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Can my FSP PSU handle R9 280x?

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January 27, 2014 4:06:34 AM

Guys i need help...i ordered a XFX R9 280x but i didn't think about my PSU (will it be able to handle a 280x)
I read on the forum that you need a bare minimum of 600+(that's good cuz my PSU is 650) but then i saw that you need a min of 30A on a single +12 :S......spec on my PSU are +12 v1 (18A),v2(18A),v3(18A) and v4(18A)
I have 2 6pin and 2 8pin connectors*and its 80+gold o.O whatever that means :) 
Also my other parts are FX 8350,2x500gb HDD and 1 120gb ssd,990x evo motherboard.I like it Cool but also quiet so i bought noctua case fans+NH-D14 cooler :) 
Sorry for my English...hope you can help me :) 

More about : fsp psu handle 280x

a c 101 ) Power supply
January 27, 2014 4:14:49 AM

To power this system you need at least 44A on the combined +12V rails.
You have four +12V rails each rated at up to 18A, but there will be a combined limit for these rails that you have not specified.
If you can find this combined +12V rating or list the power supply model, we can tell you for sure if this is enough.

80 plus gold is an efficiency rating. By itself this isn't a measure of quality, but it is difficult to get this rating and is a sign of a good quality power supply.
Any good quality 650W power supply would be adequate for your system.
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a b ) Power supply
January 27, 2014 4:20:34 AM

Let's go for a bit of math based on this review:

http://www.tomshardware.com/reviews/radeon-r9-280x-r9-2...

Your card should about 250W at most, which is quite a lot by the way.

PCI-E slot will supply 75W, leaving a good 175W up to your 12V rails. Now that would be (175/12 = 14,58A at 100% efficiency). Realistically, consider 80% efficiency, reaching just over 18A.

Your card has an 8-pin (150W) power connector and another 6-pin (75W) one. As long as you use two different rails, you should be fine.

EDIT: ^^ Very true, mind the total current limit.
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a c 101 ) Power supply
January 27, 2014 4:39:29 AM

Murissokah said:
Let's go for a bit of math based on this review:

http://www.tomshardware.com/reviews/radeon-r9-280x-r9-2...

Your card should about 250W at most, which is quite a lot by the way.

PCI-E slot will supply 75W, leaving a good 175W up to your 12V rails. Now that would be (175/12 = 14,58A at 100% efficiency). Realistically, consider 80% efficiency, reaching just over 18A.

Your card has an 8-pin (150W) power connector and another 6-pin (75W) one. As long as you use two different rails, you should be fine.

EDIT: ^^ Very true, mind the total current limit.


You wrote "PCI-E slot will supply 75W, leaving a good 175W up to your 12V rails".
The 75W provided by the PCI-E slot still comes from the +12V rails of the power supply.
The +12V supply to the motherboard comes via the 24-pin ATX connector and additional +12V power connector (4-pin or 8-pin) and this then supplies the PCI-E slot.
The PCI-E power connectors come from the same supply.

Distribution between the +12V rails should be handled by the power supply manufacturer.
You can use any of the provided PCI-E power connectors at the same time.

Also, the rated power is on the output, not the input so efficiency does not play a part in calculating required power rating.
The efficiency effects the power drawn on the input to provide the same output current.
We limit draw on the output to 80% or lower because efficiency is lower above 80% utilization and because components last longer if not loaded to their maximum.
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January 27, 2014 4:45:23 AM

Took me a while but i found it.....
(+12v1.....+12v4=600w max)
and under that was smt +3/+5=500w (couldn't see clearly :S)
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a c 101 ) Power supply
January 27, 2014 4:52:38 AM

D3US92 said:
Took me a while but i found it.....
(+12v1.....+12v4=600w max)
and under that was smt +3/+5=500w (couldn't see clearly :S)


You need a minimum of 520W available on the combined +12V rails (total power draw up to 415W, 520W * 80% = 416W).
600W is plenty (415W / 600W = 69% of rated power).
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January 27, 2014 4:57:41 AM

Soo im good with this PSU??
It wont do any harm to my GPU?
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a c 101 ) Power supply
January 27, 2014 5:17:42 AM

D3US92 said:
Soo im good with this PSU??
It wont do any harm to my GPU?


Yes, this power supply is perfect for your build.
No, it won't harm your GPU.
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