We installed the RTM (release to manufacturing) Vista Ultimate code on desktop and notebook systems of varying specs and ages, and then we ran a series of benchmarks to answer several key questions about Vista's impact on performance. Our main findings:

• Vista is generally slower than XP, but it's better at multitasking on dual-core PCs.
• Your PC should have 1GB of RAM at the bare minimum.
• Aero won't slow you down if you use a discrete graphics processor and enough memory.
• Apps run slower on the 64-bit version of Vista, but adding RAM closes the gap.

Our conclusions here aren't the last word on Vista performance, however: When we conducted our tests in November, graphics companies were still fine-tuning their drivers (for example, we decided to drop our Doom 3 gaming tests because ATI's drivers didn't yet support that game's OpenGL graphics API).