GPU Future Proofing PCIE Slots potential to run them ?

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accessgamer

accessgamer

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Dec 26, 2013
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Hi All,
Greetings !!

I have a GTX 770 DUAL SuperClocked 4GB 256-bit GDDR5 PCI Express 3.0 Card installed on my MSI-GD65 with 1050 WATTS PSU.

Mobo supports (3 x PCI Express 3.0 x16 slots (x16 or x8/x8 or x8/x4/x4)

Is spending extra 300$ or so on another 770 4GB and doing an SLI set-up worth as future proofing ?


Because the SLI setup for 2 cards will bring or run in PCIe at 8x/8x

So the question is 770 4GB at PCIe 3.0 16x vs 2 770 4GB's at PCIe 3.0 8x / 8x

Which is good ??

Also I play on 1080P Monitor or sometimes on Projector.

Is the current existing card 770 4GB already overkill for the displays ?

I play all high end games like BF4 , TITAN FALL etc

Please suggest ??
 
Solution
Eximo
You are thinking about this incorrectly. PCIe lanes just represent a fixed amount of bandwidth. GPUs don't use all of it or they would always be bottlenecked.

GTX770 at 16x will still only use the bandwidth it can output and receive. Two GTX770s even with less lanes will still use the same amount of bandwidth. PCIe 3.0 at 8x is still a lot more bandwidth then pretty much all but dual GPUs need.

You could run two GTX780Ti off of PCIe 3.0 8x lanes and not see an issue. Or R9-290X and their 512bit memory bus, again, no problems.
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Eximo

Eximo

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For 1080p you should already have good performance.

8x/8x at PCIe 3.0 is still a lot of bandwidth, there will be no performance loss from doing an SLI configuration.

If you were to purchase a 2560x1440 monitor with a high refresh rate it might be useful.
 
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accessgamer

accessgamer

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Dec 26, 2013
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Thank you for the reply.
But technically
770 4GB at PCIe 3.0 16x vs 2 770 4GB's at PCIe 3.0 8x / 8x

What will happen , single card runs at full potential @ 16x speed , 2 card are supressing to run@8x so in both scenarios the performance will be same right ? if so then it is waste to spend for SLI based on my MOBO right ?
 
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Eximo

Eximo

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You are thinking about this incorrectly. PCIe lanes just represent a fixed amount of bandwidth. GPUs don't use all of it or they would always be bottlenecked.

GTX770 at 16x will still only use the bandwidth it can output and receive. Two GTX770s even with less lanes will still use the same amount of bandwidth. PCIe 3.0 at 8x is still a lot more bandwidth then pretty much all but dual GPUs need.

You could run two GTX780Ti off of PCIe 3.0 8x lanes and not see an issue. Or R9-290X and their 512bit memory bus, again, no problems.
 
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Solution
accessgamer

accessgamer

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Dec 26, 2013
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Thank you for educating.
Got the concepts more correctly.
 
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