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psu for sli 570

rossgreenlees

rossgreenlees

rossgreenlees

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Joined
14 Oct 2010
Posts
64
got myself a direct cu II 570 and was wondering if i went sli would i need to get a beefier psu

also as the asus is a triple slot would i be better getting a ref 570 as the top card and the CUII as the bottom card so that it doesnt exhaust hot air onto the other card

cheers for any replies :D

Rig is

i5 2500k @ 4.2
6gig xms3 (1600mhz)
60gig ssd
1tb hdd
Corsair HX 650
 
rossgreenlees said:
got myself a direct cu II 570 and was wondering if i went sli would i need to get a beefier psu
what's you current PSU and how old is it?

also as the asus is a triple slot would i be better getting a ref 570 as the top card and the CUII as the bottom card so that it doesnt exhaust hot air onto the other card
you don't really have much of an option, but yes, a ref car would be best

cheers for any replies :D
Click to expand...

EDIT: your PSU will be fine but i think you'll need to use the molex adapters. personally, i'd buy a new PSU to be on the safe side :)

EDIT2: 6GB XMS3 with sandybridge? WTF?
 
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No the hx650 is fine, it has 4x 6+2 pins. Im running 2 5870's on it and its fine, never had a problem with it. I think you will be fine running dual 570's
 
Um... 570 SLI will push 600watt on a i5/7 setup in a fair few games, tho the HX650 is a good unit and can prolly do 700+watt ok I'd still rather have a good quality 850watt PSU so your not pushing it to the edge, pushing a PSU that hard means it runs hotter, louder and increased effects from power ripple, etc. that will shorten the life of components.
 
Rroff said:
Um... 570 SLI will push 600watt on a i5/7 setup in a fair few games, tho the HX650 is a good unit and can prolly do 700+watt ok I'd still rather have a good quality 850watt PSU so your not pushing it to the edge, pushing a PSU that hard means it runs hotter, louder and increased effects from power ripple, etc. that will shorten the life of components.
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It will pull around 600w from the wall but that isnt the stress on the PSU.

The psu will have around 80% efficiency which means the actual stress on the PSU rails will be around the 500w mark.

I had the same thoughts as you when I got a second 5870 and was assured that this is the case.
 
gregl342 said:
It will pull around 600w from the wall but that isnt the stress on the PSU.

The psu will have around 80% efficiency which means the actual stress on the PSU rails will be around the 500w mark.

I had the same thoughts as you when I got a second 5870 and was assured that this is the case.
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As i said, it will be ok, but i'd still get a new PSU now and sell the old one.
 
gregl342 said:
It will pull around 600w from the wall but that isnt the stress on the PSU.

The psu will have around 80% efficiency which means the actual stress on the PSU rails will be around the 500w mark.

I had the same thoughts as you when I got a second 5870 and was assured that this is the case.
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True enough but I'd still rather have a bit more overhead on the PSU to keep it running as cool and quiet as possible:

http://www.corsair.com/media//hx650-N-chart.png

As your climbing up to around 500watt the noise increases a lot and its having to work harder in general, as a temp measure its probably fine as they are good little units, but for long term I'd rather have something thats working a little less to maintain power output.
 
rossgreenlees said:
so i should be ok then, but probably best to upgrade the psu to be safe

yes

anythoughts on which card should run on top?
has to be the reference card depending on the spacing with your mobo. seperate the card as much as possible

and the ram is 3x2 GB
WTF? lol. You need to take on stick out :)
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Rroff said:
True enough but I'd still rather have a bit more overhead on the PSU to keep it running as cool and quiet as possible:

http://www.corsair.com/media//hx650-N-chart.png

As your climbing up to around 500watt the noise increases a lot and its having to work harder in general, as a temp measure its probably fine as they are good little units, but for long term I'd rather have something thats working a little less to maintain power output.
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well i suspect my system is pulling around the same if not more than the OP's and honestly at full load (furmark pulls the most power (more than any game)) the psu is still inaudible and the rest of my system is dead silent :D and your right, heat is not an issue either.
 
gregl342 said:
well i suspect my system is pulling around the same if not more than the OP's and honestly at full load (furmark pulls the most power (more than any game)) the psu is still inaudible and the rest of my system is dead silent :D and your right, heat is not an issue either.
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Tho the 570s are more power efficent (or limited rather) than the 480s a set in SLI can still pull 100 even 150watt more than 5870 crossfire IIRC.
 
In game my sig in spec is drawing 630w at the wall, psu is a corsair hx850w. Draw with furmark is around 740w.
 
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