PCIE bandwidth droped to 8x from 16x

[Sohaib Yousafi]

Hi all.

Help will be appreciated . and Thanks in advance.

My current system:

- Intel core i7 2600k @ 3.4Ghz (never Overclocked)
- MSI Z68A-GD65 (P8 Bios now)
-GIGABYTE GV-N770OC-2GD (recenlty upgraded)

My problem:

As i have recenly upgrade to gtx 770 from MSi GTX 560ti Hawk(560ti was working on pcie 2 @x16 ,N1 motherboard bios) .
At first my gtx770 didnt work with MSI z68A gd65 on N1 Bios . So i upgraded my Motherboard Bios to latest P8 (without any reading my bad 🙁 .)
So now i am in kind of problem .My card is in x16 slot of mobo but only working on x8 (detailed under GPU z) . any suggestion how can i make my gpu work on x16 . Please ^_^. Consider me a noob xD

 

[siddharthmukul007]

that is because you pci-e works as 2 where as the gtx770 is pci-e 3.

pci-e 2.0 x16=pci-e 3.0 x8 (pci-e 3.0 has double the bandwidth of pci-e 2.0)

the only way you can get it to work as 3.0 is if you upgrade the processor to 3rd or 4th gen.

i am sure you not not having any bottleneck as such

 

[smorizio]

power off the pc and drain power from the wall for safety. look in the video slot for bent pin or dirt. take a soft paper towel and some rubbing alcohol and clean the gold contacts to see if there finger oil or dirt or them. let the card dry them plug it back in. rerun the tests with the newest nvidia drivers installed. if the 8x issues still there in the bios see if your mb has options for the pci vidoe bus speed. if it set to auto try setting it to 2.0 mode and see if that changes anything. also check to see if there a card in one of the pci slots. some slots are wired together so yu may have to move a wifi or sound card.

 

[Amdlova]

the vga drops 8x because power. only works full pci 16x when it using. my card do this. don't worry its normal.

 

[Sohaib Yousafi]

but my 770 is working on pcie 2 @ x8 . not on pcie 3 @x8 .
in addition i thought 770 is fully pcie 2 supported ? please correct me .

+ i cleared cmos of my Mb . come on guys i really dont want to buy new MB please .
will pcie 2 @ x8 Bottleneck my 770 with 2600k ???

 

[bignastyid]

In GPU-Z click the ? next to the bus interface(where its showing 8x), read the information then start the render test.

 

[siddharthmukul007]

yes it is 2.0 supported

are you using the 1st pci-e x16 slot???

make sure you do not have any other card on any other pci-e slot, or else the speed is shared between them you you will end up getting only x8

 

[Sohaib Yousafi]

Full story . bandwidth dropped only after bios upgrade .
only single 770 atm MB bios P8.
my previous card 560 ti was working on x16 on first slot. bios v N1.

and i have check full render test . it only change my gen from 1.1 to 2 🙁 . no change in bandwidth.

 

[bignastyid]

Is anything plugged into the 2nd pci-e 16x port?

 

[Sohaib Yousafi]

nothing 🙁 in second slot .

 

[siddharthmukul007]

put the gpu in the 1st x16 slot and see

 

[Sohaib Yousafi]

already in first x16 slot .
i have checked in both slot .
card is working on x8 in both slots .
with only one difference.
1st slot 770 @ x8 on x16 based slot
2nd slot 770 @x8 on x8 based slot

 

[Sohaib Yousafi]

another thing i forgot to tell , after bios upgrade my old 560 ti is not giving display in first pcie x16 slot.

 

[Robert Ostrowski]

have you ever considered gpuz is making the mistake? have you run any benchmarks to see what your graphics are doing?

 

[Sohaib Yousafi]

have you ever considered gpuz is making the mistake? have you run any benchmarks to see what your graphics are doing?

yes heaven and 3d mark fire strike (something xD ) . But i am just not satisfied . just tell me that there is no difference between pcie 2 x8 and pcie 2 x16 in case of gtx 770 .not even 1% .