well, it's a case by case basis, but my desktop has this processor: http://ark.intel.com/products/77780/Intel-Core-i7-4930K

which does not have it

but my laptops both have it.. :\

http://ark.intel.com/products/43559/Intel-Core-i7-620LM

http://ark.intel.com/products/53464/Intel-Core-i7-2640M