Find great deals on eBay for dell dimension 4300. Shop with confidence. Skip to main content. eBay Logo: 300 Watt Power Supply Upgrade for Dell Dimension 2400,2450,3000,4300,4400,4500. Brand New · Unbranded · 300 W · MicroATX. $25.88. Top Rated Plus. I have a Dimension 4300 and want to upgrade the ram. Dell support has given me at least three different answers. One person said that the manual is wrong and that my computer will recognize a lot more ram than the stated max of 512. Do not know how to open a Dell Dimension 4300 case. There's a large plastic button on the top at the back, but it doesn't appear to release any parts of the case. Tower 4300 manual dell dimension 4300 open case open dell 4300 computer case face booo open dimension 4300 case open 4300 dell Dimension 4300S. Dell DIMENSION 4300S I just upgraded a Dell Dimension 4300S. 4300S is a low profile design and has more limitations than the 4300. Cards are PCI slot type - low profile. Connections are PATA / IDE. You should probably avoid SATA, PCI Express. CPU was a Pentium 4, 1.4GHz. The 2.8 SL7EY and AO6 BIOS works just fine. The Dell Dimension series was a line of home and business desktop computers manufactured by Dell. In 2007, the Dimension series was discontinued and replaced with the Dell Inspiron series for low-end models and the Dell Studio series for higher-end models. DELL TH-079WPJ Dell Dimension 4300 4400 4500 200W power supply. More Buying Choices $187.51 (1 used offer) Genuine Dell P0304 K0564 Power Supply PSU 200W. 3.7 out of 5 stars 20. More Buying Choices $20.00 (8 used offers) The Dimension 4300 from Dell is a well equipped and reasonably priced system that delivers good, but not stunning, performance. Based on a 1.7GHz Pentium 4 processor and featuring both a DVD-ROM