HEVC playback video memory usage

[skogs]

I'm having problems deciding between a 2gb and 4gb RX550 for a htpc. Will the extra memory do anything for video playback? Or will 2gb be plenty for 50mbps++ 4K HEVC?

I've tried doing the research, but haven't found much on hevc memory usage.

 

[Gundark]

Look up at the spec of smart TVs and smart phones. With only 1GB ram they run it like a breeze. My TV start to choke a little at around 100mbps so you should be good at 2Gb. Oh, I forgot, I played HEVC 4K videos with HD7870 just fine ( OFC not hardware accelerated ).