4 GB RAM is too little, 8 would be better, 16 is luxury. Capture does not really demand much from a computer's processing, especially with 16+2 tracks. Recording 64 tracks might be a different thing. Please note that you can not use Capture and Studio One simultaneoulsy (recording and processing). For recording take Capture. It's easy to use and efficient and you can record for hours and hours. You don't even need to label the tracks, as Capture reads the channel names of your mixer.
Studio One and its processing take a lot of energy from your computer, so this may well cause some heating problems. I haven't found any thread about this theme in the forums, but I remember that somebody talked about it somewhere sometime...
And remember to buy the right adaptor for Thunderbolt/FireWire.
Hope this helps.