triple crossfire advice

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dedlight

dedlight

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Dec 26, 2012
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im running i4700k with the asus maximus extreme vi mobo, tri-crossfire his 7970 1200 watt psu and 16gig of 1866mhz memory. With a 2560x1600 res crossoever moniter. Just wonder if theres anything i need to do in the bios. Amd ccc is recognizing them, but it dont seem to be getting performance i think it should. and advice would be nice.
 
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JackNaylorPE


The 4770k is an i7 not an i5

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131974

PCI Express 3.0 x16: 5(x16 or dual x8 or x8/x16/x8 or x8/x16/x8/x8)...
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HEXiT

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Mar 13, 2011
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waste of time on that platform. if your gonna use more than 2 gfx cards you need an i7 2011 platform with a 6 core processor and a motherboard that has around 40 pci-e lanes. 16x16x8 the i7 4770k is 1150 socket so is bound to 16 pci-e lanes handled by the cpu which means in tri fire your cards will be reduced to 8x4x4 compromising the performance to the point you get very little performance gains from the 3rd card... in some cases as low as 7% over 2 cards. so like i say. if your gonna go tri fire you need to jump to the 2011 platform.
 
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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The 4770k is an i7 not an i5

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131974

PCI Express 3.0 x16: 5(x16 or dual x8 or x8/x16/x8 or x8/x16/x8/x8)

http://www.guru3d.com/articles_pages/asus_maximus_extreme_vi_z87_review,1.html

To get you four Gen 3.0 links, ASUS had to apply a trick, that was adding a PLX PCI-Express 3.0 switch IC, responsible for the oh-so many slots. Two of the slots can operate in x8 (3.0) mode, three and four at 8x, and the black one at 4x
Click to expand...

As to the OP, it's long been recommended not to go past 2 cards in CF by most reviewers..... but the recent hoopla regarding CF has brought several issues to light.... the 13.8 beta drivers have resulted in some improvements but CF is still a ways away from being fixed ... have you applied the 13.8 drivers ?
 
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HEXiT

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Mar 13, 2011
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its an i5 in all but name... the 4770k cpu is limited to 16 pci-e lanes that can be shared. to get the pci-e lane combos the motherboard is boasting it must be using a shared pci-e bridge, which means its not truly x8x8x8.
if it was the cpu would need 24 or more pci-e lanes, but it doesnt have them.. the socket 2011 handles the pci-e off cpu and because of this has much more scope for the amount of pci-e lanes available to it. some boards having 48 pci-e lanes or more. meaning true x16 support across 3 slots without any added latencies.

pci-e 3 is the socket standard it has nothing to do with the amount of lanes it can handle. thats decided on the northbridge or cpu depending on platform.
it doesnt matter what that motherboard has on it now because the pci-e is handled on the cpu. its pure marketing gimmickry that introduces a lot of latency to the system in order for it to work.
 
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thebunnyrules

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Oct 13, 2015
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HEXiT said:
> pci-e 3 is the socket standard it has nothing to do with
> the amount of lanes it can handle. thats decided on the
> northbridge or cpu depending on platform.

As far as I know there aren't any z87 or LGA1150 CPUs that have more than 16 lanes, yet the Maximus is a z87 platform and is claiming to be able to support up to 8x16x8x8x4 (a total 44 lanes) because of the bundled PLX chip that supposed to add some extra PCIe lanes. So what are you saying? Are the ASUS specs false or does the z87+PLX chip combo not work as well as a 40 laned CPU?
 
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