whats the difference between 6770 and 6850....if that card is petite id hate to see a "big" card. I did keep the peice of junk psu. I figured id try it out and see whta happens...at the store last night i asked the guys there and they said they wouldnt buy a new one. usually stores want you to spend money so i took their word on it.
6770 is slower but consumes less power and it is cheaper.
The guys at stores sometimes don't know what they talking about, though (or *cunning/malicious mode* they might want you to burn your PSU and GPU so you spend even more money *end of cunning/malicious mode*). And you bought that PC at MC, didn't you? They might not want to tell you "yes, we pack our pcs with piece of junk PSUs that lie about their specifications".
It is running so far and probably won't be any problem. If you start having weird problems like crashes and/or computer lock ons, be careful.
whats the 5400 rpm drive? not sure what that means.
Mechanical HDD spin so they can access the information stored in different parts of it. An easy analogy is rewinding or fast forwarding old cassette tapes to reach the information desired.
The 5400 rpm is the speed at what the HDD does it.
Most desktop HDD run at 7200 rpm. 5400 rpm HDD are generally used on laptops to save power. There are also some higher performance HDD that run a 10000 rpm but since the advent of SSDs these units lost some of their appeal.
Basically the higher the rotation the faster the HDD can access its information.
EDIT: Guess lehtv beat me to the punch.