GTX660 in a PCIe @ 8x help!

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hnbdgr

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Jul 17, 2013
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Hi,

My mobo is ASUS P8P67 PRO (LGA1155) rev B3. I recently swapped my gtx460 for a well priced gtx660 (Asus GeForce GTX 660 DirectCU II OC). I didn't count with the new card being bigger and I can't fit it in PCIe slot 1 where i kept my old one.

So I've put the GTX660 in slot 2,

Slot Type PCI-E
Slot Usage In Use
Bus Width 32 bit
Slot Designation PCIEX16_2
Slot Number 4

nvidiainspector screenshot:

https://dl.dropboxusercontent.com/u/14123055/gtx660.jpg

So Asus claim the port is capable of running at 16x single or 8x SLI.

check under expansion slots:
http://www.asus.com/Motherboards/P8P67_PRO/#specifications

but inspector show it as running @8x

Does this indicate there wil be a performance hit? I've heard even the high end cards don't make use of the 16x bus?? On the other hand I had 2 people tell me that it will be running at half it's full performance...? Really would appreciate your help here as it's confusing the hell out of me...

Many thanks

Mike

EDIT: grammar

 
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ingtar33

ingtar33

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Dec 17, 2012
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a 660 is a nice gpu but not fast enough to bottleneck on a pci-e 2.0 x8 slot. even a titan wouldn't bottleneck more then 7%-9% on it.

you actually have 3 pci-e 2.0 x16 slots on that mb. the top two share bandwidth with each other, and i suspect the mb defaults to x8 when you plug into the 2nd one, the 3rd one is the black slot... which shares bandwidth with the other pci card slots... if you don't have any other cards plugged in, it should be a x16 slot too. you can try your card there if it bothers you.
 
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H

hnbdgr

Honorable
Jul 17, 2013
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thanks ingtar33, asus states:

2 x PCIe 2.0 x16 (x16 or dual x8) *1
1 x PCIe 2.0 x16 (x4 mode, black) *1
2 x PCIe 2.0 x1
2 x PCI

so the black one runs at x4 mode and is unsuitable for graphics, on top of that its right at the wall of my case so no way i can fit the gpu there...

I don't have anything in the complimentary small PCI next to my white slot where my gpu is so that the shared bandwith isnt an issue.

Thanks, you reassured me a bit but I will look into getting a bigger case....
 
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Mahisse

Mahisse

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Nov 26, 2012
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The GTX 660 is probably where the limit is for cards that won't loose "significantly" performance in a x8 slot. Cards higher than that will probably get some kind of noticeable perfomance decrease but may not be noticeable besides in benchmarking or if running dual monitors. You can download GPU-Z and see what speed your card is running. I would agree with ingtar33 that it should be running x16 if there's nothing in the first slot.
 
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H

hnbdgr

Honorable
Jul 17, 2013
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10,510
thanks but it doesn't fit thats the problem. at the same time I think I'll be happy running it in the 2slot for some time and when I get a new case I might get a new mobo and cpu as well....
 
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