How much money are you wanting or willing to spend on upgrading a video card?
Also if your happy with the performance what do you want a new card for. Just because your monitor is going to sleep does not necessarily mean its a faulty graphics card.
Maybe you should let us know what your power supply is rated at and we can give you some suggestions based on it.
If you need any more help just feel free to ask
Also a lot of budget video cards run @ 100% fan speed all the time, this is not uncommon or bad.
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