Basically it's like this
Non-overclock: Buying a 600 horsepower car and keeping it at that.
Overclock: Buying a 600 horsepower car and tuning and pushing it to 650-700 horsepower. In some cases you can go from 600 horsepower to 1200 horsepower!
Your processor does so much per clockcycle. If you overclock it, you speed up the clockcycles. It's not really like increasing horsepower, it's more like increasing the maximum RPM's.
Anyhow, the difference between a 64bit and 32bit is different ram allocations. The max that a 32bit system can map is 4gb, including video ram and everything else. 64bit can map a massive amount of ram.
32-bit CPU can only support 32-bit operating systems. Ram maxes out at 4gb.
64-bit CPU can support 32-bit operating systems and 64-bit operating systems. The ceiling on ram is incredibly high. A 64-bit OS usually requires 64-bit hardware drivers to work properly.
32-bit CPU can only support 32-bit operating systems. Ram maxes out at 4gb.
64-bit CPU can support 32-bit operating systems and 64-bit operating systems. The ceiling on ram is incredibly high. A 64-bit OS usually requires 64-bit hardware drivers to work properly.
Itanium isn't exactly something mainstream. Either way, it's a bad platform. Last I heard, they will be no longer supported. Is it even a true x86 processor?