how is crossfire affected with more lanes straight from CPU PCH latency microstutter

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WINTERLORD

WINTERLORD

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i was wondering on the upcomming coffe lake and on threadripper platforms and maybe some current skylake x platforms.

was wondering say coffe lake i believe will have 24 lanes straight to the cpu as opposed to 16lanes. was wondering on these platforms with more pcie lanes that i assume go straight to the cpu bypassing the chipset with these new features will it make crossfire and sli setups more viable? cut out microstutter and latency? with having more thyen 16+ lanes would that make a dual graphics card settup just as good as a monster card like the 1080 ti or vega 64?

could we get a review looking into the question? also if anyone has some thoughts or experience would much like to hear
 
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Sakkura
Crossfire isn't "as good as a single card", it needs to be better since you're paying for two (or more) cards instead of one. And in terms of raw power, it is better. It's just that game and driver support is never going to be as good as it is with a single card. That drawback has nothing to do with the PCIe connection, though.

Coffee Lake offers 24 PCIe 3.0 lanes directly from the CPU, but that's nothing special. For example, a Core i7-4960X from 2013 offers 40 PCIe 3.0 lanes directly from the CPU. Those are not going through the chipset.
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Sakkura

Sakkura

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Aug 22, 2011
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No, it won't make any difference. We've had Intel platforms with 40 PCIe lanes straight from the CPU over the past years, and it doesn't help SLI/Crossfire at all. A PCIe 3.0 x8 connection is more than plenty.

Also 24 lanes still means each GPU will be limited to PCIe 3.0 x8, as you can't run an x12 link. It's powers of 2 only.
 
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WINTERLORD

WINTERLORD

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ok but since those lanes are direct even at 16x and 8x since they dont go through the chipset im assuming then wouldnt crossfire be juist as good as a single card? on a platform with high number of lanes from cpu? coffe lake i think supports 24 lanes without use of chipset
 
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Sakkura

Sakkura

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Aug 22, 2011
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Crossfire isn't "as good as a single card", it needs to be better since you're paying for two (or more) cards instead of one. And in terms of raw power, it is better. It's just that game and driver support is never going to be as good as it is with a single card. That drawback has nothing to do with the PCIe connection, though.

Coffee Lake offers 24 PCIe 3.0 lanes directly from the CPU, but that's nothing special. For example, a Core i7-4960X from 2013 offers 40 PCIe 3.0 lanes directly from the CPU. Those are not going through the chipset.
 
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