r9 290

Ok so I'm hearing this alot psu so what is it an how do I upgrade it? as if you mean buy a more power full power pack say 400w or 500w it says on HP if I don't use the recommended pack I'll void my knowhow insurance? I've a good mind ring them an say hey I've never made a claim since 2012, you...

I am wondering if lag is something that you just have to expect or is it possible to have no packet loss or lag or rubberbanding etc. What are the things you can do to improve the situation? I seem to get packet loss on battlefield 4.