Change HDD space to RAM?

You need to realize that your hdd will never be nearly as fast as your ram, so while in critical situations(running many many programs.) you will see a small difference, but in basic task you will rarily see an improvement.
 
No...
You can expand your paging file, but 3GB isn't a low amount, you probably don't need it; most likely it won't even help, and it'll take up space.
RAM is RAM, HDD's are HDD's.
 
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