Remember, mtrlt released to the public the *demo* version, aka slow version. This version was just to prove Scrypt is more efficient on a gpu than it is on a cpu.
Using dishwara's numbers from that screenshot (219kh/s), and an estimated 5870 power consumption of 188w, that makes for 1.16kh/w.
Using data from the litecoin wiki it seems a top of the line cpu gets 25kh/s at 125w, that makes for 0.2kh/w.
Being generous, and assuming the litecoin wiki is out of date, and using poolers latest miner, lets just give the cpu 50kh/s at the same 125w, that is still only 0.4kh/w.
Scrypt is *not* gpu unfriendly.
BTW, the current private version of Reaper is getting over 2kh/w when mining scrypt.
Comparing GPU and CPU mining and the power required... Why is it that the power used in the computations are only the consumption of the GPU? GPU's can't do squat without a CPU. CPU can mine even with a crappy Intel IGP. When comparing power numbers, please use the wall usage numbers.
No, coz unless your using a crappy GPU miner, the miner will hardly use any CPU - so the CPU is available for whatever else you want to do with it.
My linux box downclocks itself to 1.2Ghz (from 3.07GHz) and still uses only 2% of a single CPU to GPU mine BTC (2x6950)
Thus yes if you are wasting that CPU and doing nothing with it - you are ... wasting that CPU and doing nothing with it.
The discussion here, however, is about LTC and if you are silly enough to waste electricity on LTC GPU mining, then you would most probably also be LTC CPU mining ...