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

Last response: in Graphics & Displays
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December 4, 2012 5:56:36 AM

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?

a b U Graphics card
December 4, 2012 6:26:45 AM

try changing the PCI-E slot, if it worked, reset your bios.
a c 109 U Graphics card
a c 186 à CPUs
December 4, 2012 6:28:30 AM

Not that it matters.
Related resources
December 4, 2012 7:11:33 AM

Simu said:
try changing the PCI-E slot, if it worked, reset your bios.



I tried changing slots already. No luck. Also, my other slot is a x8 one. Only the current slot is x16 v3.0 . But the card is working @x16 v2.0

a b U Graphics card
a b à CPUs
December 4, 2012 7:11:34 AM

In one of BIOS updates they added:
v2.20 9/21/2012
1. Add Gen2 and Gen3 speed option in PCIE Link Speed setup items.
2. Auto detects PCIE link speed.

Maybe try changing it manually to PCIE 3.0 in BIOS.
December 4, 2012 7:12:12 AM

amuffin said:
Not that it matters.




I'm aware that there shouldn't be any big difference between pci-e v2.0 and v3.0 for a single 7850. But still this might indicate another problem and I'd like to see it fixed.
December 4, 2012 7:45:49 AM

Bejusek said:
In one of BIOS updates they added:
v2.20 9/21/2012
1. Add Gen2 and Gen3 speed option in PCIE Link Speed setup items.
2. Auto detects PCIE link speed.

Maybe try changing it manually to PCIE 3.0 in BIOS.



Hmm I may need a BIOS update. I'll try this. Thank you :hello: 
December 4, 2012 3:20:05 PM

kenjori said:
Hmm I may need a BIOS update. I'll try this. Thank you :hello: 



BIOS update didn't change anything :( 

Any other ideas?
a b U Graphics card
a b à CPUs
December 4, 2012 3:32:31 PM

Get a copy of GPU-Z and run that. PCIe allows the graphics card to clock down to a lower bus speed to save power when the highest speed is not needed. However, GPU-Z (as opposed to CPU-Z) has a graphics test that it runs in a window to force the PCIe bus speed to run at max speed.

i.e. my system has a Radeon HD 7970 installed but when it is running on the windows desktop it only runs at PCIe x16 @ 1.0. However, when I run the GPU-Z graphics test, it steps up to PCIe X16 @ 2.0. (I don't have a PCIe 3.0 motherboard)
a c 87 U Graphics card
a b à CPUs
December 4, 2012 3:34:44 PM

you could click on that small question mark in gpu-z next to the bus readout, it'll start a small render test to kick it out off power saving states. (modern cards tend to lower the interface speed as well to save power)

edit: lol i'm so slow, but it seems i actually read the posts :p 
a b U Graphics card
a b à CPUs
December 4, 2012 3:53:43 PM

That's right. It says PCIE 3.0x16 @x16 2.0. Mine says the same thing.
December 4, 2012 5:52:34 PM

JKatwyopc said:
Get a copy of GPU-Z and run that. PCIe allows the graphics card to clock down to a lower bus speed to save power when the highest speed is not needed. However, GPU-Z (as opposed to CPU-Z) has a graphics test that it runs in a window to force the PCIe bus speed to run at max speed.

i.e. my system has a Radeon HD 7970 installed but when it is running on the windows desktop it only runs at PCIe x16 @ 1.0. However, when I run the GPU-Z graphics test, it steps up to PCIe X16 @ 2.0. (I don't have a PCIe 3.0 motherboard)


I'm alredy running GPU-Z ??

And it's showing @x16 1.1 when idle. It steps up to x16 v2.0 when running the render test.
December 4, 2012 5:56:37 PM

There is also another thing. 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 ?


a c 109 U Graphics card
a c 186 à CPUs
December 4, 2012 10:19:06 PM

Remember, ivybridge core I3 doesn't have 3.0.
!