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Will GTX 680 SLI performance suffer if running in PCI-E 2.0 8x slots?

Last response: in Graphics & Displays
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August 17, 2013 1:08:38 AM

I was exploring the possibility of purchasing a GTX Titan or 780 and selling my GTX 680. I run a single monitor, an ASUS PB278, 2560x1440 at 85 MHz. Some games stutter even with the GTX 680 in the computer. I only wish to play games the way the good lord intended they be played, with every setting maxed out.

I currently have an EVGA GTX 680 Signature Superclocked card in my computer, sitting in a Gigabyte Z68X-UD4 board with 16 GB of RAM and powered by a 1000 watt Platinum rated PSU.

While looking at resale prices of the GTX 680 on ebay i decided to take a quick peak at Newegg and saw the ASUS GTX 680 Direct CU card selling for only $330 after rebate and started thinking about SLI.

Now here come the actual questions:
1) will my motherboards PCI-E 2.0 8x slots be a bottleneck for these puppies in SLI? When using 1 GPU the slot runs at 16x, when using SLI the slots clock down to 8x each.
2) IS GTX 680 SLI worth the extra 150 watts of power over the 780?
3) Yes, I have tried google. but if you can point me to related professional reviews I will be grateful. when i say related, i mean something that shows PCI 2.0 8x vs 16x.


PS: Please don't mention AMD cards. I hate them. they have given me nothing but headaches. I don't care what benchmarks numbers are like.

More about : gtx 680 sli performance suffer running pci slots

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August 17, 2013 1:46:41 AM

For 1/4 price you get a bit better than a Titan sli'ing 680's.

Use this to meddle with;

http://www.anandtech.com/bench/product/766?vs=764

As for selling the 680, what you're willing to spend on a Titan, i would think about selling the 680 and buying twin 770's. Titan is best, but for the price, a single 780 would be better. If sli, twin 770s but for 300 bucks, you couldn't go wrong with another 680.

8x is fine for dual setup for todays cards.

Radeon: http://www.youtube.com/watch?v=rSfifE2Domo

Nvidia: http://www.youtube.com/watch?v=NFMzRZqFh-w

Demos above regarding 16x vs 8x is outdated slightly but still significant compared to whats available now.
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August 17, 2013 5:36:18 PM

boju said:
As for selling the 680, what you're willing to spend on a Titan, i would think about selling the 680 and buying twin 770's. Titan is best, but for the price, a single 780 would be better. If sli, twin 770s but for 300 bucks, you couldn't go wrong with another 680.


I don't know what i was thinking, the Titan was a dumb idea. I thought about twin 770s, but they cost $410 + a pop and burn a good amount more power (25 watts per card) than GTX 680s with marginal performance gains. totally not worth it if you already have a GTX 680 that is factory OCed.

After watching the 8x vs 16x video you posted and others i found this morning, I ended up getting that second GTX 680 (Asus Direct CU). after all the coupons, rebates, etc, the price is going to be $320. They'll have to do.

thanks
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