Go Back   Hardware Canucks > HARDWARE > Video Cards

    
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old February 13, 2012, 12:43 PM
Rookie
 
Join Date: Nov 2011
Location: Labrador City, NL
Posts: 34

My System Specs

Default What size PSU do i need?

I have a ax850 watt PSU and i was wondering if it is big enough to power 2 7970?

My current system config:

Asus Rampage IV Extreme
AX850 Watt
Intel i7 3930k @ 4.25 GHz
16 Gigs of ram from G.Skill
GTX 590


I do not really want to change my video card. I am just wondering to make a cost estimate!

Thanks for your reply!
Reply With Quote
  #2 (permalink)  
Old February 13, 2012, 01:24 PM
stoanee's Avatar
Hall Of Fame
F@H
 
Join Date: Jun 2007
Location: Lacombe Alberta
Posts: 3,248

My System Specs

Default

Well, looks like 2 x 7970 at load pulls 700+ watts. Personally I would bump up my psu wattage.
__________________
heatware
Reply With Quote
  #3 (permalink)  
Old February 13, 2012, 02:48 PM
bigFOIG's Avatar
MVP
F@H
 
Join Date: Apr 2011
Location: Vancouver, B.C.
Posts: 426

My System Specs

Default

It'll work, I'll tell you that!
__________________
Reply With Quote
  #4 (permalink)  
Old February 13, 2012, 03:00 PM
Rookie
 
Join Date: Nov 2011
Location: Labrador City, NL
Posts: 34

My System Specs

Default

Alright! But will it work for more then 2 minutes lol? Like i mean will it actualy work with no risk?

Another theory/question i got is this: GeForce USUALLY i said USUALLY makes cards that are quieter and pull less power, do you think the 600 series will follow the same trend? Quieter and less power consumption??


Cause if that works out like that and the cards look pretty good, i might go and buy 2 GeForce cards! :P
Reply With Quote
  #5 (permalink)  
Old February 13, 2012, 03:22 PM
dandelioneater's Avatar
Hall Of Fame
F@H
 
Join Date: Dec 2010
Location: Kelowna, BC
Posts: 1,114

My System Specs

Default

Quote:
Originally Posted by Monster1307 View Post
Another theory/question i got is this: GeForce USUALLY i said USUALLY makes cards that are quieter and pull less power, do you think the 600 series will follow the same trend? Quieter and less power consumption??
Actually in the last few card generations, Geforce cards have been a bit more power hungry than their amd counterparts: example (gtx 480 vs 5870) But they performed a bit better too.

850W is fine for 2 high end geforce cards. If you are going to run the system at full load (folding) 24/7 then maybe a 1000W unit would be better, but 850 will be fine for regular use.
__________________
Reply With Quote
  #6 (permalink)  
Old February 14, 2012, 04:56 AM
Hall Of Fame
 
Join Date: Jun 2009
Location: Nova Scotia
Posts: 2,846

My System Specs

Default

I would say you are good to go on the 850w.

The latest HWC review of an OC Gigabyte 7970 with an i7 920 @4.0ghz pulled 361w (that is the whole system). So even if that doubled with a second card (which it won't) you would still have a bit of headroom.

__________________
Desktop: Antec Three Hundred, Z77-D3H, 3570K undervolt @4.1ghz with Zalman Optima Cooler, Corsair Vengeance 2x4gb@1866mhz, MSI Cyclone GTX 460, Seasonic S12II 500W, WD Black 1TB, Intel 530 120GB
Away from home light Gamer: Acer Aspire 15.6", A8-3500m undervolt and OC to 2Ghz, 2x4gb Corsair Vengeance, Crucial M500 240gb
Reply With Quote
  #7 (permalink)  
Old February 17, 2012, 01:55 PM
Rookie
 
Join Date: Nov 2011
Location: Labrador City, NL
Posts: 34

My System Specs

Default

Alright!!!!! Thanks everyone!! But i got one more question!! What would be the performance upgrade if i would do it?
Reply With Quote
  #8 (permalink)  
Old February 17, 2012, 02:11 PM
Adzsask's Avatar
Allstar
F@H
 
Join Date: Dec 2011
Location: SK
Posts: 831

My System Specs

Default

Quote:
Originally Posted by Monster1307 View Post
Alright!!!!! Thanks everyone!! But i got one more question!! What would be the performance upgrade if i would do it?
Cleaner power= longer hardware life, if your pushing your PSU to 80%+ when loading it is going to have some ripple, most go overboard to keep load% down, and also keeps efficiency.
Reply With Quote
  #9 (permalink)  
Old February 17, 2012, 06:22 PM
486's Avatar
486 486 is offline
MVP
 
Join Date: Nov 2008
Posts: 394

My System Specs

Default

Non-overclocked 7970 does not consume more than 200W. 2600 with 2x7970 will consume no more than 600W. Seasonic 650 will handle it with ease.
If you are pushing your PSU to 90%-100% of load, the lifepspan of PSU still going to be longer than its useful life (connector/specs wise).
Sure, if you have cheap PSU, even 1000W won't be enough.
__________________
Silverstone TJ-08E
Seasonic X-660
Asus P8Z77-M Pro
Intel i7-3770
Kingstone HyperX 2 x 8GB
Crucial M4 256GB + 128 GB
Sapphire Radeon HD7970
Nec Multisync LCD2690WUXI
Reply With Quote
Reply


Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
what size psu jimmyb007 Power Supplies 6 January 3, 2012 09:22 AM
Help with fan size biagio1661 Air Cooling 5 October 25, 2011 02:07 PM
Gtx 275 vs gtx 570 size coalminer071 Video Cards 8 October 14, 2011 11:30 AM
Antec PSU size fit sankukai Power Supplies 9 March 2, 2011 10:36 PM
Rad Size homer98 Water Cooling 11 December 10, 2010 08:33 AM