Many people asking me this question so I have better make clear explaination here.
First of all, from the technology point of view, the 4 thing is about the same. But Intel make different name for them for marketing and different range of pricing.
Here are some of the features of these LGA 1155 processors :
2 core and 4 core : i7 normally has 4 cores but the others has 2 cores except some expensive i5.
Hyper Threading : Useless technology by Intel. Only the Pentium G620 doesn't has it. You will see 4 cores on your OS but actually there are only 2. Another 2 are virtual core. The virtual core was generated using extra cycle from your CPU. The truth is if you have extra CPU cycle, you don't need hyper threading. The shit just confuse your operating system.
Turbo Boost : Only i5 and i7 has this thing. The CPU can increase speed by 30 % for a few seconds. But this is just for temporary only. I don't see any benefit of this thing.
Clear Video : Only on i5 and i7. This thing can directly decode your H264 and mpeg 4 movie within your CPU (aka H264 hardware decoding) . But CPU nowadays are powerful enough to decode all these movies using software. Unless you want to watch Super High Resolution Full HD video (where to get this kind of video ?), you really don't need this shit. Do you know that computers nowadays can directly decode mpeg2 (aka DVD). But nobody use this features anyway because the software is good enough already. Software can be upgraded but hardware can't.
True 3D technology : This one on i5 and i7 only. can render 3D thing in the CPU. Useless unless you play racing game and 3D shooting game. And if you really serious into gaming, buy AMD.
Conclussion : It is all the 'price' thing. Buy i7 and i5 if you wanna show off you are rich. Buy G620 if you want to do serious work and wanna save $
One walk, one run, one fly, you choose.
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