ASUS and Gigabyte's cards are pricey, you may opt for Leadtek GTX670, which is priced at RM1149 which is close to the HD7950 price range. Also theres not much difference between the two manufacturers besides their clock speed, cooler etc. overall performance are similar

Also, as shown on my previous link, the difference between these two cards are negligible. Also, the GTX670 and HD7950 is a high-end tier card. This means that itll be able to last you maybe 2 years max depending on how long it can last before the next worthy upgrade

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Added on December 17, 2012, 3:01 am
A HD7750 or HD7770 should fit your budget. But dont expect a huge change in performance though

Personally, i suggest you opt for the HD7850 at RM600+, which gives you a considerable difference in performance

It should be enough, based on what power supply Acer says the M7720 comes with ( 500W / 750W / 1000W ).

Actually by current standards, 1GB of VRAM is considered as little considering the amount of texture memory games demand nowadays. .

It will be compatible as long as your motherboard has a PCI-E x16 slot and your power supply has enough power.