amoffat20

from the picture, im assuming you have two 4GB sticks, and only two slots for them, in which case you will get away with any set of two 8GB sticks, if you have four slots you will be best expanding with two more 4GB sticks which will require RAM from the same maker at the same speed.

that sounds unhealthy, you might want to consider replacing an ssd doing that...

is it specifically your gpu, or is your cpu under load at the same time cause your cpu could easily cause a network speed drop, otherwise, the gpu might be pushing over some amount of processing through data transfers in order to slow your cpu, but im just speculating...

to help with that you'll have to tell us what your budget is and what gpu you have in order to base the part selection and power levels upon them.

I reckon if you wanna keep the pc and upgrade, you wont need anything better than a 770/r9 280 cause your processor will soon otherwise start to limit the usage of a better graphics card. If that's where you wanna go, you will need a higher rating power supply in the range of 500w depending on the graphics card you get. Hope this helped!

i would take the mouse cause my current mouse has a broken sensor on the scroll wheel leaving me stuck with page up and down on webpages