Is it lunch?
Nobody knows - it depends entirely on my appetite, time zone, time from breakfast and blood sugar levels. As I haven't informed anybody as to my particular situation and cirumstances, they can't make an objective or valid recommendation.
As the first reply queried: what is your computer used for? Gaming? If so, are the frame-rates dropping to levels which impact on your gaming experience?
Encoding? Are you spending far too much time waiting for your videos to reformat?
Rendering? Are you losing money because your box simply cannot churn out the pictures/animations fast enough?
Surfing the net? Are you streaming HD p- err, stuff, and is your computer struggling as a result?