The k means that your CPU is unlocked, it helps a great deal to overclock it, nothing else as I recall. You should be fine but remember meeting minimum merely promises it will work, neither great graphics or performance will be achieved (this game like most these days are GPU dependant more than CPU so it will depend more on your GPU).

What GPU do you have?

im going to order lp 750 ti

I found a thread where someone reports this with a GTX 750 Ti:
What Resolution am I set at: 1920x1080
What are my avg FPS: Low 45-55 FPS, medium 35-40, high 25

If that is acceptable to you, you are good to go.

I should mention that the minimum GPU for the game is GTX 660 / HD 7870. While the game will probably work, I don't think you can get a refund by GOG since even if you would have technical issues, the developers only offer help as long as you meet minimum requirements.

I'm playing Witcher 3 on oldish PC with Intel Core2Duo E8400 3.0 GHz, Nvidia GeForece GTX560Ti, 8 GB RAM set to 800 MHz (they're 1033 but I don't want to overclock my rig) under Windows 7 64-bit. My display is Eizo S1932 with 1280x1024 resolution. This allows me to play W3 on medium settings (minus "hair works").

ok thanks