Changing the CPU on Dell XPS 400

Can anyone tell me which motherbard will work and CPU so I can upgrade this dell xps 400 to run vista Ultimate 64 bit? I was told that I needed a 64 bit CPU and would have to change the Motherboard also is that true? I have a new Video card waiting and 2 sticks of new ram to bring the system up to 4gigs but am waiting to find out about the motherboard and CPU,
Here is what I have now,

Dell DXP051
Board: Dell Inc. 0FJ030
Bus Clock: 800 megahertz
BIOS: Dell Inc. A07 01/08/2007

2.80 gigahertz Intel Pentium D
16 kilobyte primary memory cache
1024 kilobyte secondary memory cache

3072 Megabytes Installed Memory

Slot 'DIMM_1' has 1024 MB
Slot 'DIMM_3' has 512 MB
Slot 'DIMM_2' has 1024 MB
Slot 'DIMM_4' has 512 MB

maybe a link to the part/parts I would need, or info on where to buy,
thanks guys!
3 answers Last reply
More about changing dell
  1. Despite what you've been told, your Pentium D is an x64 processor so you do not need to replace it just to run Vista x64. It is not the fastest CPU out there, but it will work.
  2. GREAT !! thanks a bunch
    I was goning to purchase the vista ultimate 64bit (OEM) but thought I wasn't able to run it
    I will have to do a complete format from 32bit XP Pro to be able to install the 64 bit OS im told also,
    Thanks again for help!!
  3. I tried to upgrade the mother board in my XPS400, to a later DELL model,
    but it would not fit (I couldn't find any 3d party mfg. that would fit in a DELL?).

    My Upgrades that REALLY worked!-
    1. I upgraded to 4 gig (2gig x 2 is best!) of "matching" Crucial memory (Dual channel!). Helped some.

    2. I then upgraded my C: hard drive to a Western Digital Raptor 10k rpm Hard Drive!
    WOW!- My computer is now BLAZING FAST!

    Scott :o)
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