How bigh psu will be needed for crossfire?

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vampyiere6

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Mar 7, 2013
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So im gonna switch to an intel mobo, i5-4670k haswell.

Atm i have and gigabyte 7970 oc edition and i plan on getting a second one later or an R7-280x, So how much power would that need in crossfire, do the normal oc 7970 or the R7-280x draw less power? i will go with gigabyte if i go second gpu, so what gigabyte card draw less power?

Atm i have a thermaltake smart 730w, but remember i will go intel haswell so it will draw less power then my current amd cpu.

i have keyboard,mouse,headset, controller, some external harddrives some with own power supply and some that is direct from usb, so all those draw a little power.

And i have 5 led fans, 2 normal ones, will add 1 fan more later.

Here is the rest of my spec, so will the 730W be enough with haswell mobo and cpu then?


thermaltake SMART 730W
http://www.thermaltake.com/products-model.aspx?id=C_000...

SPecs:

cpu: amd fx-4100 OC 4,2 Ghz
mobo: asus m5a99x evo
ram: kingston 16gb 1333 mhz 4x4 gb sticks
gpu: Gigabyte radeon HD 7970 oc 1000 mhz
storage: 120 gb ssd 60x2 ocz and 1tb normal hdd
cooler: antec kuhler 620
case: fractal design core 3000
psu: 730w thermaltake SP-730AH2NH
optical drive: LG bluray station
fan controller: Lamptron Fan Controller FC5 V2
 
Solution
JOHNN93
7970 has 300 watt power consmption r9 280x has a 250 watt power consumption youl need 550 watt's there.
and put another 300 watt for the rest of the components you need more than 730 watts.
a realy good 850 watt minimum should be eficient.
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JOHNN93

JOHNN93

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7970 has 300 watt power consmption r9 280x has a 250 watt power consumption youl need 550 watt's there.
and put another 300 watt for the rest of the components you need more than 730 watts.
a realy good 850 watt minimum should be eficient.
 
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vampyiere6

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OK thanks.

 
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vampyiere6

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OK thanks.

But aslong i dont stress it like add a other gpu i should be fine and have no worries? so far i had no problems at all with it. Will this psu work with a haswell mobo? that needs the extra 12v or w/e im not 100% sure what it needs from the psu. only read a little that haswell have like a "sleep mode"
 
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cuecuemore

cuecuemore

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Aug 2, 2010
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Yeah, for a single 7970/R9-280x that unit should be fine, I'm just concerned about it not being able to go to its advertised limits.

EDIT: It appears that your current PSU is not Haswell ready :( I hear that you can deactivate the new sleep states, but I don't know if that's the whole problem and I'm not even sure if that works, so I'm not really the person to ask on that front.
 
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Roger Rogers-1382392

Roger Rogers-1382392

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On my backup gaming rig (in another room) I use a 700W Platinum PSU for a Haswell i5 W8.1 Asus Crossfire R9 280, and it runs great.
Better than 89% of all results according to 3DMark Firestrike at 1080p.

It also has 4 other hard drives in there.

I was even thinking of going SLi with this one... already at 850W.
 
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