Is A 650W Power Supply Enough For This Build?

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ZaidRadeon

ZaidRadeon

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Hi everyone. I had a quick question. I've begun to build a custom PC and I'd like to know if an EVGA 650 GS would be sufficient for the following specs:

Processor: Intel Core i5 6600k (will overclock to around 4.4ghz)
Graphics Card: Asus Strix R9 390 (300W peak)
CPU Cooling; Corsair H100i GTX
Motherboard: MSI Z170A Gaming M5
RAM: Ripjaws V 2x4GB DDR4 Modules @ 2133mhz
Storages: 1 SSD & 1 7200RPM HDD
Case Fans: 3 120mm fans

If the power supply's wattage isn't sufficient, other recomendations are appreciated. My case basement only supports a 120mm PSU fan so please keep that in mind. Thanks in advance! I

 
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JackNaylorPE


Peak instantaneous power does not really impact required PSU sizing .... thats what caps are for (as well as filtering).

https://en.wikipedia.org/wiki/Capacitor

The Guru3D test (282 watts) was done by measuring power draw with a meter at the wall .... can't get more 'sure' than an actual power measurement. Also 282 watts "at the wall" means that at 90% effieciency, the card is putting out just 254 watts and that **is** what matters in PSU sizing.
http://www.guru3d.com/articles_pages/powercolor_radeon_r9_390_pcs_8gb_review,8.html...
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JackNaylorPE

JackNaylorPE

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http://www.guru3d.com/articles_pages/powercolor_radeon_r9_390_pcs_8gb_review,8.html

Card power - 287 watts per Guru3D / 231 average per Techpowerup ... say 250 watts
Here is Guru3D's power supply recommendation:

AMD R9 390 and 390X - On your average system the card requires you to have a 550~600 Watt power supply unit.
AMD R9 390 and 390X Crossfire - On your average system the cards require you to have a 800 Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.
Click to expand...

personally i think that recommendation is a bit weak when you consider that they used a 5960X which can pull 378 watts when overclocked (system) ... 378 system + 250 card = 628 ... so 550 seems a bit light fir a 5960x. An overclocked 6600k would be about 100 watts less so 278 + 250 = 528 means your PSU is fine . I am a bit perplexed in that OC utilities have a power limiter slider which purports to allow up to a 50% increase in power. If that were accurate + 125 watts would put you a bit too close to 650. I doubt that it is real though.... if you put a power meter at the wall socket, I don't see you pulling more than 450 - 525 watts (average) at the wall.

 
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ZaidRadeon

ZaidRadeon

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The wattage on the power supply is the only thing that concerns me. The graphics card alone uses 300W at peak in this build. Does anyone else have any additional information? Thanks in advance.
 
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JackNaylorPE

JackNaylorPE

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Peak instantaneous power does not really impact required PSU sizing .... thats what caps are for (as well as filtering).

https://en.wikipedia.org/wiki/Capacitor

The Guru3D test (282 watts) was done by measuring power draw with a meter at the wall .... can't get more 'sure' than an actual power measurement. Also 282 watts "at the wall" means that at 90% effieciency, the card is putting out just 254 watts and that **is** what matters in PSU sizing.
http://www.guru3d.com/articles_pages/powercolor_radeon_r9_390_pcs_8gb_review,8.html

techpowerup shows:
https://www.techpowerup.com/reviews/Powercolor/R9_390_PCS_Plus/28.html

Average: 231 watts - Metro: Last Light at 1920x1080, representing a typical gaming power draw. Average of all readings (12 per second) while the benchmark was rendering (no title/loading screen). In order to heat up the card, we run the benchmark once without measuring power consumption.

Peak: Metro: 253 watts - Last Light at 1920x1080, representing a typical gaming power draw. Highest single reading during the test.

Maximum: Furmark Stability Test at 1280x1024, 0xAA. - 323 watts - This results in a very high no-game power-consumption that can typically be reached only with stress-testing applications. We report the highest single reading after a short startup period. Initial bursts during startup are not included, as they are too short to be relevant.
Click to expand...

I will note that it pays to have some headroom when you are going for that last little bit of potential CPU / GPU overclocks. The closer you get to rated voltage, the higher the ripple and the lower the voltage stability. So those spikes ... while not putting you in a position of drawing too much amperage ... may give your systems VRMs a little hiccup at very high OCs.


The calculator here, also says you're fine
http://outervision.com/power-supply-calculator
 
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ZaidRadeon

ZaidRadeon

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Thank you very much Archaic59 and JackNaylorPE. The power supply does have reasonable headroom when it comes to voltage. In addition, I don't plan on overcloking the CPU or GPU much, so voltage instability shouldn't arise. It's evident that the EVGA 650W PSU is suitable for the build. I appreciate everyone's help. Have a fantastic day :)
 
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