Well I recently purchased a refurbished 27 inch 2011 imac with the 3.1ghz processor. It is replacing my 2008 2.4ghz intel core 2 duo mac. I have several questions: 1) Can i use the 21 inch as an external display for my new 27 inch? 2) If so, what cable should i use? 3) If i have 2 external displays hooked up, how much more taxing will it be on my computer? For example, If i am gaming with my 21 inch imac hooked up, with the game on the 27" and the web open on the 21", should i expect slower performance? 4) Is it possible to use external displays when using W7 over boot camp? 5) I splurged on the extra 4gb of ddr3 1333mhz ram as it was only $40.00, how big will the performance difference be with 8gbs instead of 4gbs? Where will i notice the difference most? 6) Do thunderbolt external SSDs exist? If so, would they be as fast as an internal SSD? 7) Is there an adapter that will let me display my xbox 360 on my 27 inch imac? If there is that is great because then i can get rid of my 27 inch viewsonic. I know it is alot, thanks to anyone who can answer these!