都會玩到78.79卡了.電源上總不可能省太多錢去買350W吧
所以除非78跟79用電量需求相差100W.不然要讓78升級79卡的人.在特地去換個POWER.應該不可能

以下是麗台官方網站的需求電源W數:
7900GT
A minimum recommended 350W system power supply (with 12V current rating of 20A). For two GeForce 7900 GT-based graphics cards running in NVIDIA SLI configurations, a minimum 450W system power supply (with 12V rating of 26A) is recommended

7900GTX
A minimum recommended 350W system power supply (with 12V current rating of 22A)Note: For two GeForce 7900 GTX-based graphics cards running in NVIDIA SLI configurations, a minimum 500W system power supply (with 12V rating of 30A) is recommended.

有興趣的可以直接到麗台官方網站.點選您要看的顯示卡.下面就有電源W數需求:
http://www.leadtek.com.tw/cht/3d_gr...asp?seriesid=40

PS: 而要12V+有30A.便宜又大碗的就是X-PRO 450W 1800元一顆