[SOLVED] Enough wattage for VEGA 64?

KingMK · Nov 14, 2018

Hi, im having a dillemma...

My system:
-i7 4790 3,6ghz (stock) with Cooler master ML240L RGB
-Asrock Z87 Pro4 mobo
-2x 8GB DDR3
-2x WD 2TB Blue
-1x SSD 256GB
....and the part im concerned about is PSU EVGA G2 550W Gold

Im planning to buy a new graphics card, AMD Vega 64 Nitro+ from Sapphire, which im gonna undervolt too.

Is this PSU gonna be enough to run this setup? What do you guys think?

Thank you for your answers and help!

BringerOfTea · Nov 14, 2018

From what I could find req power is 850watts and 3 x 8 pin PCI Express power connector...

so you are a bit short.. that card seems like a powerhungry devil

guanyu210379 · Nov 14, 2018

Vega 64 air or water?
Air should suck about max 300-350W
The water version should suck about 100W more.

I would say, if you are getting the air cooled version 650W is the minimum.

I hate to bash AMD but I would rather get 1070ti or 1080 or 2070, they are more power efficient.

Zerk2012 · Nov 14, 2018

The video card is 240 watts the processor is 84 watts more like 95 in turbo mode, about 80 watts for the rest so about a 415 watt PC under full load. About 75% under a unrealistic full load it should be fine.

guanyu210379 · Nov 14, 2018

That 4790 system combined with a Vega 64 air will suck around 560W under full load, which can and will happen during gaming.
Having 550W can be a problem depending on how good/bad your PSU is. I would not recommend it but you can try.
If you plan to go for 400-450W PSU, go ahead!!

KingMK · Nov 14, 2018

As i said, the GPU will be AMD Vega 64 Nitro+ from Sapphire (air cooled). I also found this https://www.tweaktown.com/news/62131/sapphire-tweaks-rx-vega-64-nitro-drops-2-8-pin-pcie/index.html

I prefer AMD because i own freesync monitor

Hmmm... Some people say its a bad idea, some that it should work fine...

guanyu210379 · Nov 14, 2018

Price/card-performance on Vega 64 = OK
It comes however along with the extra on your monthly electrical bill compared to the alternatives, this is where people start to say no.

BringerOfTea · Nov 14, 2018

KingMK :

http://sapphirenitro.sapphiretech.com/en/Vega64LE.html#specifications

They haven't updated the requirements to 2 x 8-pin PCIe and they still "recommend 850" watts.

So you will be borderlining it even with undervolting.

Zerk2012 · Nov 14, 2018

guanyu210379 :

100% false information how do you get 560 watts out of a 240 watt card and 84 watt processor.

Zerk2012 · Nov 14, 2018

BringerOfTea :

What they recomend means absolutely nothing. 240 watt video card that is all they should say.

guanyu210379 · Nov 15, 2018

Zerk2012 :

To double check use:
https://outervision.com/power-supply-calculator
Enter your usage patern correctly.
I did only by using my stomach. You will see not a big difference to my stomach calculation.

Even AMD already mentioned 750W as recommended for Vega64.
https://www.amd.com/de/products/graphics/radeon-rx-vega-64

I already said, go ahead with 450W PSU! Let see how long your system will survive.

cookiemania66 · Nov 15, 2018

I just drop that here

https://www.tomshardware.com/reviews/amd-radeon-rx-vega-64,5173-17.html

Peak power consumption (=PPC because im lazy) can be 350 Watt for the Aircooled AND AMD STOCK VERSION! Since Aftermarket Cooler are way better i expect the PPC to be atleast 50 Watt higher.

The EVGA PSU does have a single 12V Rail with a rated max current of 45,8A = ~ 550Watt for CPU and GPU.

Yea if you dont overclock or maybe even underclock the card you are fine but i also dont see a reason why i would spend 400-500€ on a GPU just to cheap out on the PSU.

I rather buy a 300-400€ GPU and spend a shitload of money on a Seasonic PSU for example.

And by the Way: the 84Watt for the CPU you meantioned is just the TDP - The maximum Amount of heat you have to get rid of. The TDP is NOT the Amount of Power the CPU does pull. Not a 100% of the power consumption does get turned into heat. Its like a light bulb = 10% is light and 90% is just heat so the actual power consumption can be higher then the TDP under full load.

guanyu210379 · Nov 15, 2018

@cookiemania66:
Everything were already mentioned actually.
Yes, I already wrote 300-350W max.
Yes, if the 550W PSU is good. It should be just enough. I would take stronger PSU tho'.
There is only that one guy insisting with 450W PSU recommendation.
I said already, if someone wants to use 450W, go ahead.

cookiemania66 · Nov 15, 2018

guanyu210379 :

It was directed to that one guy but i forgot to link him

The main reason for my reply was the fact that some people think that TDP equals Power Consumption (84 Watt CPU and that Stuff) in a 1:1 Ratio and that it is just straight up false in my opinion.

I totaly agree with everything you already said^^

BringerOfTea · Nov 15, 2018

if he manages to find one that doesnt require 3x 8pin(6+2) pce power, which I doubt. the psu hes got only has PCIe 2x 8pin (6+2), 1x 6pin... making him shor to two pins.

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[SOLVED] Enough wattage for VEGA 64?

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