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SLI time


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#1 Eclipse581

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Posted 09 July 2011 - 06:58 PM

Hey guys I have a question for ya. I just upgraded my computer and I would like to run SLI, I never did it before so im a little nervous and what not, I dont want my computer to blow lol. My question is I have a GTX 560 ti from nvidia, do I need to buy the exact same card? or can I buy a GTX 560 ti from like EVGA or MSI. What would my power suppy have to be? And what kind of cooling would I need to get.

i5 2500k cpu
gtx 560 ti
700 watt psu
4 gig ddr3 ram

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#2 cryptodan

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Posted 09 July 2011 - 07:20 PM

Yes you need the same exact card. Why do you want to run SLi with such a powerful card?

You would need a more powerful power supply and probably bigger case.

#3 dpunisher

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Posted 09 July 2011 - 07:28 PM

Beg to differ, as long as the GPUs are the same, brand is irrelevent.

Whether or not you need a new PSU is dependant upon which 700 watt PSU you currently have. Some 700 watt PSUs will run run a GTX560 SLI setup without a sweat, many won't. Case by case basis.

Cooling- nothing special. Verify you have the room in the case, and proper ventilation. Monitor your card temps (GPU-Z or similar) when you get it set up to nip any problems early.

I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)

3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)


#4 cryptodan

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Posted 09 July 2011 - 07:43 PM

I think they are stating they already have a 700 Watt Power Supply. And according to eVGA their 560ti requires a 500 watt PSU with 30Amps total on the 12v rail. So two would require 60Amps.

For Power I would recommend this: CORSAIR Enthusiast Series TX950 (CMPSU-950TX) 950W ATX12V v2.3/EPS12V v2.91 SLI Ready 80 PLUS BRONZE Certified Active PFC Power Supply as it gives you 78amps which is 18 more then 2 required 560ti's.

CORSAIR HX Series CMPSU-1000HX 1000W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS Certified Modular Active PFC Compatible with Core i7 Power Supply has dual 40amp 12v RAILS giving you enough.

Any full tower case will work.

Edited by cryptodan, 09 July 2011 - 07:43 PM.


#5 killerx525

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Posted 09 July 2011 - 09:46 PM

Don't forget to purschase the SLI bridge :)

>Michael 
System1: CPU- Intel Core i7-5820K @ 4.4GHz, CPU Cooler- Noctua NH-D14, RAM- G.Skill Ripjaws 16GB Kit(4Gx4) DDR3 2133MHz, SSD/HDD- Samsung 850 EVO 250GB/Western Digital Caviar Black 1TB/Seagate Barracuada 3TB, GPU- 2x EVGA GTX980 Superclocked @1360/MHz1900MHz, Motherboard- Asus X99 Deluxe, Case- Custom Mac G5, PSU- EVGA P2-1000W, Soundcard- Realtek High Definition Audio, OS- Windows 10 Pro 64-Bit
Games: APB: Reloaded, Hours played: 3100+  System2: Late 2011 Macbook Pro 15inch   OFw63FY.png


#6 Eclipse581

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Posted 09 July 2011 - 10:22 PM

Ok cool thanks for all the help guys, I dont know where I would be without this website lol. The reason I was asking about needing the same brand 560 ti is because I was very impatient and bought it at best buy so I payed a lot more then I should have, and I really dont want to spend what I did again for another 560

#7 dpunisher

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Posted 09 July 2011 - 10:40 PM

I think they are stating they already have a 700 Watt Power Supply. And according to eVGA their 560ti requires a 500 watt PSU with 30Amps total on the 12v rail. So two would require 60Amps.


You are confusing the facts a bit. The whole system requires 30 amps on the 12V+ rail, not the video card. The GTX560 TDP is only ~170 watts(14 amps)/220 watts(18 amps) overclocked. By themselves, an SLIed pair pulls 30-37 amps worst case. Tack on another 160 watts for CPU/mobo/disk drives and you have a legit worst case draw of ~600 watts(50 amps), and honestly, that is erring on the high side.

Will every 700 watt PSU run a GTX560 SLI setup? NO. Some PSUs are garbage, some 700 watt PSUs can crank out 600 watts all day long and not break a sweat.

I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)

3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)


#8 cryptodan

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Posted 09 July 2011 - 10:49 PM

Then why do video card manuals and websites post that they need a power supply of a certain wattage and state the amps as such like New Egg and eVGA?

This would be the requirements for my Video Card:

System Requirements Minimum 600W or greater system power supply (with a minimum 12V current rating of 42A).

As stated by NewEgg: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130658

As stated from eVGA: Requirements Minimum of a 600 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 42 Amps.) An available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector. - http://www.evga.com/products/pdf/015-P3-1582.pdf

So to me that would mean that the video card itself would need 42 amps on the 12v RAIL to operate.

Unless i am missing something that is how I take it.

#9 dpunisher

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Posted 09 July 2011 - 11:00 PM

No, those requirements are for the whole system. I know it makes no sense because of how many variations there are in system configurations out there, but thats the fact. They (manufacturer/Newegg etc) list "system requirements", not GPU requirements. They are careful on their wording.

"System Requirements Minimum 600W or greater system power supply (with a minimum 12V current rating of 42A)" If you could actually run 42 amps through a stock cooled GTX560, it would leave a smoking crater behind.

Its screwed up, but thats the way they do things. I suppose it covers EVGA's ass since having too much PSU is better than having too little PSU, and it cuts down on RMAs because some idiot is running an overtaxed PSU with his new videocard. Newegg makes out because they can end up selling a bigger/more expensive PSU because of those overinflated specs and if pressed about it, "Well, thats what the manufacturer said".

Thats my story, and I am stickin' to it.

I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)

3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)


#10 cryptodan

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Posted 09 July 2011 - 11:06 PM

I wished they would list the actual requirements as under load and idle instead of causing confusion. Thanks for the clarification on stuff, and could you PM me the math on how to determine the actual power requirements, or where to get that information.

#11 DJBPace07

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Posted 10 July 2011 - 01:08 AM

A few things to consider about SLI, aside from the PSU requirements. In addition to greater heat generation and power consumption, multi-GPU functionality is very much driver heavy, so expect a little more CPU usage. If you buy games just as they are released, SLI profiles are often not ready on day one, additionally, these new games may not work with SLI, or Crossfire, until a patch and/or driver revision. Sometimes, even single GPU systems have issues with new releases let alone multi-GPU setups. These reasons, along with the scale of the performance increase while using SLI, are why it is suggested to use high performance cards - if something goes wrong or a game doesn't scale well with SLI, you still have good performance.

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#12 killerx525

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Posted 10 July 2011 - 04:45 AM

A few things to consider about SLI, aside from the PSU requirements. In addition to greater heat generation and power consumption, multi-GPU functionality is very much driver heavy, so expect a little more CPU usage. If you buy games just as they are released, SLI profiles are often not ready on day one, additionally, these new games may not work with SLI, or Crossfire, until a patch and/or driver revision. Sometimes, even single GPU systems have issues with new releases let alone multi-GPU setups. These reasons, along with the scale of the performance increase while using SLI, are why it is suggested to use high performance cards - if something goes wrong or a game doesn't scale well with SLI, you still have good performance.

Good point you made there DJ. It would be also a good idea to try to find out if the game can run with multi-GPU setups.

>Michael 
System1: CPU- Intel Core i7-5820K @ 4.4GHz, CPU Cooler- Noctua NH-D14, RAM- G.Skill Ripjaws 16GB Kit(4Gx4) DDR3 2133MHz, SSD/HDD- Samsung 850 EVO 250GB/Western Digital Caviar Black 1TB/Seagate Barracuada 3TB, GPU- 2x EVGA GTX980 Superclocked @1360/MHz1900MHz, Motherboard- Asus X99 Deluxe, Case- Custom Mac G5, PSU- EVGA P2-1000W, Soundcard- Realtek High Definition Audio, OS- Windows 10 Pro 64-Bit
Games: APB: Reloaded, Hours played: 3100+  System2: Late 2011 Macbook Pro 15inch   OFw63FY.png


#13 RainbowSix

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Posted 10 July 2011 - 08:49 AM

Most listed PSU requirements are recommended minimum. I'm running two Radeon HD 5770s on a 600W PSU and have had no slowdown whatsoever.
I suggest looking at this: http://www.tomshardware.com/reviews/asus-ares-radeon-hd-5870-crossfire-4gb,2685-13.html
and this: http://www.tomshardware.com/reviews/amd-enthusiast-crossfire,2421-14.html

Don't worry about the PSU. That is, unless your PSU is some no-name brand or has low efficiency.
In that case you should worry, a lot.

Edited by RainbowSix, 10 July 2011 - 08:55 AM.

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#14 killerx525

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Posted 10 July 2011 - 11:21 AM

Most listed PSU requirements are recommended minimum. I'm running two Radeon HD 5770s on a 600W PSU and have had no slowdown whatsoever.
I suggest looking at this: http://www.tomshardware.com/reviews/asus-ares-radeon-hd-5870-crossfire-4gb,2685-13.html
and this: http://www.tomshardware.com/reviews/amd-enthusiast-crossfire,2421-14.html

Don't worry about the PSU. That is, unless your PSU is some no-name brand or has low efficiency.
In that case you should worry, a lot.

Hmmm, if you can run 5770 in crossfire using a 600W PSU, that means i probably can run crossfire on my 5670 on 650W psu.

>Michael 
System1: CPU- Intel Core i7-5820K @ 4.4GHz, CPU Cooler- Noctua NH-D14, RAM- G.Skill Ripjaws 16GB Kit(4Gx4) DDR3 2133MHz, SSD/HDD- Samsung 850 EVO 250GB/Western Digital Caviar Black 1TB/Seagate Barracuada 3TB, GPU- 2x EVGA GTX980 Superclocked @1360/MHz1900MHz, Motherboard- Asus X99 Deluxe, Case- Custom Mac G5, PSU- EVGA P2-1000W, Soundcard- Realtek High Definition Audio, OS- Windows 10 Pro 64-Bit
Games: APB: Reloaded, Hours played: 3100+  System2: Late 2011 Macbook Pro 15inch   OFw63FY.png





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