Sapphire HD 7850 1 GB not detected by the system

Hi all,

I recently bought a Sapphire HD 7850 1GB graphics card but I can not get it to work. It looks like it's not recognized by the system. I can boot my PC fine with the screen connected to the GPU of the motherboard, but when I then look at devicemanger or MSINFO32 it looks like the system has not recognised anything but the GPU of the motherboard. There is no unknown device or HD 7850.

The 6-pin power cable (of a coolermaster 600 watt PSU) is connected and the fans are spinning. It is not the slot in itself because when I put my old graphics card (HD 5700) back in, it works fine.

I have also upgraded the bios to the newest version (0505) but to no avail. In the bios settings "PCI-E" is set as the primary graphics boot device.

My motherboard is a PN5-EM HDMI which has (I believe) a PCI express x 16 version 1.1 slot. There is a lot of conflicting information on this but I understand that for most cards (especially NVIDIA) they are all backwards compatible. But for the power-saving AMD cards for example I might experience compatibility issues.

What should I do?

8 answers Last reply
More about sapphire 7850 detected system
  1. try that gpu in others pc.

    pce exp 1.1 have no issues
  2. dude you have pci 1.0a not 1.1

    1.1 is fully compaitable with any pci 3.0gpu

    1.0 has issues with amd gpus while nvidia doesnot
  3. I don't really have another PC to test it in unfortunately but I will see what I can do.

    Can anyone confirm whether I have 1.1 or 1.0 on my motherboard? How can I check this?
  4. download gpu z and see
  5. I downloaded and ran it with my old graphics card in the PC.
    My PCI-E is 1.1
  6. well you have check that gpu in friends pc as to confirm that gpu is working!

    well it should work with your pc.
  7. I want back to the shop they tested it there and it worked fine.
    So I bought a new motherboard and now it works fine for me as well.

    Looks there was some incompatibility after all....
  8. hmm yes these pci exp issues have no complete final answer to it,sometimes works,sometimes doesnot.
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