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SLI card picking help!

Last response: in Systems
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April 23, 2013 10:52:50 AM

Helloo!
I currently have an M-Atx build whit these specs :
Intel i5-3550 (3.6Ghz)
Zotac GTX 670 (refrence)
Maximus 5 Gene
Corsair SSD 120gb
Kingston Hyper X 8Gb
WD 1tb HDD
Corsair 600w psu
NZXT Vulcan

Well to start whit i would like to buy another 670 to my build, and i need help picking which one. When i bought the system i didn't buy 2 cards at once because too tight budget. Now I have saved up enough for another card.
At first i was sure that i would buy another one alike as my old one ( so that i have two identical) but now while searching for another i find the ASUS 670 (direct cu2 thingy) as a pretty good choice, since the fan would be quieter.

The reason I've been thinking about not buying another blower is because of the the noise.
If i end up buying the ASUS one i think i would put it in bottom and the zotac on top, and run the monitor of the ASUS one ( making it the primary one whit the most workload), well i need your help if that setup is even possible, since every one i know has the top card as the main card ( is it possible to have the bottom as main card?)
The reason i would like to have the ASUS at the bottom is that i think it can handle the heat better than the Zotac in a tight jam.

Oh and will my CPU bottleneck my GPU's to badly?

Any help is appreciated (:
-Darox

More about : sli card picking

April 23, 2013 11:21:29 AM

A few points:

-What resolution do you play at? I decided to get SLI 670s, but for the most part it is overkill for 1080p.
-You may need to get a bigger PSU for ease of mind. 600w is a little low for twin 670s
-how much room will you have between cards if you do SLI, and how good is the airflow in your case? I ask because a card with a non reference cooler such as the Asus one exhausts into the case instead of out the back. Can your case cooling handle that?
-since you've already got one blower type cooled 670, it would probably be wise to just get a second. No point in getting a quieter 2nd card if the 1st one is the noisy one anyways. Might as well have 2 noisy ones. Besides, if you run vsync the cards will not be taxed as much and hence will be cooler and quieter.
-ensure whatever 670 you get, it has the same amount of RAM
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April 23, 2013 11:23:50 AM

The primary card is set by the mainboard and in most systems that would be the first PCI-E slot. Although some boards have a different slot if you are just running a single card. So even if you plug your monitor into the bottom card that will not change.

For best compatibility I would get the same make/model to ensure that they both work together in SLI.

Are you running one monitor? Really a single GTX 670 can handle most any game on a single monitor with no problems. How ever if the cards are scaling correctly they both will be used to render the display and will not really make much difference where they are placed. I know that my SLI GTX 670's seem to scale a little better than my AMD/ATI Crossfire rigs. That is in games that do not really need SLI/Crossfire I find that the Nvidia cards will both be used at like %35-%40 percent where as on the Crossfire rigs one card will be doing most of the work and the other will be hardly used. The end result is the same it is just how they are utilized.

So in the end it will not really matter where they are placed they are both going to do half of the work or close to it. If the Asus is going to run cooler I would put it in the Top anyway because that way the first card would have less restriction and be able to pull in more are by not being blocked by another card.
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April 23, 2013 11:27:35 AM

The primary card is set by the mainboard and in most systems that would be the first PCI-E slot. Although some boards have a different slot if you are just running a single card. So even if you plug your monitor into the bottom card that will not change.

For best compatibility I would get the same make/model to ensure that they both work together in SLI.

Are you running one monitor? Really a single GTX 670 can handle most any game on a single monitor with no problems. How ever if the cards are scaling correctly they both will be used to render the display and will not really make much difference where they are placed. I know that my SLI GTX 670's seem to scale a little better than my AMD/ATI Crossfire rigs. That is in games that do not really need SLI/Crossfire I find that the Nvidia cards will both be used at like %35-%40 percent where as on the Crossfire rigs one card will be doing most of the work and the other will be hardly used. The end result is the same it is just how they are utilized.

So in the end it will not really matter where they are placed they are both going to do half of the work or close to it. If the Asus is going to run cooler I would put it in the Top anyway because that way the first card would have less restriction and be able to pull in more are by not being blocked by another card.

The only reason I am even running SLI on my GTX 670's is because I run Surround on 3 Asus 27" monitors. And even at that I have some games that I run at 5760x1080 that do not use both cards at 100% but a single card is not quite enough. Just be sure that the second card has the same amount of ram as the first.
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April 23, 2013 11:37:12 AM

Thank you for the answers!
I currently only have one Full HD monitor, and for me it's good enough ( i would not even probly have room for another one on my table).
Yes i'm aware of the fact that i would need to buy another PSU, but thanks for pointing that out. I think my case can handle the airflow of two cards.

Still i would like to hear what you other think,
Zotac Gtx 670 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
OR
Asus gtx 670 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Sofar we have atlease one who thinks the Zotac would be a better friend for my exising Zotac.
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April 23, 2013 12:53:59 PM

Go with the Zotac. You'll save 50 bucks and won't spend extra money on a quieter card that won't make a difference in your situation.
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!