asrock z77 extreme6 pci-e problem?

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Kiballer

Honorable
Jun 9, 2013
18
0
10,510
Hi, I thought it had two 3.0 pci-e x16 slots?

I use second pci-e slot with single card, but it indicates as 2.0 x 8

Is this normal?
 
Solution
Madn3ss795


That's the problem. Here's your board's spec : http://www.asrock.com/mb/Intel/Z77%20Extreme6/?cat=Specifications

2 x PCI Express 3.0 x16 slots (PCIE2/PCIE4: single at x16 (PCIE2) / x8 (PCIE4) or dual at x8/x8 mode)
Click to expand...

Since you only has a single 6950 in 2nd pci-e x16 slot ( PCIE4 ), it will run at x8 only. And since hd6950 only supports pci-e 2.0 standard, it will run at 2.0 x8. Moving the card to PCIE2 slot will make it run at 2.0 x16.
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K

Kiballer

Honorable
Jun 9, 2013
18
0
10,510


It is Sapphire HD6950 2GB Dual fan, only 1 card on second lane.
I used GPU-Z.

I tested with 3DMark11, and first lane's score was higher than 2nd lane.
 
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Madn3ss795

Madn3ss795

Dignified
Mar 19, 2013
2,715
0
13,960


That's the problem. Here's your board's spec : http://www.asrock.com/mb/Intel/Z77%20Extreme6/?cat=Specifications

2 x PCI Express 3.0 x16 slots (PCIE2/PCIE4: single at x16 (PCIE2) / x8 (PCIE4) or dual at x8/x8 mode)
Click to expand...

Since you only has a single 6950 in 2nd pci-e x16 slot ( PCIE4 ), it will run at x8 only. And since hd6950 only supports pci-e 2.0 standard, it will run at 2.0 x8. Moving the card to PCIE2 slot will make it run at 2.0 x16.
 
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