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750w psu for 7970 + r9 280x crossfire?

Last response: in Components
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February 26, 2014 2:37:52 PM

My system right now with a i7 960 3.2 and amd 7970
I have an cooler master gx 750w psu I'm thinking of going crossfire with r9 280x
Would my gx 750w psu cut it do you think?

a b U Graphics card
February 26, 2014 2:39:23 PM

Those won't crossfire.....
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a b À AMD
a c 540 U Graphics card
a c 1167 ) Power supply
February 26, 2014 3:20:55 PM

What is the brand and model of the Radeon HD 7970 card? What clock speed is the GPU and memory being run at?

If the clock speeds of the Radeon R9 280X and Radeon HD 7970 are running above what the AMD Reference Design Radeon HD 7970 runs at then I would say that the Cooler Master GX 750W will be insufficient.

I don't know if your specific version of the Cooler Master GX 750W has only two (6+2)-pin PCI Express supplementary power connectors or four.
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a b À AMD
a c 540 U Graphics card
a c 1167 ) Power supply
February 26, 2014 3:24:04 PM

tcb1005 said:
ko888 said:
tcb1005 said:
Those won't crossfire.....


So you're saying this is a lie:

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

and

http://www.hardwarecanucks.com/forum/hardware-canucks-r...


According to outer vision extreme,
Minimum PSU Wattage: 718 W
Recommended 768 watt.
So are you suggesting that only a bronze certified PSU would be enough?


What are you going on about?

You specifically said "Those won't crossfire.....".

I provided links to evidence that shows that your statement is completely false.
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a b U Graphics card
February 26, 2014 3:27:00 PM

ko888 said:
tcb1005 said:
ko888 said:
tcb1005 said:
Those won't crossfire.....


So you're saying this is a lie:

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

and

http://www.hardwarecanucks.com/forum/hardware-canucks-r...


According to outer vision extreme,
Minimum PSU Wattage: 718 W
Recommended 768 watt.
So are you suggesting that only a bronze certified PSU would be enough?


What are you going on about?

You specifically said "Those won't crossfire.....".

I provided links to evidence that shows that your statement is completely false.


I meant that they wouldn't crossfire with that PSU.
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a b À AMD
a c 540 U Graphics card
a c 1167 ) Power supply
February 26, 2014 3:30:02 PM

tcb1005 said:
I meant that they wouldn't crossfire with that PSU.


How is the OP suppose to know what you meant?
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February 26, 2014 3:52:15 PM

The model is Asus amd 7970 925 mhz.
So my gpu is not enough right, then what gpu should I go out
Thanks for reply
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a b À AMD
a c 540 U Graphics card
a c 1167 ) Power supply
February 26, 2014 4:21:06 PM

sus_man said:
The model is Asus amd 7970 925 mhz.
So my gpu is not enough right, then what gpu should I go out
Thanks for reply


I asked about your specific model of Radeon HD 7970 because I was trying to determine if the card is using AMD's reference clock speeds or if the card is using factory overclocked clock speeds.

Factory overclocked cards may consume a lot more power than AMD reference clocked cards.

It is your Cooler Master GX 750W that is the problem, not your current graphics card. The Cooler Master GX 750W doesn't have sufficient maximum combined +12 Volt continuous current capacity to power your system configuration with both the Radeon R9 280X and Radeon HD 7970.

You need a better PSU.

Total Power Supply Wattage is NOT the crucial factor in determining if a power supply is able to properly power the system!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.
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