PC BOOTING ISSUE

[G_G90]

I've a pc with the following symptoms : 
1- sometimes the pc boots but without display , windows is booting normally but no display  and fixed by restart not from the first try every time but 90% of the time  at least 
2-  sometimes after the pc boots it lags , freeze and stutter  right away and then i get black screen sometimes the display comes back but still the same lag issues and sometimes not 
3-if the pc booted with display but it is heavily stuttering but without any freezes that i can at least run a benchmark I found the lag is caused by low GPU power draw so underload it should pull about 95w but when the pc is malfunctioning it fluctuates between 40~60 with some dips to the 30s or spikes to the 90s
GPU  statues are :
 GPU usage 100%
GPU  core clock 1875 
GPU  memory clock 6000mhz 
both gpu and cpu temps are in the 70s 
pcie +12v intput : 12.333v USING HWINFO 
6 pin #1 input voltage : 11.6 ~ 12.03 USING HWINFO
If it is running normally : 
all same expect for pcie +12v intput : 12.130 ~ 12.140 max
6 pin #1 input voltage : 11.680 ~ 11.730 max

5-if the pc ran fine on boot it stays like that for hours even under full GPU load 
6-  the pcie bus interface  is always x16 3.0 underload at 8.0 GT/s and without load its either x16 1.1 or x16 2.0 or x16 3.0 depending on what is happening on the pc "HWINFO " 

What did I try to fix it ?
1- reseated the GPU 
2- changed the 6pin connector of the GPU "my psu is not modular so I didn't change the cable I used  a different one as it has 2 6pins " 
3- reseated my CPU to make sure there is not bent pins just in case " in cpu benchmarks there is not issue that is ofc if the pc as a whole is running fine in the first place "
4- cleaned my GPU pins with in case there was any dust or oxidation on it  
5- blew the pcie socket on the motherboard with air 
THE ONLY THING THAT SEEMS TO FIX IT IS TO SET FORCE PCIE X8 FOR THE GPU FROM THE BIOS THERE WERE 3 OPSTIONS EITHER  SPLIT THE X16 TO X8\X8 OR X8\X4X4 OR AUTO WHICH MAKES IT RUN AT X16 
AT X8\X8 IT RUNS AT X2 
AT X8\X4\X4 IT RUNS AT X8 
PC :
Ryzen 5 1600AF 
ASUS PRIME B450M-A 
GTX 1650 SUPER PHOENIX OC 
2X8 DDR4 RAM 3200MHZ DUAL CHANNEL 
1TB WD BLUE 7200RPM HDD 
500GB GB  SATA SSD 2.5 INCH 
CASE : DEEPCOOL CC560 WTIH 4 LED FANS 
PSU : COUGAR VTC 500W 
"SRY FOR MY BAD ENGLISH "

[leclod]

Ideas : 

Update the bios

Reinstall Windows

How are the gpu temperatures ?

Try another gpu ?

Stay at stock settings: reset the bios, until problem solved 

Check the ram with testmem5 or memtest86

Edited December 5, 2025 by leclod

[Sawa Takahashi]

6 hours ago, G_G90 said:

6-  the pcie bus interface  is always x16 3.0 underload at 8.0 GT/s and without load its either x16 1.1 or x16 2.0 or x16 3.0 depending on what is happening on the pc "HWINFO " 

This is normal behavior. The PCIe interface drops in speeds to save on power or resources.

6 hours ago, G_G90 said:

THE ONLY THING THAT SEEMS TO FIX IT IS TO SET FORCE PCIE X8 FOR THE GPU FROM THE BIOS THERE WERE 3 OPSTIONS EITHER  SPLIT THE X16 TO X8\X8 OR X8\X4X4 OR AUTO WHICH MAKES IT RUN AT X16 

I think you got where to look. The PCIe interface supports x1 to x16 depending on how many connections are present. If x16 causes an issue but x8 runs perfectly fine, there is a problem in the connections or the connector inside the PCIe slot that are active only during the x16 operation. It may be a problem on the motherboard or on the graphics card or the connections themselves. And it can be really hard to identify.

What to do ? There are a few options.

1. I would say move the graphics card to another PCIe slot but since secondary slots will operate at x8 max, there is no point on doing that.
2. Set the primary PCIe slot at x8 (like you did) and leave things like that. Your graphics card will run perfectly fine on the x8 PCIe mode and I don't think you can measure a difference in performance. If you had a super processor with a super beefy GPU, maybe it would bottleneck at some point but with your current hardware, x8 is plenty of bandwidth.
3. Visually inspect the graphics card for irregularities on the contacts. About half the contacts, those located farther away from the video ports are those used exclusively in x16 mode. You can rub them gently with an eraser and make sure to remove any leftovers. If the issue does not originate from the contacts, I doubt it would be cost-efficient to go to a repair shop.
4. One test that may help determine if the graphics or the motherboard is at fault is to install your graphics card in another computer. If it works without issues, the motherboard is the culprit. If it misbehaves again, then the graphics card is faulty.

Hope my rambling is helpful

[OddOod]

3 hours ago, Sawa Takahashi said:

Set the primary PCIe slot at x8 (like you did) and leave things like that. You graphics card will run perfectly fine on the x8 PCIe mode and I don't think you can measure a difference in performance. If you had a super processor with a super beefy GPU, maybe it would bottleneck at some point but with your current hardware, x8 is plenty of bandwidth.

This is the answer. I run a 3080Ti on a gen3X8 slot and it's just as fast as it was on a gen4x16 slot. 
You're on an old platform and stuff is gonna start getting wonky. My guess is that the mobo is dying