In my experience, the last Intel processors that were "hot" were the Pentium 4's (Prescott in particular) in 2004. The best way to tell if a processor will run "hot" is to look at its TDP. A 125W CPU will put off more heat than a 65W or lower CPU. I really don't like saying AMD or Intel chips run hot, a 3.2Ghz quad or hexa core processor will put off more heat than a dual core 2.5Ghz processor, but will also have much better performance. On top of that, progressively smaller manufacturing processes produce CPU's with similar clocks/cores that generate less heat. Also, keep in mind that in general Intel CPU's give more performance per core, per clock than AMD chips. Because of this, between an Intel and AMD CPU with similar performance, the Intel CPU will generally run cooler than the AMD CPU because the AMD CPU will need to have a higher frequency and/or more cores.
If your current processor is just starting to get hot, I would susupect that a problem has developed with the heatsink. First, check to make sure the heatsink and fan are free of dust. Then, if the problem persists, I would suggest removing the CPU heatsink, cleaning off the old thermal paste, applying new, and reinstalling the heatsink. That should take care of your problem.
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