Help me upgrade this old POS PCs

[rostb]

Sorry, I know you discuss cool new systems here. But I have some old office PCs here, and desperately need to upgrade them for cheap.
PC is like this one here:

http://www.ebay.com/itm/Dell-Optiplex-GX280-Intel-Pen-4-3-40GHZ-1GB-Ram-80GB-HDD-Window-Xp-Pro-/190724773331?pt=Desktop_PCs&hash=item2c681515d3#ht_560wt_1397

Specs are Pentium 4 CPU 2.29 Ghz with 2 Gb RAM.
I have of them. Need to have duo or even quad core CPU, with at least 4 or more gigs of ram. Preferably keeping my current HDDs.
Is that even possible with this old computers? How much would it cost and what should I buy? Or do I have to invest in buying new computers?

Thanks!

 

[Tmant123]

That is pretty much un-upgradable. The hdd is IDE, I've seen inside those systems before. If you're getting a new system, some still have an IDE port. Here's a budget based build:

http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.1018815&Tpk=1018815

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130641

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103942

http://www.newegg.com/Product/Product.aspx?Item=N82E16827151256


These together should create a good budget based system for around $310.

If you don't know how to build, then you'd have to invest in a new prebuilt.

 

[DJDeCiBeL]

If they really are GX280's (like the one you linked), they only support P4 5x0 and 6x0 CPU's. No duals (and certainly no quads) are compatible.

 

[rostb]

thanks. off to buying new computers, then

 

[mavroxur]

That computer has reached the end of the road. Opti 280's won't use Pentium D's, so you're stuck with with single-core Pentium 4's.