So I have a Dell Optiplex GX620 Intel Pentium Dual Core 3.20 GHz, running Windows 7 32-bit and the current limit for RAM is 4GB. How can I increase this? I realise that I may have to change the motherboard, at which point it will no longer be a GX620 but if it's the only way to get more than 4GB RAM then so be it. Which motherboard would be best to switch to? I want to update to Windows 7 64-bit so I can utilise more RAM for my home studio set-up, which will include running programs like FL Studio 9, Adobe Audition 3.0, Reaper, Cubase LE, recording interfaces and a MIDI keyboard. What I'm running now may be enough in the end but having more RAM for such a set-up always puts the mind at ease. Any advice would be helpful, thanks.