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Ram is almost useless when considering playback speeds. A dual core system can easilly play back 1080p even if it has less than 512 megabytes of ram. The main things that affect playback are CPU horsepower and the presence of GPU offloading (letting your video card decompress the video). With H.264, GPU offloading is scarce, primitive, and doesn't come into play often. That being said, you don't need alot of CPU power to decode H.264. My AMD athalon 2800+ (1.8 ghz) has no problems decoding 720p and, on occasion, can play back 1080p without lag.
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