The cheaper card that you can't use is actually a direct replacement (a generation up) from the card you need to now get. You won't notice it though as it's for mainly desktop use and the extra memory in the card you would make up for a it a bit anyways.
Oh, and forgot to say, looks like your existing card is on the motherboard instead of in a port, all you'll need to do is prior to installing the new card, go into the BIOS screen (usually F2 or Delete just after your PC turns on) and find a setting to turn the card off.
It's more of a precaution though, your system may end up booting fine even with the motherboard card turned on.
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