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My GPU doesn't display when its on PCIe x16 channels, even though they're working

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Nov 25, 2020
67 (0.68/day)
System Name ChinaVirus
Processor Intel Xeon E5 2620 v3 @ 2599.39 MHz
Motherboard Huananzhi X99-F8
Cooling Cooler Master MasterAir MA410P, Fans Corsair AF120
Memory 16Gb (2x8) Micron Technology 8192 MB (DDR4-2400) - P/N: 18ASF1G72PZ-2G3B1
Video Card(s) AMD Sapphire TOXIC R9 280X OC
Storage SSD NVMe 250Gb (KINGSTON SA2000M8250G); HD 1Tb (Seagate ST1000LM024 HN-M101MBB);SSD 1TB KingDian
Display(s) Samsung 7.2 inches (18.3 cm) / 1280 x 720 pixels @ 23-60 Hz
Case Mymax Full Tower Horus black
Audio Device(s) -
Power Supply Cougar Gx 800W 80Plus Gold
Mouse -
Keyboard -
Software Microsoft Windows 10 (10.0) Enterprise LTSB 64-bit
Benchmark Scores https://valid.x86.fr/k9amvl https://gpuscore.top/furmark/show.php?id=212229
I recently bought a Huananzhi x99-F8 motherboard and when I first used my R9 280x TOXIC in this mobo I was only able to run it on the 3rd PCIe slot (x4), the first and second slot (both x16) simply gave no video and a long beep meaning it was not able to detect the video card (the cpu doesn't have a integrated graphics card, it even displays the debug code 9C) After messing arround with the BIOS I was able to make all slots work but only on x8, when I change it to x16 the same error happens. I already tested all the channels with a low budget GPU, all slots worked even at x16. I really have no clue on what's going on since i tested this GPU (R9 280x TOXIC) on another mobo on the PCIe x16 and it worked fine, any idea on what I should do? Thanks in advance!


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Aug 1, 2020
656 (3.07/day)
System Name 1 Desktop/2 Laptops/1 Netbook
Processor AMD Athon X2 64/Intel Pentium 997/Intel Pentium 4/Intel Atom
Motherboard EpoX ATX motherboard/Samsung/Toshiba/Lenovo
Cooling Stock
Memory 4 GB/4 GB/2 GB/2 GB
Video Card(s) Asus GeForce GTX 780 Ti/Intel HD Graphics/GeForce 4MX/Intel GMA
Storage 6+ TB Total
Display(s) HP Pavilion 14 Inch 1024x768@60Hz 4:3 Aspect Ratio CRT Monitor
Case None
Audio Device(s) Various
Power Supply Seasonic 500 Watt & VenomRX 500 Watt
Mouse Wayes Iron Man Wireless Mouse
Keyboard Rexus VR2 Wireless Keyboard
Software Win10 & WinXP SP3
Benchmark Scores It sucks...
Try borrowing another GPU from someone else (your friends, parents, children, neighbors, dog, cat, etc.) & try it on your mobo if it has the same result. If it does, then the issue could be with the mobo. Also try updating the firmware of your mobo too. Might as well update your GPU's driver to ensure compatibility with your mobo.
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