You're welcome - glad to be of some small service.
BTW you might want to check your PSU power rating before hanging much more hardware on your pc especially if you're overclocked. There's a free Lite calculator >>
here<< and the Pro version with all the bells and whistles is shown to be priced at an exorbitant $1.99 (yep, just under two bucks). I've never used it but if you want another calculator there are lots on the WWW. You would want a safety margin in addition to the required power rating, so if the required rating was say 450w you would want something like 600w for safety. A psu which cannot withstand the peak loading can cause absolute havoc with hard drives.
Don't omit to backup your work to another medium (cd/dvd etc) hard drives have been known to die suddenly.
Good luck with your pc and with your studies.