I have a Dell Inspiron 1100. I have done many upgrades and I'm pretty proficient at installing my own hardware. I've decided I would like to upgrade the CPU. Here's what I have....Intel Celeron 2.0ghz 400mhzFSB 128KBcache Socket is 478mPGA and the manufacturer is Northwood. I would like to upgrade to the best Pentium4 processor that my motherboard can handle, but the only information that I can get on the motherboard is the Chipset (845GL). I've already tried contacting Dell and that is all they will tell me since they do not support CPU upgrades. I ran a couple 3rd Party Programs to tell you what hardware is on your system, how's it running, and where you can upgrade. (PC Wizard 2008 and InSpecs.exe) I was given information that my motherboard could support a CPU up to 533mhzFSB and 2.8ghz or higher Processor. Is this true? What do I have to watch to make sure the processor would work on my Motherboard. Please Help - I have been trying to research this for over a week and keep getting different answers depending on the website I visit. I have read many of the posts here and can't find one to match my needs. Also I don't do anything special with the computer and it is way past the warranty date. Just want extra speed for multitasking.