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PSU for Xfire 6870s and i5 2500K

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December 15, 2011 2:01:33 PM

OK, i'm going to get new PC, i wonder if this(http://www.newegg.com/Product/Product.aspx?Item=N82E168...) PSU would be enough to power up

i5 2500 K
1TB HDD, Seagate (7200)
16GB DDR3 (Kingston HyperX)
2x Gigabyte 6870's in Crossfire
Z68 based Gigabyte Motherboard
MAYBE (most probably not but..) random DVD-RW.

More about : psu xfire 6870s 2500k

a b ) Power supply
December 15, 2011 2:17:45 PM

yes it should do it

from amd.com
(600 Watt and four 6-pin connectors for AMD CrossFireX™ technology in dual mode)
a c 1200 ) Power supply
December 15, 2011 5:29:45 PM

No. It's only enough for a single Radeon HD 6970 graphics card.

For a system using two Radeon HD 6970 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 800 Watt or greater power supply. The power supply unit should also have a combined +12 Volt continuous current rating of 63 Amps or greater and have at least two 6-pin and two 8-pin PCI-Express supplementary power connectors.

The OCZ ModXStream Pro 700W (OCZ700MXSP), with its combined +12 Volt continuous current rating of 46 Amps and one 6 pin and one 6+2 pin PCI Express power connectors is only sufficient for powering a system with a single Radeon HD 6970.

You may find power supplies on the market that supply more than enough Wattage to theoretically run the system. However, many of them lack the Amperage capacity on the critical +12 Volt rail, which is necessary to support that claimed Wattage.

The two devices that consume the majority of the power, within the computer, are the CPU and the GPU. Both of these devices obtain all of their power from the +12 Volt rail(s). If this critical rail is unable to supply enough power to these two components the system is not going to run properly.

What is your power supply budget?
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December 15, 2011 5:58:58 PM

unfortunantly i only have 2 6870's not 6970s :) 
a c 1200 ) Power supply
December 15, 2011 6:27:02 PM

dotnix said:
unfortunantly i only have 2 6870's not 6970s :) 

Sorry, I glanced at your GPU spec too quickly.

The OCZ ModXStream Pro 700W (OCZ700MXSP) still doesn't have enough PCIe power connectors. The two PCIe power connectors, that it does have due to its weak +12 Volt rails, is all wired to the same rail (i.e. the +12V2 rail) along with the 4-pin Molex peripheral power connectors and SATA power connectors. Powering two Radeon HD 6870 off of that one rail will definitely cause you problems you don't want to have to deal with especially when it can be avoided altogether by purchasing a better power supply unit.
December 16, 2011 5:13:29 AM

ko888 said:
Sorry, I glanced at your GPU spec too quickly.

The OCZ ModXStream Pro 700W (OCZ700MXSP) still doesn't have enough PCIe power connectors. The two PCIe power connectors, that it does have due to its weak +12 Volt rails, is all wired to the same rail (i.e. the +12V2 rail) along with the 4-pin Molex peripheral power connectors and SATA power connectors. Powering two Radeon HD 6870 off of that one rail will definitely cause you problems you don't want to have to deal with especially when it can be avoided altogether by purchasing a better power supply unit.



Thanks!
any particular PSU you'd recommend for this setup?
December 16, 2011 6:35:51 AM

dotnix said:
OK, i'm going to get new PC, i wonder if this(http://www.newegg.com/Product/Product.aspx?Item=N82E168...) PSU would be enough to power up

i5 2500 K
1TB HDD, Seagate (7200)
16GB DDR3 (Kingston HyperX)
2x Gigabyte 6870's in Crossfire
Z68 based Gigabyte Motherboard
MAYBE (most probably not but..) random DVD-RW.



if u on budget it is best psu in its price range and it can deliver what u really need.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...


but if you are a very very very ultra extreme hardcore gamer then dont buy it. :non:  :non:  :non: 

:sol:  :sol:  :sol: 
December 16, 2011 7:02:25 AM

Quote:
if u on budget it is best psu in its price range and it can deliver what u really need.

http://www.newegg.com/Product/Prod [...] 20gs%20800


Thanks, i'll stick to this.
:bounce: 
a c 87 ) Power supply
December 16, 2011 12:25:02 PM

vdr369 said:
if u on budget it is best psu in its price range and it can deliver what u really need.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

It is far from the best PSU in its price range. It is only 80Plus certified, you can get Bronze, Silver or even Gold rated units. It is not modular, below are four options which are modular.

These are all better:

Rosewill Capstone 750W 80Plus Gold $120
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

NZXT Hale82 750W 80Plus Bronze Modular $120
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair 750TXM 80Plus Bronze Modular $130 ($15 rebate, $6 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Silverstone Strider Plus 750W ST75F-P 80Plus Silver Modular $130 ($10 rebate, $10 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thermaltake Toughpower XT 775W 80Plus Silver Modular $120 ($6 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

XFX Pro 850W Core Edition 80Plus Bronze $120 ($30 rebate, $6 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair 750TXV2 80Plus Bronze $105 ($10 rebate)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
December 16, 2011 4:18:25 PM

i5 2500k and sli gtx 560 or gtx 460 dont but ati in this range
!