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Only one GPU is working on my HD 5970

Question asked by drambit on Jan 4, 2020

I have an ATI Radeon HD 5970 Dual GPU Video card. For some reason, when I play games with it, only one GPU does anything while the other GPU sits idle at 0% usage. Even in Project Cars 2, which apparently has excellent Crossfire support, my second GPU sits completely idle at 0% while the main GPU is in the high 90s. 


Both GPUs are detected in GPU-Z and device manager. Crossfire is enabled according to GPU-Z. UCLS is turned off. I'm not receiving any errors. I have the latest AMD drivers. I have no idea why only one GPU is doing anything and I need help finding out why.