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Windows 7: PCI-e 3.0 GPU + MoBo + Ivy CPU = PCI-e 2.0 ???


04 Dec 2012   #1

Microsoft Windows 7 Ultimate 64-bit Service Pack 1
 
 
PCI-e 3.0 GPU + MoBo + Ivy CPU = PCI-e 2.0 ???

Hello,

I have Asrock Z77 Extreme4 Mobo + i3 3220 Ivy bridge CPU. I've just added a Sapphire HD 7850 to this and I was expecting it to run @PCI-e x16 v3.0.

But GPU-z reports it's working @x16 v2.0

How can I fix that?



My System SpecsSystem Spec
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04 Dec 2012   #2

Windows 7 Pro X64 SP1
 
 

There's a BIOS setting for the PCI-E link speed. According to your manual (p. 62 of the downloadable English version, under north bridge configuration), its default setting is Auto. You could try manually setting it to Gen 3 compatibility, in whatever fashion Asrock defines it.
My System SpecsSystem Spec
04 Dec 2012   #3

Windows 8.1 Pro RTM x64
 
 

That is perfectly normal. When your computer is not doing anything strenuous, the speed of the graphics interface drops (in my case to 1.1) because there isn't any demand graphically. However, when running a graphically intensive/demanding program, the speed will jump up to the maximum for the bus (in my case, this is 3.0). An example of a program that does this is Unigine Heaven 3.0, and if you have GPU-Z open whilst you run Heaven (you will need to change the resolution to 640x480 and deselect the Full Screen option), you will see the value change.

This feature works in much the same way as Cool'n'Quiet and SpeedStep does for AMD and Intel CPUs respectively.
My System SpecsSystem Spec
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04 Dec 2012   #4

Windows 7 Professional 64 bit
 
 

I have the same motherboard, but an Nvidia GPU. I didn't alter any settings after installing the motherboard and GPUz reports mine as being PCI-E 3.0

I will have a quick look in my bios to see how things are set.


Edit, scratch that, yes what Dwarf said, mine see my screenshot.


Paul.


Attached Images
 
My System SpecsSystem Spec
04 Dec 2012   #5

Microsoft Windows 7 Ultimate 64-bit Service Pack 1
 
 

I've already set it to Gen3. No difference. There is also this:

When I open the Catalyst control center hardware tab. It also shows that Maximum Bus Setting is PCI Express 2.0 x16

Is this normal for 7850 ?

My System SpecsSystem Spec
04 Dec 2012   #6

Microsoft Windows 7 Ultimate 64-bit Service Pack 1
 
 

GPU-Z shows @x16 1.1 when idle. Steps up to x16 2.0 when running GPU-Z render test.
My System SpecsSystem Spec
04 Dec 2012   #7

Windows 7 Professional 64 bit
 
 

Did you do what Dwarf said regarding running a program such as heaven and looking at GPUz while its running?
My System SpecsSystem Spec
04 Dec 2012   #8

Microsoft Windows 7 Ultimate 64-bit Service Pack 1
 
 

Quote   Quote: Originally Posted by paulpicks21 View Post
Did you do what Dwarf said regarding running a program such as heaven and looking at GPUz while its running?
Downloading Heaven now. GPU-Z render test stepped it up to v2.0 only

I'm also bugged that Catalysts shows the card's Maximum Bus Setting as "PCI Express 2.0 x16"
My System SpecsSystem Spec
04 Dec 2012   #9

Windows 7 Professional 64 bit
 
 

See how it goes with Heaven, but essentially you have a PCI-e 3.0 card and a PCI-e 3.0 Motherboard so at worst its just some kind of setting wrong.
My System SpecsSystem Spec
04 Dec 2012   #10

Microsoft Windows 7 Ultimate 64-bit Service Pack 1
 
 

Quote   Quote: Originally Posted by paulpicks21 View Post
See how it goes with Heaven, but essentially you have a PCI-e 3.0 card and a PCI-e 3.0 Motherboard so at worst its just some kind of setting wrong.
Yes but that affects performance. I think My 3DMark'11 scores should be higher than this with i3 3220 Ivy CPU and HD 7850 ?

SCORE P4977 3DMarks

GRAPHICS SCORE 5217
PHYSICS SCORE 4394
COMBINED SCORE 4350

Will post result with Heaven soon...
My System SpecsSystem Spec
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 PCI-e 3.0 GPU + MoBo + Ivy CPU = PCI-e 2.0 ???




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