as Whateverworks_19 said, the PSU is a low tier quality of a PSU compared to a Seasonic or an XFX brand.
the RAM you have is an unusual combination, dunno if it is 2 sticks of 3GB or 1 stick of each 4GB + 2GB, also the speed is only 1333Mhz. Common setups have 2 sticks of 4GB = 8GB of RAM for dual channel. also 1600Mhz is what you want to get with CAS Latency of 9 or below. I know it gives very minimal effect on REAL WORLD usage but comparing that to your current setup of 6GB, it would definitely improve your system overall.
as for your mobo, it's an old gen one, he suggests the mobo i think for additional features which i dont know if youd use or probably for you to open up an upgrade path in case you want to in the future.