here is my MB information (I dont know the model number) Motherboard ID 11/26/2002-SiS651-P4S533VX Bus Type Intel NetBurst Real Clock 133 MHz (QDR) Effective Clock 533 MHz Bandwidth 4266 MB/s Bus Type SiS MuTIOL Bus Width 16-bit Here is the Pentium 4 I would like to buy http://www.newegg.com/Product/Product.asp?Item=N82E16819116172 Would this be a good upgrade, and is it compatable with the motherboard i have. What specific MB properties are required for a cpu? Thanks

No that processor would not work in that board. Your board has base FSB 133 quad pumped = 533. The processor you've selected needs base FSB 200 quad pumped = 800 effective clock speed. The processor you've selected is socket 478. Is the board? I don't know. You need to find and read your motherboard manual. Does the board support HTT? What is the fastest P4 processor with 533 clock rating? I used to have a signature but it disappeared and I just couldn't be bothered writing another so please feel free to ingore this.

Yes its socket 478 and I dont think it supports HTT it was made in 2002, but I could be wrong, im having trouble finding the model number, I have Everest and other programs and its not showing a model number on the board thanks for the help

how about replacing my Mobo... (assuming this one fits in my vaio case) http://www.newegg.com/Product/Product.asp?Item=N82E16813131566 and getting a new CPU with a better FSB and frequency

Is that Mobo a 64 bit? im assuming no since it does not say, but would that Mobo be compatable with this CPU? : http://www.newegg.com/Product/Product.asp?Item=N82E16819116201

Your questions are going beyond my level of expertise. Since you are dealing with a proprietary (name brand) system here there may be other compatibility issues to consider such as case configuration and powersupply connection differences. I do not know whether any of those things apply to Sony systems. In other brand name boxes they are critical factors. If you are going to upgrade your motherboard/CPU you may also need new RAM, a different powersupply and better graphics. Starting to look like you may be better off selling the current rig as-is and buying/building a whole new unit. I used to have a signature but it disappeared and I just couldn't be bothered writing another so please feel free to ingore this.