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How graphics are escalated compared to PCI-Express?

How graphics are escalated compared to PCI-Express?

November 16, 2014 3:10 am0 comments

We showcase this interesting article in TechPowerUp, in which they have proven firsthand the scaling ratio of graphics cards in relation to the type of PCI-Express port to which we connect it. In this case, they test the performance impact on a NVIDIA GeForce GTX 980 in an Intel Haswell environment, with PCI-Express sockets that electrically operate at x16, x8 and x4, plus of course PCI-Express 1.0, 2.0 and 3.0.

To make this article possible, they used the special feature of the BIOS of Asus ROG Maximus VI Hero, which allow the electrical change in functioning of the PCI-Express sockets, and can select 1.0, 2.0 and 3.0. Also, using a plastic insulating adhesive, they could modify the lines available on the graphics card, isolating those that they did not want to use.


The first test was with the new title Alien: Isolation, where in a resolution of 1920 x 1080 (Full HD) you can see a good difference in performance between using one mode or another, but it is noteworthy that more FPS were obtained using the PCI-Express 3.0 x8 socket, rather than the same for x16. Very interesting.

Alien Isolation

In a game optimized for NVIDIA graphics such as the title Assassins Creed IV: Black Flag, the performance difference was almost negligible, getting only 4 FPS of difference between using a GTX 980 in a PCI-Express 1.1 x 4 sockets and a PCI-Express 3.0 x16.

Assassin's creed 4

You can find the full article in TechPowerUp, but the verdict is almost obvious: in most games, there is no significant performance jump between using different PCI-Express sockets, not even across generations. It seems that either the graphics still do not have enough power to take advantage of the high bandwidth provided by the new PCI-Express generation, or increasing bandwidth does not really have much to do when it comes to games.

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