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-   -   PCIe 16x (https://forum.overclock3d.net/showthread.php?t=60558)

cuylar 26-02-14 04:55 PM

PCIe 16x
 
I'm in the process of of completing a $4,000 build and I need some advice.

I realize this is a motherboard question but it's directly related to the graphics cards.

I plan to be doing 1440p gaming with max settings and AA. I want my frame rates to be at least 120+. I've chosen the 780TI as my platform and I'll be doing SLI.

I think 2 cards at the moment will meet my needs.

My question relates to the PCIe slots.

Some boards like the Asus Rampage 4 Black can use 2 PCIe 3.0 slots at 16x... but other boards will only let you use one slot at 16x.... if you use 2 cards you will be limited to 8x.

How will the 16x in SLI vs the 8x in SLI matter to my frame rate?

Thank you in advance.

tinytomlogan 26-02-14 04:59 PM

Quote:

Originally Posted by cuylar (Post 733169)
I'm in the process of of completing a $4,000 build and I need some advice.

I realize this is a motherboard question but it's directly related to the graphics cards.

I plan to be doing 1440p gaming with max settings and AA. I want my frame rates to be at least 120+. I've chosen the 780TI as my platform and I'll be doing SLI.

I think 2 cards at the moment will meet my needs.

My question relates to the PCIe slots.

Some boards like the Asus Rampage 4 Black can use 2 PCIe 3.0 slots at 16x... but other boards will only let you use one slot at 16x.... if you use 2 cards you will be limited to 8x.

How will the 16x in SLI vs the 8x in SLI matter to my frame rate?

Thank you in advance.


I think the point here is 1440p - max settings 120FPS wont happen unless its crappy games - see the review below. So Id consider that before worrying about PCIE lanes.

http://www.overclock3d.net/reviews/g...d_sli_review/1

cuylar 26-02-14 07:44 PM

Quote:

Originally Posted by tinytomlogan (Post 733173)
I think the point here is 1440p - max settings 120FPS wont happen unless its crappy games - see the review below. So Id consider that before worrying about PCIE lanes.

http://www.overclock3d.net/reviews/g...d_sli_review/1

Yikes... I guess I've been focusing on maximum fps in other articles read.

Ok... well thank you.

Kaapstad 26-02-14 09:29 PM

Quote:

Originally Posted by cuylar (Post 733237)
Yikes... I guess I've been focusing on maximum fps in other articles read.

Ok... well thank you.

To answer your question using two cards on a RIVE BE @PCI-E 3.0 x16 compared to x8 gives very little difference in performance, less than 1%.

cuylar 26-02-14 10:49 PM

Quote:

Originally Posted by Kaapstad (Post 733274)
To answer your question using two cards on a RIVE BE @PCI-E 3.0 x16 compared to x8 gives very little difference in performance, less than 1%.

That must be a programming limitation though.... Or is it that the hardware isn't built to handle it?

Kaapstad 27-02-14 07:52 AM

Quote:

Originally Posted by cuylar (Post 733302)
That must be a programming limitation though.... Or is it that the hardware isn't built to handle it?

There is more than enough bandwidth on PCI-E 2.0 x16 or PCI-E 3.0 x8 to handle any of todays top end cards.


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