Hi nakulgupta,
you can marginally improve performance on the 3.4 GZ machine by decreasing the screen resolution..but.. you probably won't be happy with it.
Best advice is to go ahead & get a PCX OR AGP graphics adapter card(with lots of onboard RAM) & install it in your current 1.9GHZ computer... PLUS increase your current motherboard RAM from 256mb to max it out (ie. 512MB to 1GB).
The performance you'll get by only changing the motherboard & upgrading the processor and still using onboard ram (1GB) will be only a marginal improvement over what you already have.
Hope this is clear
PS- you can check out the RAM recommendations at my website.. it may also help
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