Icwhy

Ok 6 is a little much but on my fresh install I have these specs :

This is normal windows uses a set amount of ram to keep the system usage at max speed it depends on your installed ram size for example I have 24 gig ram and a usage of around 4-6 gig ram on a clean install. If it bothers you there is a setting to lower this but I cant remember where it is located do mind that this is reserved ram and is used if needed by an application.

You need to connect the molex cable. Whitout it the leds don't have power, if that doesnt work try wiggling the connection of the 4 pin connection it seems to be of low quality and break fast...