Processor upgrade help please :)?

I wanna upgrade my processor, my current one just isnt upto the task off gaming well, i mean i can run assassins creed, dragon age 2 etc etc... well, practically all games but not max settings which is what i want, anyways, the processor is a core 2 duo 6420 @2.13 ghz, the upgrade i want is thihttp://www.amazon.co.uk/Intel-Q8400-Core-Quad-Processor/dp/B00280YJIE/ref=sr_1_1?ie=UTF8%26amp;qid=1312674416%26amp;sr=8-1 basically, on the website i use, the processor i have atm is rated at a 3/10 and that one is a 7/10, ive yet to see a game require more than a 4 so i figure its a good investment, either way... my motherboard is a http://www.gigabyte.com/support-downloads/cpu-support-popup.aspx?pid=3512

Now, the website states that the processor is able to work with my motherboard, but my question is, is there anything else i will have to upgrade/change/rebuy by changing the processor?



other specs btw, ati radeon hd6770

550watt psu

4gb ram

windows 7



Truely, thank you to anyone who relplies, i really am a newbie when it comes to this stuff :PProcessor upgrade help please :)?
Power supply is good with the hardware you have and the addition of the new CPU, calculator says 440w, your covered. Did the same as you are doing a while back. Upgraded from a E8400 c2d to a Q9505 c2q. Dramatic difference. Also went to 8GB of memory. Overkill, but with the board I have it is 4GB or 8GB, only 2 slots for memory. Only item, and I think you checked this out, is if the board needs a BIOS update. This should be done if needed, before the new processor is installed. I keep my own updated on a continuous basis anyway. Gigabyte can help you with this if needed. You may want to upgrade now or later to a rifle type copper tube CPU cooler seeing your use of the computer in gaming. Does matter. They run a lot cooler. This system I run a $20 Rosewill cooler. Most of the time I see a average of 30C in temp. Link below. Hope it helps.