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The Radeon HD 7970 was a high-end graphics card by AMD, launched on December 22nd, 2011. Built on the 28 nm process, and based on the Tahiti graphics processor, in its Tahiti XT variant, the card supports DirectX 12. Even though it supports DirectX 12, the feature level is only 11_1.

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Fans spin, no display

I bought this GPU untested for $25. I haven't worked on GPUs before. When powered on, the fans spin up, the computer's lights turn on, but I get no display out. Where should I start/what should I do first?

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For $25 and a 11 year old card don't expect much. At least the fan spins so it is getting power. What you can do, to start, is test each of the ports using the appropiate cable:

DVI, HDMI and DisplayPort.

Any luck?


I wonder what signals one could expect on an oscilloscope when checking the ports. I f none of the outputs work I'd check around the GPU and the memory.

I can offer you the boardview schematic for your card so maybe you can check some of the components. https://drive.google.com/file/d/10mAbbxB...

You'll need something like the board viewer program from here http://boardviewer.net/ to view the fz file


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Hi @guardian10

Don't know Mac so the following is for a Windows PC and dependent on what resources you have available to use.

If you have a PC with a CPU that has integrated graphics, insert the GPU card and then check if the card is being detected in BIOS (if option is there) or in Device Manager.

If not there just verifying that you connected the power cable to the card?

If the CPU has no integrated graphics then connect a system speaker (example only) to the appropriate header pins on the motherboard (see mobo user manual for details) and check for any beep errors heard on startup e.g beep error code for no graphics adapter

If it is not being detected (or there is no appropriate beep error code heard) have you visually inspected the card (both sides) for any component damage? If it appears to be OK then you'll need to source the schematics to try and find out what's wrong. See Note below

If it is being detected, connect a monitor to each of the video output ports, one at a time to see if there is a video output on any one of them. If no good then you'll need to source the schematics to try and find out what's wrong. See Note below

Doing the above should at least let you know whether the problem is with the card "input" i.e. communication between the BIOS and the card is OK or not or the card "output".

You can also search online and find useful links like this which may also give you some ideas

Note: Be aware that there a several versions of the AMD Raedon HD7970 GPU card e.g. Asus, Gigabyte, Club3D just to name a few and there may be minor differences in the board layout, component values, circuitry etc to suit their requirements. The common factor is the GPU chip itself, so make sure that any info you find is relevant to the make of the card and not to the chip

Hopefully a start.

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