That's not a terrible card, its good!
Coolbits is the best, its just a registry edit (done automatically) which unlocks the overclocking tility built into all Nvidia drivers. Google it.
Increase one by 5mhz at a time, run 3dmark, if no odd textures or colours (artifacts) then keeep increasing that one (either core or memory) until you do see them. Then decrease by 10mhz to be safe. Now, with that done, do the same with the other (memory or core) until the same occurs. Now decrease 10mhz. Now with normal cooling, you're maxed out. With an Arctic Cooler (about 8 quid) you could decrease gfx temps by 10 C so that's more overclocking posssible.
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She says brief things, her love’s a pony
My love’s subliminal