Ho rifatto la verifca per scrupolo la ATI Radeon HD 2600 XT monta 512 mb di ram così come da specifiche tecniche del sito ATI.

512MB GDDR3
Optimized for DirectX® 10 and Windows Vista™
CrossFire™ multi-GPU ready
ATI Avivo™ HD video & display technology
Hardware processed HD video acceleration (UVD)
Full HD 1080p video playback 1
Built-in HDMI2 for one-cable audio and video connectivity
5.1 (AC3) surround sound
HDCP ready for Blu-ray and HD DVD playback3
ATI Catalyst™ software suite