1. Can it run Far Cry 3 on High-Ultra?
2. Will the pc boot?
3. How long can i use this 7770 sapphire
1. A 7770 won't run high - ultra, more like mid - high but that depends on resolution.
2. It should. I'd definitely get a different power supply though as Cooler Master has developed a horrible reputation for false advertising.
3. At least a year or two before you Crossfire or upgrade but that can't really be done on H61. What is your budget? I might suggest going with an AMD A10 instead of that low end Pentium - far better CPU for not much money.