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Other Graphics Cards and 3D Technologies Discussion forum for any graphics hardware not provided by AMD/ATI. Also place to discuss 3D technologies such as 3D Stereo, PhysX and other interesting developments/rumours in the 3D industry.

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Old Nov 27, 2015, 10:41 PM   #1
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Default First time with SLi

Alright, so just got a 65" LG 4k display. I really like how Witcher 3 looks at 4k, however, my 980 Ti just isn't up to snuff with everything maxed. I have an ASrock z87 MB that allows SLI. Thinking of getting a 2nd 980 Ti, however does it have to be the exact same card? For reference this is what I have now:

http://www.newegg.com/Product/Produc...82E16814125786

SLi bridge still needed? Also, what's this about 8x/16x lanes, and is there a performance difference?
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Old Nov 27, 2015, 10:51 PM   #2
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Does not need to be same exact 980Ti.

Yes, you still need a bridge.

It's ok if one is only in a x8 slot. Difference is negligible.

I will however suggest to get another reference model for SLI since they blow the heat out the rear of the case. Especially if there isn't at least 2 expansion slots between them.
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Old Nov 28, 2015, 06:57 AM   #3
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Quote:
Originally Posted by Meteor_of_War View Post
Does not need to be same exact 980Ti.

Yes, you still need a bridge.

It's ok if one is only in a x8 slot. Difference is negligible.

I will however suggest to get another reference model for SLI since they blow the heat out the rear of the case. Especially if there isn't at least 2 expansion slots between them.

^^^ what he said. Especially about the reference card. I had 2 GTX970s none reference and it got quite toasty. Switched to a single 980Ti reference (for now ;-) )
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Old Nov 28, 2015, 03:17 PM   #4
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reference cards or not top card is still going to be hotter than the other by 5c to 10c

if you have water or willing to put a rad in you could use this as your top card
http://www.newegg.com/Product/Produc...-997-_-Product
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Old Nov 28, 2015, 03:56 PM   #5
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Thanks for the info guys. Luckily I found the SLI bridge in the motherboard box. From the manual it's going to be an 8x/8x configuration in Pcie slots 2 and 4. Might be cutting it close with an 850watt power supply, but I can always upgrade if necessary.

I purchased this reference design:
http://www.amazon.com/gp/product/B00...ilpage_o00_s00

I'll definitely consider water cooling as an option going forward since I will be focusing on 4k gaming now, but I'll see how this setup works for now. I have a pretty big case (full tower, not midrange) with 12 fans and no extra addons other than basic SSD, MB, CPU, PSU and graphics card. I don't even have a CD drive, I just download from steam or stream from my office PC or USB stick.
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Old Nov 29, 2015, 08:43 AM   #6
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Whats your pci spacing like exposed, Sandwich or 1 slot breathing room?
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Old Nov 29, 2015, 09:32 AM   #7
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What are your specs?
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Old Nov 29, 2015, 10:16 AM   #8
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This is the motherboard layout (page11):
http://download.asrock.com/manual/Z87%20Extreme4.pdf

It looks like it will have some breathing space, but I suspect it will be a sandwich once both cards are placed.

Haswell i7 with 8GB PC 2400 memory.
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Old Nov 29, 2015, 11:47 AM   #9
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You will have space inbetween so you'll be alright, GPU1 will cover the PCIE3 and the, a 1" gap between PCI1 and PCIE4 which your second GPU will take up. You got nice airflow through the chassis though?

My TRI-SLI can get toasty but nothing I worry about. They are all reference so meh. My next upgrade will be either to a dual GPU variant or hybrid cooled GPU's.
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Old Nov 29, 2015, 05:21 PM   #10
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Got the 2nd card today. Installation was a breeze. Literally seat the card, snap on the sli bridge, and enable in the drivers.

Witcher 3 still isn't at 60fps @ 4k with everything maxed but I can live with it, since it's around 40-45fps most of the time. Dying Light looks great @ 4k also, performance between around 50 fps to 70.
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