Like CBB said, there's no "yes or no" answer.
Try it.
5x5 will definately improve your strength. I've gone off it lately to a 4x10 on alot of stuff and noticed I've lost some strength. If you subscribe to the "with strength comes size school" then it should work for you.
Of course as CBB mentioned too, no food, no mass. Minimum, bare minimum of 2 g of protien per lb of body weight. That protien with a good balance of carbs and fat should do it.
Lots of factors there though.