Actually, I have had bad luck with rendering 1080p 60fps videos under 20,000,000 bps, making some areas look grainy, even before upload. So I have the max it can go on the codec Sony AVC/AAC in SVP 13, which is somewhere around 24,000,000 bps. I render that and it looks fine, then upload and the quality is slightly degraded. Either way, YouTube even recommends 1080p video creators with fast internet speeds to render in 50,000 kbps, which is 50,000,000 bits. If one does not have that satisfactory of internet speed, they recommend 8,000 kbps, which is what you mention. Sure the 50,000 kbps will be re-encoded down to 8,000 but the quality does make a difference.