will my psu handle 2 sapphire r9 280x toxic gpus

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Kyber Darkskies

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Jul 25, 2013
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My current specs:
Mobo: GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX
CPU: AMD FX-8150 (OC ro 3.9)
RAM: 1333 ddr3
Hard drive: Samsung 120GB SSD + seagate 1TB HDD

Honestly this seems to be more of a power supply question, but I didn't see a forum on them specifically. So I went to the next best thing seeing as it is also about my graphics card. So basically I would like to know if people here whom know more about actual power draw of a computer could tell me if my power supply.

RAIDMAX RX-850AE 850W

could handle two of my graphics cards in crossfire

SAPPHIRE R9 280X 3GB TOXIC

i appreciate everything in advance, and apologize if this does turn out to be in the wrong area.
 
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Eduello

Eduello

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Mar 2, 2014
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Yes, it could probably handle it (for a while at least). Would I recommend it? No. Raidmax PSUs are really, really poor quality and shouldn't be put under heavy loads.

http://www.tomshardware.co.uk/answers/id-1804779/power-supply-unit-tier-list.html
Tier five - Replace immediately. These units are NOT recommended for any system, no matter the purpose. Reference to higher tiered models for a better and potentially money-saving unit


A-TOP technology
Apevia
Apex (SUPERCASE/ALLIED)
Artic / Ace (They're the same company)
Aspire (Turbocase)
ATADC
Athena Power
ATRIX
Broadway Com Corp
CIT

Cooler Master
eXtreme series
Elite series

Coolmax
Deer
Diablotek
Dynapower
Dynex
Eagletech
Enlight
Evo labs
EZ-cool
Foxconn
FSP Everest
G7
HEC / Compucase Orion
Hiper Type-R (less than 600 Watt)
Huntkey (Apart from jumper series)
iStar computer co.
In win (Despite some reputable reviews, they are known to fail quickly)
Jeantec
JPac
Just PC
Kingwin (their budget models)
Linkworld electronics
Logisys computer
Macron
MGE
MSi (just stick to their GPUs and motherboards)
NMEDIAPC
Norwood Micro/ CompUSA
NorthQ
Okia
Powercool
Powmax
Pulsepower
Q-tec
Raidmax
Rocketfish
Rosewill (their older PSUs)
SFC
Sharkoon
Shuttle
Skyhawk
Spire micro
Startech
Storm
Sumvision
Tesla

Thermaltake -
Munich 430w
Purepower NP / RU
TR2 and TR2-RX

Trust (Stick to their peripherals)

Ultra -
X-connect series
X2 (Greater than 700 Watts)
LSP series

Wintech
Winpower
Xion
Youngbear
Zebronics
 
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Alex Whitfield

Alex Whitfield

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May 6, 2013
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You will need more power that psu will run it but it will throttle when the cards try to whirl up to full power.
That cpu being overclocked probably has about 150 watts ate up already and with two storage devices not one your head room is a little low for two high power draw cards at once.
They recommend 1000 watts for two of these (although usually recommendations are over done) but in your case it fits you have a already pretty power hungry pc before these cards are added.
So again it WILL run but it will lag if you for example run 2 monitors at once.
Because when those cards whirl up to full power draw the watts won't be available to go around and they will throttle to avoid damages.
So if your fine with 2 performing like one then do it if not than I highly recommend steping up to a better psu.
Under load these two cards together will consume 600 - 650 watts and your cpu somewhere around 150 (guessing since you overclocked may be worst) that means best case scenario there is 100 watts left for everything else.
Problem is your mobo will eat most of that and you start seeing the issue from there.
Your system with these cards when under load will need AT LEAST 900 watts so if you run with that psu your system will either throttle or worst get damaged.
You need atleast a 1000 watt psu buddy.
Head room is important to pc's
 
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toyftw

toyftw

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Jul 29, 2012
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If it were a decent quality 850w (750 for that matter) would be more than enough. The issue is:

RAIDMAX are terrible, junk PSU's. You are risking your system with it.
 
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toyftw

toyftw

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Jul 29, 2012
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No they wouldn't - max tdp is 250w each, which is rarely achieved.
A good quality 750w unit will CF a sys with 2 280x's.
 
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Alex Whitfield

Alex Whitfield

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May 6, 2013
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@toyftw
Tdp doesn't translate to actual maximum power draw.
Look into it just one of these card can get upwards of 340 watts alone stock settings underload.
That is an extreme.
I myself see them average idle about 90 watts average load about 300 watts but they do and can flare up.
These power draws can get even worst if you overclock or mess with fan settings etc which most enthusiasts will do.
Two of these at full load can practically run a 750 psu into the ground by themselves.
Tdp is an estimate and estimations are based on controlled settings different from real life they are usually off by at least a little.
Anandtech found a 339 watt average for load power draw far off their tdp.
 
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toyftw

toyftw

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Jul 29, 2012
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Where did you find 340w power cons?

The highest # I've seen for a 280x was 257w in bitcoin mining, 241w other than mining.

A good 750 will CF 280x's for gaming.

 
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Alex Whitfield

Alex Whitfield

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May 6, 2013
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Like I said underload and during flare ups.
Most the time things will run smooth but say run 4k gaming or multiple monitors or just a really demanding game while doing other things at once these cards will draw massive chunks on power.
Plus flare ups can hurt.
His oc cpu and these two cards won't always need it but when they do a 750 or even a 850 can't supply the goods and they will throttle aka lag spikes and possible damage even (unless good psu like corsair).
I get these averages with no overclocking I only mess with fan to whirl up more to stay cooler I don't like 80+ Celsius.
Even than I flare up high sometimes. If he wants two hooked in his job for them must be demanding.
Plus remember anandtech and others have seen these cards flare up very high on stock settings.
Their power hungry.
But even if your right your wrong.
Combined tdp is 500 + 150 for that oc cpu leaves only 100 watts for rest of system and flare ups and load draw.
Aka
Throttle
His 850 would struggle as it may only provide what is needed if that under load and wouldn't have head room.
That isn't healthy on a system and would wear it down quicker till it starts throttling as well.
Either way he throttles he needs more power for such hungry parts.
 
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