It is possible. You would have to be EXTREMELY careful and know what you're doing, and have to have access to a chip that's 1gb worth since that's about the only size bigger you'll get on a single chip. Depends on how the Evo has it's ram setup, if it's setup single chip then method as I listed earlier. If it's dual chip, then 2 512 mb chips, etc etc. It's possible, but I wouldn't recommend it.