.
 
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Rogue Leader


The G2 and P2 have hybrid fan modes, I am not sure about the RM650x, hybrid fan keeps the fan off except under heavy loads. All 3 are quiet you really can't go wrong with any of them.
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terry4536

terry4536

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Mar 28, 2010
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It should be OK. The only component to be concerned about is the graphics card. The GTX 1080 Ti has a system requirement of 600 watts.

I would expect both power supplies to be quiet. But , I can recommend the Seasonic Platinum power supplies for being very quiet. I have one (860 Watt).

https://www.nvidia.com/en-us/geforce/products/10series/geforce-gtx-1080-ti/
 
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Rogue Leader

Rogue Leader

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Dec 22, 2014
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650w is more than enough and thats an excellent PSU. You could run a 550 G2 and be fine.
 
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velocityg4

velocityg4

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Nov 21, 2006
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If you are so bold. You could always replace the PSU fan in your current PSU. Perhaps with a quiet Noctua NF fan. Be sure to take proper precautions as some of those capacitors can be storing a high voltage charge.


This system draws 410w with an i7-6700K at 4.6Ghz and a GTX 1080 Ti OC.
http://www.eurogamer.net/articles/digitalfoundry-2017-nvidia-geforce-gtx-1080-ti-review


The 1080 Ti draws about 280w default. A regular OC might add another 30W.
http://www.tomshardware.com/reviews/nvidia-geforce-gtx-1080-ti,4972-6.html

4.3Ghz is a fairly mild overclock. I'd expect the CPU, Motherboard, RAM and hard drives to draw at most 150W. At standard clock rates the i7-4770K draws about 115w at load including motherboard, RAM and hard drive. At 4.6/4.7Ghz the same would draw about 35W higher.


Load power draw integrated graphics: http://www.anandtech.com/show/7003/the-haswell-review-intel-core-i74770k-i54560k-tested/2
Power Difference between 3.5Ghz and 4.7Ghz: https://www.bit-tech.net/hardware/2013/06/01/intel-core-i7-4770k-cpu-review/7

I'd expect a system draw in the 425W to 450W range under load with overclocking.
 
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Rogue Leader

Rogue Leader

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Dec 22, 2014
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The G2 and P2 have hybrid fan modes, I am not sure about the RM650x, hybrid fan keeps the fan off except under heavy loads. All 3 are quiet you really can't go wrong with any of them.
 
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