There isn't really a GPU to powerful for a CPU. The fact is one of them will be a bottleneck in games. Having a bottleneck isn't an issue as there is always a bottleneck its just when that bottleneck keeps frame rates to low do you have an issue. It appears you want to build a well balanced system that doesn't waste money. Assuming your playing games I would step up to a core I5-2400 as a dual core CPU depending on the games could very well be a major bottleneck. With that said the i3-3220 will do fine on many games so if its not in your budget this is not a bad setup.
I think what he was trying to get at was a situation like having a GTX 680 with paired with a really low end CPU. In that case the GPU would be "to powerful" for the CPU. For the poster's case though you are compleatly fine the I3 despite being a dual core is pretty powerful CPU.
power supply 450W LC-Power LC6450 V2.2
Hard Disk 3,5 1000GB Seagate ST1000DM005
ASUS DRW-24B5ST Retail black
Case Miditower 430W Techsolo Oversea MO-04
for a total of 639€
do you think it's ok? isn't the GPU too powerful for the CPU i'm using?
edit - i am really looking to play the upcoming simcity and the multiplayer component of bf3 . so can i3 handle bf3 at ultra or should i go for core i5 3450 and hd 7850 or the non ti version gtx 660 whenever it comes out ?
I have the ASRock Extreme4 Z77 as well; it's loaded with features that are great for overclocking. The price difference between a 2400 and a 3570k isn't that large. If you're gonna take that step to i5 id go with a 3570k, it's a very powerful proc for the price you pay and it's unlocked so you can overclock it when its performance becomes inadequate someday. Right now the 3570k is on sale for $209.99 at ncix.com. Also, as lilotimz has said, the power supply is a very weak point in your build. They come on sale all the time for decent prices, get a 600w PSU to give yourself some space for upgrading and capacitor aging. And please buy a brand name PSU
450 Watt is perfectly fine for that build. That 450 Watt is awful though.
There is absolutely no point in getting a 750 or 800 watt power supply in this situation. If you plan on triple-crossfire or something in the future then go ahead.
28nm gpus and 22nm cpus don't use that much power. I would say under full load you're probably only using at most 300 watts with that build.
You do always want some head room so your PSU doesn't have to overwork itself so always make sure to buy a more powerful PSU than you theoretically need.
I recommend a high quality 400+ watt PSU with good amperage on the 12V rail(s). The brands mentioned above are great.
Besides that I'd keep your build the way it is. It is well balanced. I don't think you need an i5.
What if he upgrades later on? Say in during the upcoming year? Price difference for a higher wattage PSU is a much lower cost than buying the 450W only to buy a higher wattage later down the road no?
I mean he's already entertaining the possibility of upgrading his CPU/Motherboard to an i5 in this thread alone. I always get a higher wattage PSU than I need because should I decide to add more components or higher end components I am covered.
Also a higher wattage PSU with a lower load on it will heat up less and last longer since it will only be using a tiny fraction of available power. This means that a higher Wattage PSU will follow along for a long time as you upgrade every other component of the PC.