how do you find out the max ram/video/HD size a motherboard can handle?

[getliquid]

last game i actually played was warcraft III and diablo II, so i have a huge tech gap haha, now theres some games i wanna play like warhammer mark of chaos, WoW so i have to upgrade couple or most of my computer.... right now i can barely play Age of empires III on lowest setting, cant run need for speed most wanted at all....

how do i find out
-max Ram
-max HD space
-max video card

my motherboard support?

also AMD SEMPRON 2800 +2gb ram+good 256AGP card good enough to run the games? or am i have to get the duo core?

right now when i play warcraft for too long, the game slow down to a halt almost and processor makes a lot of noise.... on my HD i half almost 50gb's empty... whats the problem?

[goofball]

Download a program which identifies your motherboard, look up that model number on the manufacturer's site.
The info on the hard disk, you may not find, but any PC within the last 3-4 years should handle the largest drives they have now.
Exactly what video card? Saying 256MB AGP is like saying I have a car with 4 wheels. Not enough info.