Hi all,
I`m probably "The newbie" around here but anyway, i have done some reading lately and decided to have my first post. Believe me or not, i heard BTC for the first time from my economics profesor, talking about 2008 financial crisis. That was few monts ago and I was shocked that something so big is going on without me knowing anything about it, regardless of being a graduate student who studies economics. But, heeey, don`t judge too hard on me cause most of the people i meet are still like "Whaaaat coin? or "Don`t you mean BitTorrent?"
Anyway, no more jiber jaber, here`s my ask:
I have a Desktop PC which i use only for nothing. It`s graphics card burned out long time ago, maybe by the time when it would have been wise to buy new one and start mining BTC but whatever. As i see it of today i can do the same but mine for LTC, right? Here is what i have, altought not really sure what it is actually

DualCore AMD Athlon 64 X2, 2000 MHz (10 x 200) 3800+
Asus M2N-MX, 1 Socket AM2, 2 PCI, 1 PCI-E x1, 1 PCI-E x16 with integrated video - nForce6100-430
2 GB RAM, some SATA hard drive and etc.
Im a little bit lazy to open and check for the power supply but i think its something like 450-500W Fortron. I am trying to figure what ATI GPU can i add while keeping the other stuff (maybe not the supply), for max Kh/s. For example, can i put some 7850 and start right away or it is not that simple. You know, im trying to spend some 200-300 bucks just to make some use of the PC. I am very much interested in any suggestions and ofcourse any donations as i see begging for money here is conventional enought
Thank you