Yes, you have a bottleneck - CPU too slow for GTX 460.
Yes, you'll have to reformat your drives in order to set Hardware Raid.
You can set Software RAID with lower performance, but you'll be able to keep a partition intact.

 

Will that bottle neck be huge proformance dip.

 

Depends on the game engine, but many games will not be able to reach 60fps with all the effects turned on with that CPU.
As for RAID0, the fact the two hard drives are so different is going to detriment performance. That combined with the overhead would make the RAID0 a PITA for little to no IO performance gain. I would say completely not worth it, esp if your goal is for gaming.

 

Quote:

Originally Posted by liljoey112;14438214
Will that bottle neck be huge proformance dip.

Yes, the 460 is a very capable GPU, and the Phenom I is old architecture and low clock (2.3Ghz), so getting a cheap AM3 mobo + Athlon II x3 or x4 can go as far as double your FPS.

 

What is your motherboard? It may be able to simply take on an AM3 CPU. You can upgrade to a decent AMD x3 for as low as $60 and x4 for as low as $90.