Applies to anything requiring Vram if you want to get so technical. Yes it does apply to higher res. Anything above 1920x1080p would be in the "higher res" catergory... 2560x1440 or 5760x1080p both are more demanding with many more pixels; therefore higher bandwidth is needed to keep up higher settings and mainly higher AA and not choke on minimum frame rate.
it's not like an nvidia card is going to choke to death at 1440p compared to an amd card.