You MIGHT get 1% to 3% improvement by changing motherboard and memory, if you leave everything at stock speeds.
Definately do not buy that memory. It is cas latency 10 memory your kingston is probably cas 9 memory.
Memory does not make very much difference now that the memory controller is on die with the processor.
If you were running an on die video chip such as the Brazos platform better memory makes a difference.
First question would be.
Are you running 32bit or 64bit windows?
If you are running 32bit an upgrade from 4gig to 8 gig will not help at all. Windows will still only see 3.25gig or so.
If you are running 64bit an upgrade might help.
Only a few games and programs use more than 4 gig of memory.
I have always used Corsair ,Crucial or Kingston memory.
They have better compatability with most systems.