PCIE X16 used at only X1

[shakoga23]

Hello!

 

Recently i built a new pc and as per i am facing tons of new problems. At first i faced problem with 4.0 slot for GPU which is giving me black display on monitor and i cant use GPU for full potential, then i changed the lost and moved it to 3.0 slot but i recently discovered that even though my motherboard supports x16 bandwidth, it only works on x1. as described on picture below: Could you please tell me what could have caused this issue? 

 

my pc specs

MOBO - ASUS Prime B660M-A D4

GPU- 6700 XT Gigabyte

PSU - 650 W EVGA 80+Gold

RAM- 8GB pair of Corsair

CPU- i5 12400F

[-rascal-]

53 minutes ago, shakoga23 said:

Hello!

 

Recently i built a new pc and as per i am facing tons of new problems. At first i faced problem with 4.0 slot for GPU which is giving me black display on monitor and i cant use GPU for full potential, then i changed the lost and moved it to 3.0 slot but i recently discovered that even though my motherboard supports x16 bandwidth, it only works on x1. as described on picture below: Could you please tell me what could have caused this issue? 

 

my pc specs

MOBO - ASUS Prime B660M-A D4

GPU- 6700 XT Gigabyte

PSU - 650 W EVGA 80+Gold

RAM- 8GB pair of Corsair

CPU- i5 12400F

 

You SHOULD be using the top PCI-E X16 slot.

The PCI-E lanes are coming from the CPU for that top slot.

If that slot is not working properly, you need to fix that, or find out what is wrong (CPU or motherboard) and get it fixed or replaced.

If this is a new PC, then you SHOULD get any faulty parts replaced.

 

The remaining bottom black-coloured slots DO NOT run at full speed.

They are PHYSICALLY X16, but only ELECTRICALLY X4 and X1.

 

If the graphics card is idling on the Desktop, then it is seen to be at @ X1, rather than full speed.

 

Make sure you are plugging the monitor into the back of the graphics card, and NOT to the back of the motherboard.

[shakoga23]

11 hours ago, -rascal- said:

 

You SHOULD be using the top PCI-E X16 slot.

The PCI-E lanes are coming from the CPU for that top slot.

If that slot is not working properly, you need to fix that, or find out what is wrong (CPU or motherboard) and get it fixed or replaced.

If this is a new PC, then you SHOULD get any faulty parts replaced.

 

The remaining bottom black-coloured slots DO NOT run at full speed.

They are PHYSICALLY X16, but only ELECTRICALLY X4 and X1.

 

If the graphics card is idling on the Desktop, then it is seen to be at @ X1, rather than full speed.

 

Make sure you are plugging the monitor into the back of the graphics card, and NOT to the back of the motherboard.

I can't use top slot because its not giving me any display, thats why i moved to 3.0 slot.When i tried to put GPU in to 4.0 slot it gave me 1 long>3 short beeps > pause> and 1 short beep. I dont know what could cause the problem

[Tan3l6]

As mentionsed before - the GPU-Z reports x1 bandwith when there's no load on GPU. 

Fire up Furmark and watch if it changes.

[shakoga23]

2 hours ago, Tan3l6 said:

As mentionsed before - the GPU-Z reports x1 bandwith when there's no load on GPU. 

Fire up Furmark and watch if it changes.

how long should test keep going?

[shakoga23]

2 hours ago, Tan3l6 said:

As mentionsed before - the GPU-Z reports x1 bandwith when there's no load on GPU. 

Fire up Furmark and watch if it changes.

https://gpuscore.top/furmark/show.php?id=740458

 

 

[Tan3l6]

38 minutes ago, shakoga23 said:

how long should test keep going?

I meant just watch GPUz window when Furmark is running - it should report instead of x1 the actual x16.

[Shg23]

2 hours ago, Tan3l6 said:

I meant just watch GPUz window when Furmark is running - it should report instead of x1 the actual x16.

Hi! I am commenting from different account now, it did not report anything like that and did not showed up bus speed. only showed this final score

[-rascal-]

6 hours ago, Shg23 said:

Hi! I am commenting from different account now, it did not report anything like that and did not showed up bus speed. only showed this final score

 

He is telling you to look at CPU-Z

The 'Bus Interface' info should change when the GPU is under load.

So, if you are using PCI-E 3.0 slots (which is PCI-E 3.0 @ 4x max), it should show "@ x4 3.0" when you have Furmark running.

 

 

1-long, 3-short beeps = "video card not detected, or bad video card"

Again, if the top PCI-E slot is not working, then something is probably PHYSICALLY faulty.

Either the PCI-E X16 lanes are not connecting between the CPU and motherboard, or the PCI-E X16 slot on the motherboard is damaged, etc.

Since your PC is *NEW* get that fixed, rather than just "move it down to another slot."

 

The 16 PCI-E lanes connected to the top PCI-E X16 slot is coming from the CPU.

The bottom 2 slots are coming from the B660 motherboard chipset.

 

It's like buying a BRAND NEW 12 speed mountain bike.

6 of the speeds are not working.

You don't just say...I'll just not use the broken 6 speeds.

NO, you get the bike fixed / replaced.

[Shg23]

9 minutes ago, -rascal- said:

 

He is telling you to look at CPU-Z

The 'Bus Interface' info should change when the GPU is under load.

So, if you are using PCI-E 3.0 slots (which is PCI-E 3.0 @ 4x max), it should show "@ x4 3.0" when you have Furmark running.

 

 

1-long, 3-short beeps = "video card not detected, or bad video card"

Again, if the top PCI-E slot is not working, then something is probably PHYSICALLY faulty.

Either the PCI-E X16 lanes are not connecting between the CPU and motherboard, or the PCI-E X16 slot on the motherboard is damaged, etc.

Since your PC is *NEW* get that fixed, rather than just "move it down to another slot."

 

The 16 PCI-E lanes connected to the top PCI-E X16 slot is coming from the CPU.

The bottom 2 slots are coming from the B660 motherboard chipset.

 

It's like buying a BRAND NEW 12 speed mountain bike.

6 of the speeds are not working.

You don't just say...I'll just not use the broken 6 speeds.

NO, you get the bike fixed / replaced.

Thanks for detailed explanation, while benchmarking i checked it and realised that it was not changing and was the same speed.

 

Regarding second part, recently i discovered that there are 2 pins bent in mobo socket, could it cause the failure of 4.0 slot not working and also i want to know should i test mobo without standoffs just on desk, cause i am not sure about whether contacts are good or not.

[-rascal-]

36 minutes ago, Shg23 said:

Thanks for detailed explanation, while benchmarking i checked it and realised that it was not changing and was the same speed.

 

Regarding second part, recently i discovered that there are 2 pins bent in mobo socket, could it cause the failure of 4.0 slot not working and also i want to know should i test mobo without standoffs just on desk, cause i am not sure about whether contacts are good or not.

 

YES.

Those bent pins COULD likely be important pin(s) that affects the PCI-E X16 slot.

 

You can also test on top of a desk (i.e. motherboard sitting on top of the motherboard cardboard box).

 

But the 2 bent pins is VERY suspect.

[Shg23]

9 hours ago, -rascal- said:

 

YES.

Those bent pins COULD likely be important pin(s) that affects the PCI-E X16 slot.

 

You can also test on top of a desk (i.e. motherboard sitting on top of the motherboard cardboard box).

 

But the 2 bent pins is VERY suspect.

Thank you for clarifying, will try to fix the bent pins and one more thing i wanted to know is it possible that CPU will work normally even with bent pins? because i suspect CPU should have some problems if pins are bent, but apart from Slot and Bus Speed of GPU i have not suspected any problems

[Shg23]

9 hours ago, -rascal- said:

 

YES.

Those bent pins COULD likely be important pin(s) that affects the PCI-E X16 slot.

 

You can also test on top of a desk (i.e. motherboard sitting on top of the motherboard cardboard box).

 

But the 2 bent pins is VERY suspect.

And one more thing, what tool should i get to see bent pins on cpu, something like a microscope?

[-rascal-]

8 hours ago, Shg23 said:

Thank you for clarifying, will try to fix the bent pins and one more thing i wanted to know is it possible that CPU will work normally even with bent pins? because i suspect CPU should have some problems if pins are bent, but apart from Slot and Bus Speed of GPU i have not suspected any problems

The CPU is most likely fine.

On the bottom of the CPU is flat gold contact pads.

When you put the CPU down into the socket, and lock it in, the pads touch the little pins in the socket.

 

It depends on which of the...1700 pins are bent / broken.

One sign of problems of bent pins...is what you are seeing now. PCI-E X16 slot not working.

There are reports of memory slots not working, M.2 SSD slot(s) not working.... and in some cases the CPU is not being recognized, etc.

 

8 hours ago, Shg23 said:

And one more thing, what tool should i get to see bent pins on cpu, something like a microscope?

 

It is no bent pins on the CPU.

It is bent pins on the motherboard.

You should be able to just see the bent pins by eye.

The pins could be shorter than the others, or facing the wrong direction, etc.

 

Example...

Spoiler

 

Fixing the bent pin is another problem.

If it just bent out of shape, you could try fixing it by straightening it out with a sewing needle + microscope / magnifying glass.

However, if the pins have BROKEN off, or bent way too out of shape, there is no way to repair it yourself.

At that point, unless you bring it to repair shop... they even might not be able to fix it ...

The other only option is to get the entire motherboard replaced.

 

[Shg23]

16 hours ago, -rascal- said:

The CPU is most likely fine.

On the bottom of the CPU is flat gold contact pads.

When you put the CPU down into the socket, and lock it in, the pads touch the little pins in the socket.

 

It depends on which of the...1700 pins are bent / broken.

One sign of problems of bent pins...is what you are seeing now. PCI-E X16 slot not working.

There are reports of memory slots not working, M.2 SSD slot(s) not working.... and in some cases the CPU is not being recognized, etc.

 

 

It is no bent pins on the CPU.

It is bent pins on the motherboard.

You should be able to just see the bent pins by eye.

The pins could be shorter than the others, or facing the wrong direction, etc.

 

Example...

  Reveal hidden contents

 

Fixing the bent pin is another problem.

If it just bent out of shape, you could try fixing it by straightening it out with a sewing needle + microscope / magnifying glass.

However, if the pins have BROKEN off, or bent way too out of shape, there is no way to repair it yourself.

At that point, unless you bring it to repair shop... they even might not be able to fix it ...

The other only option is to get the entire motherboard replaced.

 

Hi! I took mobo to local specialist and he sort of fixed it but still not getting display on 4.0 port. One more thing that happened was that M2 SSD was not detected on slot near CPU but was detected at different slot, then we removed CPU cleaned it and put it back, then M2 was detected and it start working, could this give us any little hint what might be the problem?

[-rascal-]

9 hours ago, Shg23 said:

Hi! I took mobo to local specialist and he sort of fixed it but still not getting display on 4.0 port. One more thing that happened was that M2 SSD was not detected on slot near CPU but was detected at different slot, then we removed CPU cleaned it and put it back, then M2 was detected and it start working, could this give us any little hint what might be the problem?

 

Both top PCI-E X16 slot AND top M.2 slot is coming from the CPU.

The bottom PCI-E X16 slots AND bottom M.2 slots are coming from the motherboard.

 

What do you mean "sort of fixed it"?

 

Did he show you what pins were damaged / bent in the motherboard socket?

 

CAN HE TEST IF YOUR CPU IS 100% WORKING IN ANOTHER MOTHERBOARD?

You need to find out what is bad. The CPU OR Motherboard (or both).

[shakoga23]

12 hours ago, -rascal- said:

 

Both top PCI-E X16 slot AND top M.2 slot is coming from the CPU.

The bottom PCI-E X16 slots AND bottom M.2 slots are coming from the motherboard.

 

What do you mean "sort of fixed it"?

 

Did he show you what pins were damaged / bent in the motherboard socket?

 

CAN HE TEST IF YOUR CPU IS 100% WORKING IN ANOTHER MOTHERBOARD?

You need to find out what is bad. The CPU OR Motherboard (or both).

Well about sort of fixed- i can not see any bent pins anymore on mobo and its almost ideal however it was my last hope as problem causing nearest PCIE slot to not work but since its already been fixed problem still occurs. Unfortunately this person does not have a compatible CPU and neither MOBO to test each my components so basically i am at the same place i were before.

[shakoga23]

12 hours ago, -rascal- said:

 

Both top PCI-E X16 slot AND top M.2 slot is coming from the CPU.

The bottom PCI-E X16 slots AND bottom M.2 slots are coming from the motherboard.

 

What do you mean "sort of fixed it"?

 

Did he show you what pins were damaged / bent in the motherboard socket?

 

CAN HE TEST IF YOUR CPU IS 100% WORKING IN ANOTHER MOTHERBOARD?

You need to find out what is bad. The CPU OR Motherboard (or both).

Forgot to mention it was actually me who showed him the bent pins.

[-rascal-]

On 10/15/2022 at 1:42 AM, shakoga23 said:

Well about sort of fixed- i can not see any bent pins anymore on mobo and its almost ideal however it was my last hope as problem causing nearest PCIE slot to not work but since its already been fixed problem still occurs. Unfortunately this person does not have a compatible CPU and neither MOBO to test each my components so basically i am at the same place i were before.

 

On 10/15/2022 at 1:42 AM, shakoga23 said:

Forgot to mention it was actually me who showed him the bent pins.

 

Bent pins on the motherboard socket is tricky, especially with the LGA type.

He may have straightened out the bent pins, but if it's still not touching the gold contact pad on the bottom side of the CPU, it is still no good.

 

Can you take a photo of the motherboard socket?

 

You'll have to either borrow another motherboard, or buy another one to test...

At this point, we've basically narrowed it down to CPU or Motherboard.

[Shg23]

On 10/18/2022 at 1:17 AM, -rascal- said:

 

 

Bent pins on the motherboard socket is tricky, especially with the LGA type.

He may have straightened out the bent pins, but if it's still not touching the gold contact pad on the bottom side of the CPU, it is still no good.

 

Can you take a photo of the motherboard socket?

 

You'll have to either borrow another motherboard, or buy another one to test...

At this point, we've basically narrowed it down to CPU or Motherboard.

Sorry for the late update, recently i found specialist in my home town who checked PCIE x16 slot with microscope and found out the resistors were little bit damaged, possible because of physical damage, he fixed it and now it works super well! 

 

P.s. before when the problem occured my mobo could not detect third pcie slot wich was actually 4.0 slot and now it has been detected and works fantastic. right now looking for a new thermal paste and cooler to install it in case. 

 

Thanks everyone for suggestions and help!