I have a 1.83 C2D Combo 1gb 80 hdd. I recently restored it with the original tiger install discs. I did not setup email or transfer any data. I cloned my Leopard MB to a 250 gb WD Passport. I am booting the mini with the passport. It runs awesome. I am not doing anything professional and it is perfectly fast. I have Alesis studio monitor speakers, Acer 22" display, bluetooth KB and mouse. I am right now Listening to Dead Show Podcast (downloaded), watching the Forum Spy, checking email every minute and looking at iphotos just to check stability. Last night I watched a mp4 movie while doing other tasks with no problems. I just checked my fan speed of 1509. I just muted speakers to check hdd noise and it is very smooth and almost silent.