When I use Core Temp and Speed Fan to look at my CPU temperature, they both are about the same, but the BIOS shows it at about 20 degrees Celsius higher! What do I trust here?

the bios actually reads it that high yes i know its absurd. it says 120 degrees celsius/240 or so degrees F. so does that mean the bios could just be reading it wrong?

I think I am finally ready to upgrade my mobo, processor, video card and RAM, and I think I have found the right parts, thanks to Newegg. I just need some other people's opinions who probably have more computer experience than I do to double check me. Basically, I just need to know if these things will work together.

Motherboard- http://www.newegg.com/Product/Product.aspx?Item=N82E16813127003#spec

Processor- http://www.newegg.com/Product/Product.aspx?Item=N82E16819103773

RAM- http://www.newegg.com/Product/Product.aspx?Item=N82E16820220144

Video card- http://www.newegg.com/Product/Product.aspx?Item=N82E16814150229

And one final question about hard drives, if I have an external hard drive, then do I even need an internal hard drive to run the computer? thanks.

im looking at completely upgrading my computer soon with a new motherboard, processor and video card. I think I have gotten some good stuff together but there are some basic questions i need answered before I buy. The first one is about the motherboard'smemory standard specification. It says that the memory standard is DDR2 800. All I need to know is if my 2 gigs of PC3200 will run on this motherboard. if they won't, then I guess it is time to get new memory as well. The other question I have is about the hard drive. I am not quite sure what hard drive I have right now, it came with the Dell Dimension 8300, I just don't know whether an old hard drive like that will run on a new motherboard. If I need to figure out what hard drive I have to answer that question, can someone tell me how to figure that out? Thanks, with these questions answered i will finally know whether I need to get even more stuff or not.