drwho wrote:Are you sure the IGP is disabled ? in some intel cpus , the video decode block is separate from the main graphics , also even if vp9 is isn't directly supported, if vp8 is , then it may be partially hardware accelerated..
The i5-3470 IGP was completely disabled. It wasn't even showing up in Device Manager.
The i7-4930K is an LGA2011 CPU and doesn't even have an IGP. In GPU-Z, the GTX 970's video decoder was showing 0% utilization while playing VP9.