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-   -   Watts needed for SLI? (http://www.hardwarecanucks.com/forum/power-supplies/50060-watts-needed-sli.html)

b1ack1otus January 3, 2012 10:14 PM

Watts needed for SLI?
 
This question may appear redundant but I am planning to build my first PC rig, and the last thing I want is not have enough power to run my computer.

I was looking at getting the GTX 560/ti and I checked the nVidia website and they said minimum power requirement is 450 W.
GeForce GTX 560 - Specifications - GeForce

My question now is, how do I calculate what the minimum power is needed when another GTX 560/ti is added?

In general, how do you calculate those ratios for future reference?

gingerbee January 3, 2012 10:18 PM

find out what the cards draws just for itself and add it ( they say 450 for the card and the rest of your pc and i always like to go a littler higher then what they say ) if it was me running sli 560's min would be a good 750 or 800 watter my2cents

enaberif January 3, 2012 10:20 PM

650-750w would be plenty

Bond007 January 4, 2012 04:23 AM

Personally I would say 650w min for sli gtx 560 non Ti and 750 for sli gtx 560Ti.

Soultribunal January 4, 2012 05:17 AM

Without knowing what the rest of your setup will be, I will say 650W should suffice. I run a hot old i7 with 460's in SLI and a 430 PhysX on a HX650W unit. THe 560TI's are only 10W higher TDP than my 460's so you should have no worries if you get a Quality 650 unit.

-ST

b1ack1otus January 4, 2012 06:41 AM

I guess you guys are all speaking from experience. I appreciate your reply guys.

And soultribunal, I am waiting for the new release for the ivy bridge, and planning to get the core i5 K series.

Correct me if I'm wrong, but the PC components that draws the most power would be the graphics card and cpu itself right?

Soultribunal January 4, 2012 07:40 AM

Quote:

Originally Posted by b1ack1otus (Post 586260)
I guess you guys are all speaking from experience. I appreciate your reply guys.

And soultribunal, I am waiting for the new release for the ivy bridge, and planning to get the core i5 K series.

Correct me if I'm wrong, but the PC components that draws the most power would be the graphics card and cpu itself right?

Yuppers. Unless you are like our resident Storage GURU (AkG) and have 20 HDD's in a Rig the biggest components for power draw are your CPU and GPU's.

According to my UPS I draw 488 at Full load so that should give a good baseline.
And if you are going IVY then you will have even less power consumption vs what I run.

Get yourself a good Quality unit and you should have zero issues.

-ST

Slik January 4, 2012 10:04 AM

Don't scrimp with the PSU. The difference in price from a 600 to 800 watt unit is so minimal,it's a waste getting anything less than 800 watts for SLI and any future add ons.

b1ack1otus January 4, 2012 03:03 PM

Well Slik, I do have tight budgets and was planning to spend around 100 dollars on a PSU unit, if not less. So I guess I am just looking for the "minimal" amount to fit the budget. And I am looking for a good quality brand like Corsair or XFX. Any other suggestion of good quality brand name for PSU?

Soultribunal January 4, 2012 04:19 PM

If I had to choose:

Seasonic S12II 620W EPS12V 20/24PIN ATX Power Supply Active PFC 80+ Bronze 6+8PIN PCI-E W/ 120MM Fan - Seasonic Electronics - S12II 620


Corsair TX650 V2 650W ATX 12V Single Rail 53A 24PIN ATX Power Supply Active PFC 80PLUS Bronze - Corsair - CMPSU-650TXV2

XFX 650W PRO650W Core Edition Single Rail ATX 12V 53A 24PIN ATX Power Supply 80PLUS Bronze PSU - XFX - P1650SNLB9

With a 100 budget at least. 125-150 gets you a little higher up.

-ST


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