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today I'll be using a synthetic Benchmark in this case 3D Mark 11 to

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evaluate something that I have received

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a lot of questions about over the years

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so what you may or may not notice is that I have changed my testbench I have

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gone with an Intel x58 platform for this

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particular test I'm using the Gigabyte G1 gorilla

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motherboard's get you guys better look at that G1 gorilla motherboard with an

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Intel Cor i7 960 so that is a quad core processor

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I've got that chip clocked at 4 GHz in

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order to reduce the any CPU bottlenecks

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that may occur in my test and now okay

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no do not always ask before opening this file so what I'm going to be looking at

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today is the effect of PCI Express bandwidth on SLI performance so you can

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see I have not used the top slot and there's a very good reason for that if I

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populate the top slot then it will run at 60x bandwidth and then if I populate

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the second slot I will have two cards running at 16x bandwidth if I populate

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these two slots I will have two cards

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running at here we are PCI e16 at adex

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bandwidth so I'm just going to switch to the other card and show you guys here so

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there you are at 8X bandwidth so that is

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what we're going to test I'm going to see what the 3D Mark score is running in

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these two slots versus these two slots so you guys can see how much of a

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difference there is in performance okay so for my first run through we got X

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3386 3386 3D marks in 3D Mark 11 so now let's

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run them at 60 next and see what kind of performance boost we get from giving

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them the full available bandwidth our two card configuration running the same

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test achieves

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3,389 3D marks so for

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comparison at 8X and 8x bandwidth we

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achieved 3,386 3D

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marks so we oh oh hold on hold on no no we should put in the other one

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3389 okay divided by

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3386 to find out the performance Improvement .1

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or rather that's a

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.01% performance Improvement by going from 60 uh 8X 8X to 16x 16x PCIe 2.0

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slots so um to anyone who wants to run

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SLI or Crossfire on the Intel p67

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platform I guess this means you're pretty safe from performance degradation

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even with high performance gpus like the GTX 580 thank you for checking out this

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little episode of Linus Tech tips don't forget to subscribe for more unboxings

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reviews and other computer videos