I can't find any articles relating to the old, old Dell Dimension B1100.
Are you looking for this?
And, yes, it's a socket 478.
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XPS 730x H2C (aluminum clear coat chassis)
Windows 7 Professional x64
Intel Core i7 920 @ 3.60ghz (soon-to-be a Core i7-975)
6gb Corsair Dominator DDR3-1600
(4) - 300GB VelociRaptors with (3) in RAID0
Western Digital MyBook 1TB
(2) - XFX Black Edition GTX 285's in SLI
(2) - DVD/RW+CD/RW Drives
Creative X-FI Titanium sound card
Logitech G5 laser gaming mouse (blue)
Logitech G19 gaming keyboard
Logitech G35 headset
Dell 3008WFP-30" LCD @ 2560x1600
X-TRAC Ripper mouse pad
I plan to be getting this CPU :
Hope fully it works, also what is the max RAM upgrade?
The P4 3.0 Prescott 3.0GHz 1MB L2 Cache Socket 478 89W Single-Core Processor, shown in your link should be fine.
The maximum memory the B110/1100 supports is, 2gb.
Note: For maximum performance, the memory should be installed in matching pairs.
For memory that's certified to work in the B110, has a lifetime warranty and free S&H on orders $40.00+, go HERE.
So the NVIDIA 8400GS PCI, is the best upgrade that I can get for the GPU?
It's a good card, but I'm not certain it's the 'best', check out the PCI card HERE