I want to upgrade the graphics card on my HP Z400. For now I'm using a GTX 750ti with no issues but I'd like to upgrade to a GTX 1080. I purchased a SilverStone 600W PSU but after connecting it to the mother board I just get 4 red beeps coming from the case. After some digging it seems like I don't really have any options as the z400 does not support 3rd party PSU's. What are my options? I need to upgrade my GPU, I need at least a 500w PSU with 2 8pin connections.
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