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Based on our record, CasparCG seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I would definitely give it a try because it won't cost you anything apart from time testing (link here) - it allows fullscreen outputs straight from the GPU - however since you need exactly 8 outputs you might want a simple PCIe output card just for the last output, so you at least have one display going to a monitor somewhere to actually be able to use the PC - unless you want to remote into it via command line... Source: about 2 years ago
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