Official minimum system requirements:
Early Acess FAQ:
Source: http://www.swtor.com/preorder/faq
Processor:
AMD Athlon 64 X2 Dual-Core 4000+ or better
Intel Core 2 Duo Processor 2.0GHz or better
Operating System:
Windows XP or later
RAM:
Windows XP: 1.5GB RAM
Windows Vista and Windows 7: 2GB RAM
Note: PCs using a built-in graphical chipset are recommended to have 2GB of RAM.
Video Card:
Star Wars: The Old Republic requires a video card that has a minimum of 256MB of on-board RAM as well as support for Shader 3.0 or better. Examples include:
ATI X1800 or better
nVidia 7800 or better
Intel 4100 Integrated Graphics or better
DVD-ROM drive - 8x speed or better (required for installation from physical editions only)
Internet connection required to play.
Early Acess FAQ:
Early Game Access
What is Early Game Access?
Early Game Access for Star Wars: The Old Republic is an opportunity for those who have pre-ordered the Game to start playing before the Games official release. Pre-order customers will be allowed to play the Game from when Early Game Access starts until launch without obligation.
When does Early Game Access begin?
Early Game Access will begin prior to the official release of Star Wars: The Old Republic. Precise dates will be revealed at a later time.
When does Early Game Access end?
Early Game Access will end on the day that Star Wars: The Old Republic is officially released to the general public.
After Early Game Access ends, will I get to continue to play my character?
Yes. All characters created during Early Game Access will continue to be available in the live Game. You will need to redeem a Game Code if you wish to continue playing the Game without interruption.
What do I need to do in order to get Early Game Access?
The only way to be granted Early Game Access is to pre-order Star Wars: The Old Republic and redeem your Pre-Order Code at our Code Redemption Center prior to the official release of the Game. Once you have reserved your copy of the Game, redeem the Pre-Order Code you receive
How will I be able to gain access to the Game in time for Early Game Access?
Customers who have redeemed their Pre-Order Code for Star Wars: The Old Republic will be notified via email prior to the beginning of Early Game Access that the Game client is ready for download. Another email will be sent at the beginning of Early Game Access to inform players that they can now access Star Wars: The Old Republic
Can I give my Pre-Order Code to someone else?
Yes, but only if you have not already registered it to your own Star Wars: The Old Republic account. Once a Pre-Order Code is attached to a Star Wars: The Old Republic account it is locked to that account. Pre-Order Codes that are redeemed on our Code Redemption Center are locked to the account through which the code is redeemed.
What do I do if I experience problems downloading the Game client and cannot gain entry to Early Game Access?
Contact the BioWare Customer Service team with any problems you are experiencing in downloading the Game client
Will people who pre-order physical copies of the Game still qualify for Early Game Access before the Games launch?
Yes. Early Game Access is available to everyone who pre-orders Star Wars: The Old Republic and redeems their Pre-Order Code prior to the commercial release of the Game.
Source: http://www.swtor.com/preorder/faq