Will my other components bottleneck GeForce GTX 560 Ti 448?

You will be fine but if you upgrade to an i5 3570k the performance would be better

i dont know to much a bought intel chips but i had to overclock my AMD althlon x3 440 from 3.00 to 3.60 to be able to keep up with my gtx 550ti.....mabie that will give u and idea and abought your motherboard supporting...if u have a gtx 550 ti installed now u will be able to upgrade to a 560 with no problems

With respect to what applications will you be gauging the bottleneck ? You need to have a specific application in mind, like a certain game, or GPU accelerated application.

The extremes I can think of in games goes from StarCraft 2 (CPU intensive, so GPU being fast doesn't help) to Skyrim with a lot of mods and 1080P or above resolutions (not CPU intensive, but very GPU-VRAM intensive, so CPU doesn't limit game FPS). Or something like CUDA enabled encoding applications where the CPU is essentially doing very little, so the faster the GPU, the faster the encoding (and more $$$ goes to Nvidia).

The i3 will not "bottleneck" the gtx 560 ti 448 on most games other than battlefield 3 and starcraft 2. You'd be in gtx 670/680 territory long before you will see the i3 2100 significantly bottlenecking modern games.

I play games like Crysis, Assasins Creed, Skyrim etc. so the I3 should keep up with the GTX 560 Ti 448.

What about my motherboard, should i upgrade or will it do just fine?

Thanks for the answers

Your motherboard is fine. These days, the PCI-E and Memory Controllers are onboard on the CPU, so it makes very little difference to switch motherboards. You usually get a different motherboard to get abilities such as Over Clocking, Multi-GPU support, Dual LAN, more memory slots, etc...

Since you have a i3, the motherboard you have will be just fine. If you ever decide to upgrade, and get a more overclockable CPU, then you might want to consider a Z77 based motherboard. For now, YOU ARE FINE.

Okay, that's what i thought too, but thanks!

You are very welcome!