What Do All The Cpu Instructions Really Mean?

With an upgrade seemingly imminent, I was comparing a couple of similar Kaby Lake processors; an i3-7350K @4.2 GHz w/ Intel HD Graphics 630, and a Pentium G-4560 @ 3.5 GHz w/ Intel HD Graphics 610. Both 14nm, 64-bit, 51W, 350MHz base memory clock, and they share 15 instructions out of 20. The remaining 5 are on the i3 only; AVX, AVX2,BMI1, F16C and FMA3.

I got nowhere trying to comprehend the definitions, etc., that I found; any ideas about what performance factors will be lacking on the Pentium CPU?

Thanks;

Gregg

 

http://cpu.userbenchmark.com/Compare/Intel-Pentium-G4560-vs-Intel-Core-i3-7350K/3892vs3889