How do I find out everything about my PC

I am starting to get interested in PC specs and have done some ram / gfx card upgrades. However, where can I go on my computer to find ALL of the information about it. Processor, who its made by, ram, everything. I am interested and have never known.

Also, I have 3 512 DDR400 chips and 1 512 DDr333. I know that everything is running at the DDR333 speed, am I essentially hurting myself? Is it worth getting an extra 400? Will the speed of the PC improve? Thank!!!

 

Also, I have a PC that has Hyper Threading technology. From what I have read, the mother board treats it like 2 processors. So If I have a 3.0 Mhz processor with HTT, is it running like 2x3.0=6mhz or 1.5x3.0=3.0mhz?

 

For all your PC info, try one of these:
Everest http://www.majorgeeks.com/download.php?det=4181
PCWizard http://www.majorgeeks.com/download3846.html
System Info for Windows (SIW) http://www.majorgeeks.com/SIW_System_Info_d4387.html
All are free to download and use, and they'll all provide very detailed information about all your hardware (incl. model numbers, manufacturers, detailed part specifications, etc) and details about all installed software and Windows.... good stuff
Your motherboard manual and the makers web site can be wealth of info also, plus some good utilities can usually be found at the web sites also. As to your RAM question; there's two ways to look at this. First, RAM is so cheap these days (esp. DDR2), that buying another 512mb DDR400 is very inexpensive and having all your RAM at the same speed is definitely a good idea, especially if it's a dual channel system. On the other hand, even if all the sticks were running at 400, you probably wouldn't notice any increase in performance. The PC will run more efficiently with 4 DDR400 sticks, but you wouldn't see any speed increases.