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PSU enough for two 7950s - Page 3

post #21 of 29
Thread Starter 
Criss I heard that the earlier model ATI cards were less power efficient than today's model but that could be wrong, anyway I got time to save I'm only gonna CF if I can't max BF4 and by then I will be able to afford a TX750 aswell smile.gif
post #22 of 29
Quote:
Originally Posted by xCorzza View Post

Criss I heard that the earlier model ATI cards were less power efficient than today's model but that could be wrong, anyway I got time to save I'm only gonna CF if I can't max BF4 and by then I will be able to afford a TX750 aswell smile.gif

You can get shutdowns if the PSU can't provide the power its rated at. A bad PSU may only be able to provide half of what its rating is before it quits.

BTW.... The 475w version of your PSU didn't get a good review from HS... Something to think about before you stress it.

http://www.hardwaresecrets.com/article/Cooler-Master-Extreme-2-475-W-Power-Supply-Review/1550
post #23 of 29
Quote:
Originally Posted by xCorzza View Post

Criss I heard that the earlier model ATI cards were less power efficient than today's model but that could be wrong, anyway I got time to save I'm only gonna CF if I can't max BF4 and by then I will be able to afford a TX750 aswell smile.gif

I wouldn't even try and xfire with it. At best it'll shut down. At worst, it can short circuit or burn, either way it can damage anything connected to it.
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post #24 of 29
Thread Starter 
Yea if I do CF ill just get a TX750
post #25 of 29
The fact that you * think* you have a 625W simply tells me that you need more W. Good branded PSU of 625W will be enough with no OC and a 1155 socket. Now depending onj your rig it could somply fall short...
post #26 of 29
Quote:
Originally Posted by xCorzza View Post

Criss I heard that the earlier model ATI cards were less power efficient than today's model but that could be wrong
The 4890 consumed 190W whereas the 7950 consumes 200W so theoretically if I had an issue with 750W under load, 750W may not be enough. I only stress getting a higher wattage because if it doesn't end up being enough then that's money wasted.
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post #27 of 29
Thread Starter 
Makes sense, and I DO have a 625w coolermaster exteme 2, I checked. My rig
MSI B75A-G43
I5 3570K @ 3.8GHz
250GB HDD
160GB HDD
1 case fan
Deep cool gammax 200 or something
1 DVD writer
Gigabyte 7950
PCI-E network card


My plans are to get an 128 GB SSD, and another 7950 if I can't max BF4
post #28 of 29
Quote:
Originally Posted by criss969 View Post

The 4890 consumed 190W whereas the 7950 consumes 200W so theoretically if I had an issue with 750W under load, 750W may not be enough. I only stress getting a higher wattage because if it doesn't end up being enough then that's money wasted.

ur nehalem i7 pulls a lllloottttt more than his ivy bridge i5 .

http://www.guru3d.com/articles_pages/radeon_hd_7950_overclock_guide,3.html

Measured power consumption default card

System in IDLE = 165W
System Wattage with GPU in FULL Stress = 300W
Difference (GPU load) = 135W
Add average IDLE wattage ~3W
Subjective obtained GPU power consumption = ~ 138 Watts
Mind you that the system wattage is measured at the wall socket.

Measured power consumption overclocked at 1020 MHz (no voltage tweaking)

System in IDLE = 165W
System Wattage with GPU in FULL Stress = 309W
Difference (GPU load) = 144W
Add average IDLE wattage ~3W
Subjective obtained GPU power consumption = ~ 147 Watts


Measured power consumption overclocked at 1150 MHz (with 1.25 Volts)

System in IDLE = 167W
System Wattage with GPU in FULL Stress = 381W
Difference (GPU load) = 214W
Add average IDLE wattage ~3W
Subjective obtained GPU power consumption = ~ 217 Watts


Mind you that the system wattage is measured at the wall socket and the GPU 100% stressed.


You only need a quality 650 watts for dual 7950s.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263


Here you go its on sale with a rebate. amazing deal!

If u really want a 750 for comforts sake then here are some good power supplies

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182133
http://www.newegg.com/Product/Product.aspx?Item=N82E16817116019
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151107
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341052
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703027
Edited by Quesoblanco - 4/6/13 at 6:38pm
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post #29 of 29
you don't need 2 7950s to max bf3. even mp. the problem is you can't oc with your board. you'd be better off getting a board that would allow to oc your chip. depending on the resolution but if you've got 1080 it is possible to max bf3 if only you can oc your chip to at least 4.4GHz. you may not even have to oc the gpu

edit: ops, my bad. bf4? i saw the preview . . . still . . . a 7950 with a slight oc may work. the new gigabyte comes with 1000 MHz core but i still suggest you get a better board.
Edited by rdr09 - 4/6/13 at 6:54pm
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