Hero viii PCie is at x8 instead of x16 HELP

cchamberlain1384 · Dec 20, 2015

Ive built a new computer and when I checked some things ive found my card is at x8 instead of x16. The graphics card is in the correct location and I cant seen to figure this out.

Heres my pc:
http://pcpartpicker.com/p/4cv94D
Removed 1- 980ti

Also in bios under peg port config it shows

pciex16/x8_1 - x8 (greyed out cant change)

maxalge · Dec 20, 2015

cchamberlain1384 :

yes, if you have two cards they will run at 8x, 8x

Shaun o · Dec 20, 2015

It`s one of the things you have to watch and take note of.
When you buy a motherboard, based on the North and South bridge chip sets used.

For most by running two cards in sli mode each Pci-e based card slot will lower it`s self to X8 Pci-e lane speeds.

Unless the board you buy states that it can run at x16 Pci-e speed per Pci-e card slot on the motherboard.

There is nothing wrong. It is down to the limitations of the chip set used on the motherboard you have bought.

Here click on the link to the motherboard, and the detailed specs, look at the expansion slots information listing.

https://www.asus.com/uk/Motherboards/MAXIMUS-VIII-HERO/specifications/

cchamberlain1384 · Dec 20, 2015

My mistake I actually removed one card as It was running at x8 and x4 and I was getting worse performance. Removed the second and now getting x8 still

Shaun o · Dec 21, 2015

With one card in the first gray slot, and the other in the second gray slot.
Each card should run at x8 Pci-e lanes maximum.

2 x PCIe 3.0/2.0 x16 (x16 or dual x8, +gray)
1 x PCIe 3.0/2.0 x16 (x4 mode, +black)
3 x PCIe 3.0/2.0 x1

maxalge · Dec 21, 2015

Shaun o :

+1

You have a single x16 slot that runs at that speed when alone

you have another slot (grey) that will make both run 8x 8x ( this is what you want )

and a third slot that will make the first slot run at 8x, this third slot will run at 4x

Shaun o · Dec 21, 2015

Glad were both on the right track maxalge.

Phew.

I think he expected both cards to run at x16 each. But as you know the chip set on the mobo limits the amount of Pci-e lanes that can be allocated depending on the chip set used.

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Hero viii PCie is at x8 instead of x16 HELP

cchamberlain1384

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Shaun o

maxalge

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Shaun o

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cchamberlain1384

Reputable

Shaun o

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maxalge

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Shaun o

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