Sign in with
Sign up | Sign in
Your question

Power Supply for Xfire 6870s or Xfire 5770s | Need Advice |

Tags:
  • Radeon
  • Power Supplies
  • Final Fantasy
  • Games
  • Graphics
  • Product
Last response: in Graphics & Displays
Share
November 4, 2010 10:45:12 PM

I need a reliable power supply, because I have a 500w, and obviously that is probably not enough for one 6870.

How much would I need to crossfire two 6870's safely?

1000w? 750w?

On a seperate note, could two XFX 5770's run Final Fantasy XIV (Or a current game, like when Crysis was new) on high/max settings? And what power supply would those need?

One of my cards did about 2500-2800 (Score on FF XIV bench marker) With 1500 or below being insufficient to run the game.

Basically asking because I currently have a 5770, and am looking to upgrade so I can run Final Fantasy on max settings. And two 5770's vs two 6870's is a $350 price difference.

Inside of the spoiler is the scores for the benchmarking tool. (Free, just google final fantasy xiv benchmarking tool)

Spoiler
[8000 and over] Extremely High Performance
Easily capable of running the game on the highest settings.
[5500–7999] Very High Performance
Easily capable of running the game. Should perform exceptionally well, even at higher resolutions.
[4500-5499] High Performance
Easily capable of running the game. Should perform well, even at higher resolutions.
[3000-4499] Fairly High Performance
Capable of running the game on default settings. Consider switching to a higher resolution depending on performance.
[2500-2999] Standard Performance
Capable of running the game on default settings.
[2000-2499] Slightly Low Performance
Capable of running the game, but may experience some slowdown. Adjust settings to improve performance.
[1500-1999] Low Performance
Capable of running the game, but will experience considerable slowdown. Adjusting settings is unlikely to improve performance.
[Under 1500] Insufficient Performance
Does not meet specifications for running the game.

More about : power supply xfire 6870s xfire 5770s advice

November 4, 2010 11:42:42 PM

Bump: Still wondering...I tried googling the power demands from the crossfire, but I couldn't find a solution
m
0
l
November 5, 2010 12:18:59 AM

High end CPU = 125W load
Average system with 2HDs and 1 optical and a few fans = 75W

Single 5770 load = 110W
Double 5770 load = 220W
Single 6850 load = 130W
Double 6850 load = 260W
Single 6870 load = 150W
Double 6870 load = 300W

So with a dual 6870 and average system with a Core i7 930 or a phenom x6 1090t you will probably barely break 500W at load.

You want some headroom, so lest say you go for 80% PSU load, you will want at least a 630W, preferably a 650W PSU.

You can calculate the rest.
m
0
l
Related resources
November 5, 2010 1:17:50 AM

Thanks a lot vilen!
m
0
l
November 5, 2010 1:55:49 AM

1+vilenjan. iv used Crossfire 5770 with an OC'ed Phenom II 955 and 3 Hard drives. all on an Antec earthwatts 650w PSU
m
0
l
November 5, 2010 3:13:59 AM

I am running a Athlon II 630 OCed to 3.3 with 4gb ram and a 5770 on a corsair 550W and even under load my PSU never gets warm.

I am pulling less than 300W at load.

Make sure you have a qaulity PSU.

Corsair, Antec, Seasonic, Silverstone are all top rated PSUs.

XFX, Cooler Master are also good.

go for 80% efficiency minimum (bronze or higher are better but you will pay for that).

m
0
l
November 6, 2010 1:32:54 AM

Setrax said:
I need a reliable power supply, because I have a 500w, and obviously that is probably not enough for one 6870.

How much would I need to crossfire two 6870's safely?

1000w? 750w?

On a seperate note, could two XFX 5770's run Final Fantasy XIV (Or a current game, like when Crysis was new) on high/max settings? And what power supply would those need?

One of my cards did about 2500-2800 (Score on FF XIV bench marker) With 1500 or below being insufficient to run the game.

Basically asking because I currently have a 5770, and am looking to upgrade so I can run Final Fantasy on max settings. And two 5770's vs two 6870's is a $350 price difference.
[/spoiler]




...
hey you can find other place on google just look up "PC power calculator" in the serach

http://www.antec.outervision.com/





to me you need about 700/ 750 for good cooling and safe stable operation if you have more 3 to 6 hard drive and usb hooks ups like me.

they are cheap now days

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

look at total watts in pictures is what I do


http://www.newegg.com/Product/ImageGallery.aspx?CurImag...






m
0
l
November 6, 2010 1:38:27 AM

I would suggest a 650W of a good brand (corsair for example) and it will run 2x 6870 with ease.

Im running 5850CF (which takes more power than 6870) on a corsair TX650 and its working fine :) 
m
0
l
a b ) Power supply
November 6, 2010 8:00:13 AM

Setrax said:
Bump: Still wondering...I tried googling the power demands from the crossfire, but I couldn't find a solution

Quote:
Don't...

* Post in ALL CAPS or use excessive punctuation!!!
* Share personal information, like your email address. Identify theft is real.
* Bump posts, claim "first!"
* Hijack a topic. Stick to the original conversation.
* Ask for help pirating, cracking passwords, or bypassing copyright protection
m
0
l
!