What PSU should I get for my system.

base59 · Mar 20, 2014

Hey I haven't built a system for a while, almost 8 years in fact. I was wondering what rating my PSU should have for my system. I got the parts picked out but am just fumbling around with the PSU. The system I'm planning on building is as follows:
AMD FX 6300
ASROCK Fatality 990FX
8 GB of RAM
AMDs new R9 280 not the 280X
240GB Mushkin SSD
1 TB HDD
A DVD drive
I got about 7 fans in the system too. I plan on eventually overclocking once I get back into it and also expanding to 16 GB of ram and adding a second grapics card once I get the money.

emdea22 · Mar 20, 2014

A seasonic s12II520 will be more than enough. If you plan to upgrade later then go for S12II620. Best value for money imo

woltej1 · Mar 20, 2014

If you want to SLI then you need a quality 700W minimum, prefereably more since you're OCin. Look into seasonic, corsair, antec or xfx for a psu in your price range.

Also, a 6300 would hold back a 280 sli set up.

Turb0Yoda · Mar 20, 2014

so about 800 watts??? I was going to a 500, but then you said you will add another GPU, and overclock, so go with 800 watts. Also, there is 7 fans. I did the calculations, and factoring the 2 GPU's, an overclock level of 500 Mhz(added on to the stock 3.5 Ghz), I came up with 805. I also made everything at peak load due to the stress testing and booting up...

Short story: 850 watts
http://www.newegg.com/Product/Product.aspx?Item=N82E16817580011
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171079

Bad_Kitty13 · Mar 20, 2014

your cpu is 125w
your mem/chipset tdp is no more than 84w
power draw for gpu is 200w
http://videocardz.com/amd/radeon-r200/radeon-r9-280

this 409w

this psu has 636 on 12v rail and would allow room for upgrades and overclocking. seasonic also makes xfx psu's
http://pcpartpicker.com/part/xfx-power-supply-p1650snlb9

you could also go with this one but the 650 is only 5 dollars more
http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9

for 2 gpus i would go with 850w this one has 840w on 12v rail and is gold 80 efficiency and fully modular for 110
http://pcpartpicker.com/part/xfx-power-supply-p1850bbefx

this will allow 200w for upgrades and overclocking

Mephikun · Mar 20, 2014

If you don't care if it's modular or not and don't need 80+ Gold efficiency, go for this

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($64.99 @ NCIX US)
Total: $64.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-20 17:06 EDT-0400)

If you want a modular, energy efficient PSU with more wiggle room in terms of upgrades, get this

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX ProSeries 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.99 @ NCIX US)
Total: $99.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-20 17:08 EDT-0400)

Good luck!

JackNaylorPE · Mar 20, 2014

Option 1- Guru3D does very good power consumption testing, just look at the review for ya card and ya done barring anything weird like 12HDs or 4 water cooling pumps. The did the x's but the 280x Im sure doesn't vary widely from the 280

http://www.guru3d.com/articles_pages/radeon_r7_260x_r9_270x_280x_review_benchmarks,10.html

Here is Guru3D's power supply recommendation:

AMD R7 260X - On your average system the card requires you to have a 450 Watt power supply unit.
AMD R7 260X Crossfire - On your average system the cards require you to have a 650 Watt power supply unit as minimum.

AMD R9 270X - On your average system the card requires you to have a 500 Watt power supply unit.
AMD R9 270X Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.

AMD R9 280X - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 280X Crossfire - On your average system the cards require you to have a 750 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.

Option 2 - use a reputable PSU calculator
http://extreme.outervision.com/psucalculatorlite.jsp

For older AMD cards, they had a systems requirements page but for whatever reason, it seems to have been moved to a harder to find place or it doesn't exist anymore

http://www.amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#2

For whatever reason, his lists the required connectors but not "the juice" required.
http://www.amd.com/us/products/desktop/graphics/R9/Pages/amd-radeon-hd-r9-series.aspx#5

For serious overclocking....the Seasonic X series and Corsair HX series (except for the 1000 and 1050) are top end ....,moderate OC's look at the Corsair TX V2, XFX Core Edition, Antec HCG / HCP.

emdea22 · Mar 20, 2014

I missed the xfire part, my bad, so 2x250w for gpus, 150 for cpu and 50 for the rest of the system. Thats 700w, however you will never draw that much power so a 650w should be enough. Whatever brand you choose to get, make sure its been properly tested. For example some corsair and ocz psus are not that great but they do have models that are very good.

Turb0Yoda · Mar 20, 2014

emdea22 :

50 watts for the fans. Also, the psu uses a lot of b=power when booting up. If you don't have enough, then it won't boot.

JackNaylorPE · Mar 20, 2014

emdea22 :

No way ever will 7 fans pull 50 watts.....

I have fifteen 140mm fans in my build.....at full speed, all 15 fans draw a total of 2.1 amps. MoBo headers, where ya connect the fans are rated at 1 amp except on a few extreme $400 MoBos.

Use the PSU calculator I linked to above to figure ya individual wattages.

RAM is 2-5 watts
Fans 0.15 - 0.33 typical (1200 - 1800 rpm)
MoBo - 40 watts
HDs / Opticals = < 10 watts

Turb0Yoda · Mar 20, 2014

I did the calculations again, and I got 817. I put everything at full load however. The Minimum comes up as 767. For reference, I use the PSU calculator mentioned above. I also factored in the overclocking, the extra GPU, and the 2 new RAM sticks.

Bad_Kitty13 · Mar 20, 2014

online psu calculators are flawed try these and do some research on the actual power draw of the components on 12v rail like cpu/mem/mobo/gpu
http://www.buildcomputers.net/power-consumption-of-pc-components.html
http://www.tomshardware.com/reviews/geforce-radeon-power,2122-7.html

they are good for getting you in the ball park but if you want exact measurements you should do the calculations yourself, also you need to verify the 12v rail on suggested psu a 650w psu could have 500w or 640w on its 12v rail. it depends on the brand and quality and then you can add up the components that run on 12v rail to get a more accurate calculation

emdea22 · Mar 20, 2014

JackNaylorPE :

emdea22 :

No way ever will 7 fans pull 50 watts.....

I have fifteen 140mm fans in my build.....at full speed, all 15 fans draw a total of 2.1 amps. MoBo headers, where ya connect the fans are rated at 1 amp except on a few extreme $400 MoBos.

Use the PSU calculator I linked to above to figure ya individual wattages.

RAM is 2-5 watts
Fans 0.15 - 0.33 typical (1200 - 1800 rpm)
MoBo - 40 watts
HDs / Opticals = < 10 watts

i said rest of system as in Mobo ram and hd, NOT FANS

Turb0Yoda · Mar 20, 2014

emdea22 :

JackNaylorPE :

i said rest of system as in Mobo ram and hd, NOT FANS

Was talking about me.

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