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Crossfire 6870's

post #1 of 6
Thread Starter 
There was a deal on the marketplace that i wasn't able to pass up on an 6870. So i got myself an early Christmas present smile.gif

Im afraid i may have gotten alittle ahead of myself, because after doing some research, some people suggest that a 750watt PSU is the minimum for any crossfire configuration.

I am running an Antec HighCurrent 620.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371048

Stock 6870's Draw up to 151watts at 1.175v 900/1050. My current 6870 runs at 1.12v 900/1000(folding). I hope to clock my new one the same. So im guessing it is drawing a few watts less then 151w.

Ive settled my 8120 @ 4.5@1.375v for 24/7 use.

6870 - 150w
6870 - 150w
8120 - 175w
=475 baseline

My question is pretty straight forward, is that PSU going to be able to handle my rig? Or do i need something beefier.
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Vishera
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post #2 of 6
Yeah your PSU will be fine. I know for a fact that a Corsair TX650 runs fine on an overclocked 2600k and crossfire 6870's so your PSU should be fine.
post #3 of 6
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post #4 of 6
Quote:
Originally Posted by Hatchet View Post

There was a deal on the marketplace that i wasn't able to pass up on an 6870. So i got myself an early Christmas present smile.gif

Im afraid i may have gotten alittle ahead of myself, because after doing some research, some people suggest that a 750watt PSU is the minimum for any crossfire configuration.

I am running an Antec HighCurrent 620.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371048

Stock 6870's Draw up to 151watts at 1.175v 900/1050. My current 6870 runs at 1.12v 900/1000(folding). I hope to clock my new one the same. So im guessing it is drawing a few watts less then 151w.

Ive settled my 8120 @ 4.5@1.375v for 24/7 use.

6870 - 150w
6870 - 150w
8120 - 175w
=475 baseline

My question is pretty straight forward, is that PSU going to be able to handle my rig? Or do i need something beefier.


The PSU has enough wattage to supply 2x 6870s but it only has 2x 6-pin PCIe power connector. Each 6870 will need 2x 6-pin PCIe. You can use the 4-pin molex to 6-pin adapter that comes with the cards.

 

Or, get a PSU that has atleast 4x 6+2-pin PCIe if you decide to upgrade.

 

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ケンジ
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by TheOddOne View Post

Use this and decide for yourself:
http://www.overclock.net/t/1045231/phaedrus-quickndirty-psu-calculator

I plugged everything into that calculator and it came to 625w without overclock, 675w with.
So according to that, i will need more wattage.
Quote:
Originally Posted by Ken1649 View Post





The PSU has enough wattage to supply 2x 6870s but it only has 2x 6-pin PCIe power connector. Each 6870 will need 2x 6-pin PCIe. You can use the 4-pin molex to 6-pin adapter that comes with the cards.

Or, get a PSU that has atleast 4x 6+2-pin PCIe if you decide to upgrade.

Yes, i was aware that i was going to have to use the adapter, while cumbersome, it isnt enough reason for me to upgrade by itself.



Well, im getting mixed reports. I really dont want to burn the PSU out, but i cant really swing the funds to get a ~800watt atm.

Will it make a big enough difference if i clock down my cpu alittle more, and undervolt both gpu's? I can limp by till i get my tax return smile.gif
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Vishera
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post #6 of 6

You should be fine if you don't clock the 2x GPUs. It's when you overclock and depends on how far you want to go, that's when you need a bigger PSU.

ケンジ
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Hard DriveHard DriveCoolingCooling
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ケンジ
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CPUCPUMotherboardGraphics
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Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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