How much PSU power should i get ?

Bahij Mikati · Sep 8, 2014

Hi everyone, My new rig specs :
-Haswell 4.0GHz - i7-4790K 8M/LGA1150
-Kingston HyperX Beast 16GB Kit (2x8 GB) 2400MHz DDR3 PC3-19200
-MSI Z87-G43 GAMING
-Cooler Master CM 690 II Advanced RC-692A-KWN5 Mid Tower ATX USB3.0 Version
-3TB WD30EZRX ~7200RPM SATAIII 64MB + Kingston HyperX 3K SH103S3/120G 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD)
-Sapphire 11226-00-40G TRI-X R9 290X 4GB GDDR5 OC
-LG Wide 23.8" LED IPS Full HD
My question is this PSU gonna make it out alive with my set-up ? http://www.corsair.com/en-us/rm-series-rm650-80-plus-gold-certified-power-supply
Also do you recommend me to buy a CPU cooler ?
And please tell me your opinion of my rig thanks a lot .

spooky2th · Sep 8, 2014

A 750W PSU is required for that 290X. I would get at least an 850W PSU just for peace of mind.

Dark Lord of Tech · Sep 8, 2014

A 290X can run off of a decent 600w , but here's a great deal on A 750w B2 made by Super Flower.

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($69.99 @ Newegg)
Total: $69.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-08 14:58 EDT-0400

jimthenagual · Sep 8, 2014

I think your current PSU will work just fine

That CPU's TDP is 88 W
That GPU's TDP is 290 W
That's 378W
Add 100 for the rest of the system, that makes 478W. Then I like to add on 100-150 for the headroom, that's 578-628W.

That GPU requires 1x 6-pin + 1x 8-pin and wants 33A on the +12v rail.
The RM650 has the connectors, and provides 54A on the +12v rail.

I see no reason to not trust it. It's also a high quality PSU.
It's a tier 2 class A psu on this list
http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html

spooky2th · Sep 8, 2014

Look under system requirements here:

http://www.sapphiretech.com/presentation/product/product_index.aspx?pid=2090&lid=1

That 290X is not an ordinary 290. Sapphire says, a 750W PSU is required. To be on the safe side I would take note of what the manufacturer says. Get a 750W PSU like SR-71 Blackbird mentioned or I would suggest a good 850W PSU just for some peace of mind.

jimthenagual · Sep 8, 2014

spooky2th :

Here is the exact GPU, with a TDP of 290W.
http://www.techpowerup.com/gpudb/b2707/sapphire-tri-x-r9-290x-oc.html

Websites have to overstate the required wattage to cover their arses.

Bahij Mikati · Sep 8, 2014

Ok to be on the safe side i am going to buy http://www.corsair.com/en-us/rm-series-rm850-80-plus-gold-certified-power-supply
My other question guys what do you recommend for me as a CPU cooler ?

jimthenagual · Sep 8, 2014

Actually, that model of RM is inferior to the one you currently have as far as the parts used in its construction. The maker of the 850W is not the same maker as the 650W. It's made with some inferior capacitors that can lead to system instability.

The one SR-71 linked above would be a far better choice.

spooky2th · Sep 8, 2014

The amps are the real question. Not all PSUs can handle the same amount of amps even if rated the same wattage. I would not be surprised if that 290W GPU took a lot of amps. AMD GPUs are power guzzlers.

I still would get at least a decent 850W PSU.

jimthenagual · Sep 8, 2014

spooky2th :

That RM650 puts out 54Amps on the +12v. Typically a system with an R9 290x uses about 33A. Even if that model uses a little more, the 54A on the RM650W is plenty for that system.

I'm not trying to be aggressive here or anything. It's just that our systems (assuming they are high quality PSUs) need far less than the typically suggested wattage.

Here is a real world example with Tony from OC3D TV with an Intel 4670k with an Nvidia 780 Ti running perfectly fine on a decent quality 450 watt power supply. I would never recommend a 450W for that kind of system of course, but this video/article is a real world test, measuring the watts drawn from the wall with the system described above.
https://www.youtube.com/watch?v=ajiN9aVOv4A&list=UU_SN80_V2GymyCWM2oTYTeg

Bahij Mikati · Sep 8, 2014

Is this a better choice ? http://www.thermaltake.com/products-model.aspx?id=c_00001716

Bahij Mikati · Sep 8, 2014

Thanks a lot guys for your time . Do you recommend any cooling system or i would do fine without any ?

jimthenagual · Sep 8, 2014

I can't find any reliable reviews on that exact model of the toughpower grand lineup. I found one for the 750W, but that is a different OEM from the 850W. What website are you shopping from and what is your budget? One of us can find a good deal for you I'm sure.

spooky2th · Sep 8, 2014

That Thermaltake PSU would be a great choice.

If you are not going to OC the CPU any, you can probably get by with the stock CPU cooler. Otherwise an EVO 212 would be a nice pick.

I might get a another fan or 2 if your case has the options for them. To remove the excess heat that the 290X will be creating.

Dark Lord of Tech · Sep 8, 2014

There are 2 models of the 850 grand , one made by Sirtec and one made by CWT.

They are just average power supplies.

Bahij Mikati · Sep 8, 2014

Thanks bro , and no i am not into OC my system , thanks again guys !

spooky2th · Sep 8, 2014

You can find lot's of PSU reviews here:
www.jonnyguru.com

How much PSU power should i get ?

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