amd 100t costs less than i5 and it has 4 cores is it worth than i5
As Ghnader said, having more cores doesn't mean it has better performance. If you're willing to buy any of those, get the i5 2500k. It would be much better and it is FASTER than a 1100T. There aren't any games out there that uses all 6 cores. But if you're not into gaming and more into multi tasking, then 1100T would be better.
In general : i5 2500k wins.
A similar thread was there too. http://www.tomshardware.com/forum/303976-28-2500k-pheno...