Hello, soon I am buying myself a new computer and I want to know which cpu is better
(here where I live they cost the same (10$ dif).
The graphics card I want to take is ATi 5850.
the mother board is Gigabyte GA-P55-UD3
You can't run an AMD Phenom II on a P55 board.
That should make your decision easier. Your only options on a 1156 board are the i5 range and the i7-860 (from memory). The socket is different for different ranges of processor.
For new stuff at the moment:
AM3 - AMD Phenom II etc
775 (P35/P45) - Intel Core2Duo / Core2Quad
1156 (P55/X38/X48) - Intel i5 and i7 860
1366 (X58)- Intel i7 9xx models
You can probably get those CPUs cheaper online as generally on etailers the 945 is like $30 cheaper than the i5 750. Anyway P55 boards are of course more expensive than a good AM3 board, so it just depends on your budget. If you can afford to go with the i5 and P55 setup without straining your budget then go for it.