You could try a better VGA cooler, but it could be difficult to get one that's compatible with your card.
It has a PCI-E x16 slot according to the specs (click here), so here are some options if you go for a new graphics card:
ATI: click here
Nvidia: click here
Please be aware that some have large coolers that'll occupy at least one adjacent expansion slot.
Choose Super Saver delivery at checkout to keep costs down.
Shop around as you may find them cheaper elsewhere, & also look on eBay where you could pick up a bargain. G