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I have pc, which have 650HZ processor, 13GB HDD, 128 RAM. And DELL , Mother board. How I can It made possible to upgrade my system so that I can have 1.5 GHZ proessor. 80 GB HDD, without changing mother board. What are limitations. What is BIOS. Thanking in anticipation

Dell is a tricky beast. So the short answer to this is .... No. The money it would take to upgrade a Dell computer (which is technically not possible) would cost more than the computer you are describing that you want. The BIOS would not support this either and you would have to "flash" or sort of upgrade the thing. I had a DELL once just like yours and I had the same issues. The BIOS is the stuff that you see that controls all of the other stuff on the mother board I think. Their are tons of different versions of Phoenix and Award bioses.

bios....thats.....stuff....can give a lot of S.H.I.T I had 2 throw my AMD athlon 64 4000+ motherboard away and had 2 get a new one. you will be better of getting a new motherboard and processor and get one without onboard grafix and get a decent grafix card. see the problem with your pc is your motherboard cant handle a bigger processor and if it at all came on you would have endless problems like lag and up pc freezing during game play and restarting by its self and windows errors trust me its not worth it rather spend some cash and be better of because then you can play all the gud games 2 think about it