OMG, I am going to answer the question;
Use MSI afterburner, it's easier to use.
When you overclock you lose your warranty because of the risks of frying your card.
Although every one overclocks and doesn't care about their warranty as they know what they are doing.
Before buying a new card you HAVE TO try overclocking it as it does make a difference. If you are not satisfied with your overclock, go for the aboves advices on upgrades but it really wouldn't hurt to attempt an overlock
Download MSI afterburner and furmark.
Leave the fan control on your card on automatic and increase the clock of mainly the core and memory slowly first by about 50MHz.
Apply and then run furmark to do a GPU stress test; this will push your GPU to it's limits. Run it and watch the temperature of your GPU, after 30 minutes to one hour if it didn't shut down, bluescreen or overheat that means that your overclock is stable and you can try to overclock further.
If your temperatures didn't get too high, increase by another 50MHz or 25MHz if they did.
Just keep increasing and doing stress tests.
Before doing further overclocking see if the game runs well so that you don't overclock higher for no reason.
DO NOT overclock extremely high as is it will damage your graphics card.
If you get a high temperature when you overclock though your computer doesn't shutdown. It will probably shut down if you go any further.
Don't keep overclocking until your computer shuts down to save itself as it may not always succeed so just go with very minor clock increases and when the temperatures are significantly higher than they were stop an test the game during your overclocking.
I have once damaged a card because I overclocked it by 300MHz from the start and the card had a bad cooler and I didn't do a stress test.
I was 12 lol.
So sure it would be great to upgrade but it really wouldn't hurt to overclock as if you destroy your card which is unlikely if you followed my instructions.
If you don't get the performance you need upgrade as you ave good CPU for gaming so with a better card you will be able to play all the latest games at high settings