T400 XP SP2: Will increasing RAM have an effect?

Hello...
I have a T400 running XP SP2 (32 bit) with the 3 GB RAM that the machine came with. I am wondering how much RAM I can install and if adding RAM will have an effect on speed? 
Thanks for any help....
Best,
Mavec

your 32 bit os would only allow you to use a maximum of 3 gigs of ram, if you need more ram then you would need to get the 64 bit os. 
You should consider a SSD HDD instead. 
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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