Posted 19 May 2010 - 08:50 AM
I am going to simplify what got said in the second post.
Point 1: You have a proprietary computer and so the motherboard and case were designed to fit each other, you also have a cheap Power Supply
Point 2: In order to get a general aftermarket (ATX or any derivation) motherboard that fits properly, you are going to need a case because it won't fit in yours
Point 3: Your power supply may not have the required connectors to power the new hardware. You will need at least a 24-pin motherboard connector (many old PC's have 20-pin) and an additional 4-pin (Square not rectangular) connector. Because your power supply was selected to fit your current hardware by the manufacturer, it most likely does not have these.
Point 4: Memory is going to change, no matter what you are going to want to upgrade to a new memory spec and your old memory won't be transferable.
Ok now that we have outlined what we can and can't do, here is what you are going to need to buy and what you can salvage.
PCI Cards that fit spec on the new motherboard (If you have an AGP card there may not be a slot for it.)
With your price range I would recommend looking at AMD Dual-Core Processors, they are going to be lower in price than Intel. For $220 on JUST the Processor and Motherboard you can get a more than decent setup for basic computing, but it may not get you into the gaming specs if that is what you want. If you don't play games then don't worry about a Graphics Card, however make sure the motherboard lists a video connector and a graphics chipset. Where you are going to get shocked on price is the Memory, 2GB of DDR2 (the least I would recommend for anyone running Windows) runs about $50 for a decent brand. Besides that you can probably get the case and the power supply for less than your memory cost.
For a build budgeting $220 for CPU/Mobo I would then say $350 is a decent price to shoot for by the time your system is done... Except for the OS but that's another discussion.
AMD Phenom II X6 2.8ghz
8GB DDR3 RAM
XFX ATI Radeon HD6850 1 GB DDR5, 26" Widescreen HDMI
500GB + 80GB HDD
Windows 7 Pro, Mozilla Firefox, AutoCAD 2011, Solidworks 2009