i5 vs i7

Is there any noticable difference in performance/power consumption between the i5 and i7? I wish to get a new processor for our desktop, and want to know which is better.

Some things to note is
-It will be only on Windows 7 (if there are any compatability issues)
-Will be playing some fairly new games like ACB/AC2/Lord of the Rings Conquest
-Will use CS5.5 like Photoshop and Dreamweaver

You might want to have a looky here pal

Difference between i3, i5 and i7 processors?

Core i5 vs. Core i7: What's the Difference?

The i7 is stronger than the i5. The i7 has hyperthreading, while the I5 does not.

The real question is whether you have an additional $100 or not. The i7 is stronger and faster, but may not be worth $100 extra. Both are fast processors and I've got friends who own both and they love them both.