yes, you can add as much ram as your board can support but please do read the board's manual esp. on:
1. size of dimms (e.g. 2gb or 4gb dimms)
- you might buy 2gb dimms only to find out your board can only support up to n number of 1gb dimms
2. platform: sdr, ddr, ddr2, ddr3
- nothing can be more frustrating than buying the wrong type of ram (e.g. buying ddr for a ddr2-based board)
3. supported ram speed (ddr266/333/400, ddr2-533/667/800/1066, ddr3-1333, etc..
- buying ram that is too fast means unneeded/unnecessary expenses; while buying ram that does not maximize your board's capability means you won't be getting the most from your board
4. if you plan on running a dual-channel setup (granted your board supports it), try to get dimms sold in kits (e.g. 2x1gb, 2x512mb, 4x1gb, etc.) as these are factory tested and dimms' characteristics is guaranteed to be the same by the manufacturer, as compared to buying the dimms 1 piece at a time (if you do, at least make sure they have the same part numbers). this is if you want to be on the safe side... (for users of boards supporting intel's flexmem, you may use different-sized dimms and still be able to run in dual-channel mode)
and yes, system memory doesn't have any relationship with what's on your hdd (so no need to re-install anything).



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