No External VGA card la
Seems like you only have PCI slot, ( white 果條插槽)
This is 4-6 yeas old technology, Only used for display in PIII CPU computer.
Good quality that is equal or better than your on-board card will cost 4000HKD up to 50KHKD. With that price you can get a new Core 2 Duo system la
How old is your computer if your PC older than 3 years, most of the components on it ( except the HD and DVD rom) is useless for upgrade now. However they are still very good for office type work or simple games or video.
If you buy second hand card, may be they are the same quality as your on-board one, so no need to buy.
If your CPU is Core Duo or anything that use socket 775 then get a new mother board with PCIEX16 slot and get a good display card with it la.
All socket 478 cpu and product will disappear in 2007