Introduction
Clocked in at reference speeds, the cards beat out the reference design by having better cooling, but there's more to it than that. The Radeon HD 4870 Vapor-X versions ship with either 1GB or 2GB frame-buffer sizes - the latter a Sapphire-only product; no-one else retails the single-GPU card with such capacious memory.
Question is, does a 2GB frame-buffer on the single-GPU Radeon HD 4870 make any sense, or is it more marketing spin than anything else. Let's find out.