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Cf 7970 650w?

Last response: in Graphics & Displays
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July 8, 2012 9:41:35 AM

so is it true i wont be able to cf a 7970 with this power supply http://www.amazon.com/Corsair-Enthusiast-Certified-Comp...

CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

i'm using atm i5 2500k oc 4.8ghz 1 ssd m4 cru,1tb,evo 212,and Sony 24X optical drive

More about : 7970 650w

a c 555 U Graphics card
a c 1186 ) Power supply
July 8, 2012 5:25:04 PM

What is the make and model of the Radeon HD 7970 cards? They don't all draw the same amount of power.

The Radeon HD 7970 GHz Edition draws more power than the original Radeon HD 7970 925 MHz edition.

Are the graphics cards being overclocked beyond their factory clock speeds? If yes then what clock speeds are you using?

My initial assessment would be a no to the TX650 V2 being able to power two Radeon HD 7970 cards in 2-way CF with a heavily overclocked i5-2500K.
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July 8, 2012 7:52:51 PM

it will be the SAPPHIRE Radeon HD 7970 OC 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card (11197-01-40G) and i will prob just oc the 7970 to about 1.1-1.2mhz
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a c 1401 U Graphics card
a c 709 ) Power supply
July 8, 2012 8:00:04 PM

It is to close for comfort on that PSU!
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July 8, 2012 8:00:07 PM

and k i will just buy a new psu. what would be a good psu under 120$ was going for 2 gtx 670 but i read 7970 is better for my resolution 5760x1080
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a c 1401 U Graphics card
a c 709 ) Power supply
July 8, 2012 8:03:35 PM
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July 8, 2012 8:08:35 PM

xfx it is but the power cooling has better reviews .
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a c 1401 U Graphics card
a c 709 ) Power supply
July 8, 2012 8:12:45 PM

They are both quality PSU's, take the reviews on the EGG with a grain of salt since more people that have problems post a review than people that everything works fine do. Both PSU's got good reviews at respectable techsites.
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July 8, 2012 8:57:11 PM

No way would I recommend putting two 7970s and an overclocked CPU on a 650W PSU. You might be able to get away with it, but it's definitely not good... you'll be maxing out that PSU under load.

Much better to upgrade to an 850W+ unit in order to both have overclocking flexibility and headroom on the 7970s as well as ensure you don't fry your PSU in a year or so.
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a c 555 U Graphics card
a c 1186 ) Power supply
July 8, 2012 9:50:31 PM

mrwil said:
it will be the SAPPHIRE Radeon HD 7970 OC 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card (11197-01-40G) and i will prob just oc the 7970 to about 1.1-1.2mhz

A single Sapphire Radeon HD 7970 OC 3GB GDDR5 at factory clocks has a power consumption of 219 Watts during gaming.

OC'ing that specific card to 1.1 GHz will increase the card's power consumption to around 240 Watts during gaming.

OC'ing that specific card to 1.2 GHz will most likely require a voltage tweak that will increase the card's power consumption dramatically to around 330 Watts during gaming. For two cards in 2-way CF you're going to be drawing over 650 Watts for just the two video cards.

For comparison two reference clocked (i.e. GPU Core: 925 MHz, Memory: 1375 MHz) Radeon HD 7970 3 GB in 2-way CrossFire mode have a measured power consumption of 375 Watts during gaming. That's just for the two video cards only, measured on the PCIe slots' +3.3V and +12V power lines and the PCIe Supplementary power connectors.

An i5-2500K overclocked to 4.8 GHz will be drawing over 155 Watts when measured at the CPU power connector. That includes the power loss due to the motherboard's CPU power VRM conversion efficiency.

I consider the XFX 850W Core Edition (P1-850S-NLB9) to be the bare minimum for your requirements. Just don't attempt to run FurMark or OCCT GPU3D stress testing because it most likely will trigger the PSU's protection circuit to kick in.
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July 9, 2012 6:11:20 AM

Best answer selected by mrwil.
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July 9, 2012 6:14:18 AM

going to go with the xfx anyways more watt and 5yr warranty so thanks @ ko888 and yea i think will run some programs to test if the oc are stable so if the PSU's protection circuit does kick in owell lol.
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July 9, 2012 6:18:02 AM

The Radeon HD 7970 GHz Edition draws more power than the original Radeon HD 7970 925 MHz edition.
Are the graphics cards being overclocked beyond their factory clock speeds? If yes then what clock speeds are you using?

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a c 272 U Graphics card
a b ) Power supply
July 9, 2012 3:02:39 PM

This topic has been closed by Mousemonkey
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