ebay
If you have a compatible motherboard then this will work. But I highly doubt it will be compatible. the problem with replacing the core 2 duo with the newer i5 is the size and pin difference, the core 2 duo is simply smaller than the i5, you would have to buy a new mother board, which in most cases it would be cheaper to just buy a new laptop with the i5 or i7 in it.
If you buy a retail boxed processor, yes. You do get a heatsink fan (HSF) with the processor.
Description
the difference between i5-6xx (Dual Core) and the i5-7xx (Quad Core) is that the Dual Cores have a integrated GPU clocked at about 733MHz, however the Quad Cores are extremely fast and the i5-760 can even outrun some of the i7s! also the dual cores have half the L3 Cache as the Quads. Unless u really do not want to buy a GPU i would go for a i5 Quad as the i5-750 is only £8 more expensive than the cheapest Dual.
what is i5
Intel core i5 is used in desktops and laptops while mobile i5 is used in netbooks, the mobile i5 is not as powerful as the regular i5 because it is built for mobile devices.
The best computer to buy among the three is i7. It will be able to complete the calculations faster.
Should I buy a Intel core i5-4670k quad-core desktop processor 3.4 ghz 6 mb cache that is $391 or a Intel core i5-4670k quad-core desktop processor 3.4 ghz 6 mb cache $274
The i5. Upgrading a processor is expensive, but memory is relatively cheap. 4Gb is usually enough for your average computing needs, and you can always put more in later. Plus, the i5 has more cache memory and is all around more efficient.
intel i5 generally however some amd's will be better than i5's and vice versa
How install Microsoft windows- xp in core i5
Not likely unless you can find a refurbished tower for that price.