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Author Topic: Best card combo for a 600W powersupply  (Read 970 times)
Frogwithcancer
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May 24, 2013, 10:24:05 AM
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Hi all

I currently have a 600W power supply running an I7 2600K, 8GB memory (2 sticks), 1 120MM case fan and a 140MM case fan with a 6850 and a 5850

I was wondering about putting in a 7950 but am thinking that my PSU will need an upgrade.

Can i put in a 7950 to replace my 6850 without changing my PSU?
Would be able to put 2 7950's in place of my current cards?

Thank you
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Dervana
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May 24, 2013, 10:34:31 AM
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Hey, let people know what voltage you have on the 12 rail  Wink
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May 24, 2013, 10:44:38 AM
 #3

i7 2600k - 95W
ATI 6850 - 125W
ATI 5850 - 150W

Your current power usage are already conservatively at 370W.

Putting a 200W GPU in there, would be putting yourself that bit closer to the max of that power supply.

Unless it's a very high quality one, it most likely will not cope with the power requirements.
You need more wriggle room, as power supply's are only about 85-95% efficient and over using one voltage line, will go over what it is rated for.

In your position, if your consider putting very powerful multiple GPU's, I'd only do so with more info about your power supply.

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May 24, 2013, 11:03:04 AM
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i7 2600k - 95W
ATI 6850 - 125W
ATI 5850 - 150W

Your current power usage are already conservatively at 370W.

Putting a 200W GPU in there, would be putting yourself that bit closer to the max of that power supply.

Unless it's a very high quality one, it most likely will not cope with the power requirements.
You need more wriggle room, as power supply's are only about 85-95% efficient and over using one voltage line, will go over what it is rated for.

In your position, if your consider putting very powerful multiple GPU's, I'd only do so with more info about your power supply.

Wrong.
I don't know why PSUs are the most consistently misunderstood pieces of hardware, but I see this so often, it hurts.

Quality PSUs are rated at XXXW Continuous, meaning they can deliver XXXW 24/7. Non-quality PSUs are junk and shouldn't be used at all.

A PSUs efficiency has nothing to do with what it is rated to deliver, it has to do with conversion efficiency (your PC uses DC, and your house delivers AC, there is an AC/DC conversion, and there is where efficiency comes into play).

2 7950s on a 600W PSU should be fine, a 5850 and 7950 even more fine (even though sometimes they do not play nicely together), but do maintain care that you are not aggressively overclocking, as your system (CPU, mobo, HD, fans, little LED lights, beverage warmers, etc) all take up power as well, and you do want to leave the "wriggle room" above to make suer you don't blow nothin.

os2sam
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May 24, 2013, 11:30:07 AM
 #5

Hi all

I currently have a 600W power supply running an I7 2600K, 8GB memory (2 sticks), 1 120MM case fan and a 140MM case fan with a 6850 and a 5850

I was wondering about putting in a 7950 but am thinking that my PSU will need an upgrade.

Can i put in a 7950 to replace my 6850 without changing my PSU?
Would be able to put 2 7950's in place of my current cards?

Thank you

It's a bad idea to mix 5xxx/6xxx GPU's with 7xxx in the same system.  Each takes a different Catalyst/OpenCL combo to mine effectively.  What works good for one series is bad for the other.

So putting two 7xxx GPU's into your system would be best then you could send your 5850 to me Smiley

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Frogwithcancer
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May 24, 2013, 11:56:53 AM
 #6

Good point I forgot to mention my power supply.
It's a Corsair 600W CX Builder Series 80 Plus Bronze
http://www.ebuyer.com/269259-corsair-600w-cx-series-v2-psu-6x-sata-2x-pci-e-cmpsu-600cxv2uk
or
http://www.corsair.com/builder-series-cx600.html


I'm also mining scrypt so i'm guessing the 3GB cards would be better than the 2GB ones?

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