Intel's upcoming Clarskfield mobile quad-cores will, quite literally, be some of the hottest mobile parts on the market when they show up in late September.

In the last week of September, Intel will launch three Clarskfield CPUs, and all three will proudly carry the Core i7 brand, while one will be an Extreme Edition part. All three feature Hyperthreading andDDR3 1333MHz support.

The Core i7 720QM runs at 1.6GHz and overclocks a single core to 2.80GHz with Turbo Boost. It has 6MB of cache and it will cost $364 at launch, which sounds reasonable all things considered.

The Core i7 820QM runs at 1.73GHz and Turbo Boost can push it to 3.06GHz, it has 8MB of cache and it's priced at $546. Both of hese two CPUs will end up with an immense TDP of 45W.

Core i7 920XM, the sole Extreme Edition CPU in the new series, runs at 2.0GHz, has 8MB of cache and a four digit price tag, $1,054 to be exact. Its sub-Saharan TDP is rated at 55W, and in Turbo mode you'll be able to overclock a single core to 3.2GHz.

As all three of these CPUs are very hot by mobile standards, there's a good chance they will end up being the fastest mobile 45nm parts in Intel's lineup. There's a good chance we won't see any higher clocks on mobile quads until Intel transitions to 32nm.