I use a laptop that's got an external PCI-E graphics dock for the sort of screenery that Roland recommends, although the graphics dock's just plugged into a 30" HD LED consumer TV. It uses a midrange desktop graphics card that, in this configuration, gives around the same graphics performance as a respectable gameable mobile, giving 2560 x 1600 res that can be arranged through two HDMI and two VGA outputs as well as the PC's screen. Apart from the (hot pluggable/unpluggable) graphics versatility, the PC itself is nothing to write home about: a compact 14"-screen-in-a-thin-bezel 13" chassis, SU7300 CULV now three Intel generations old, but 8Gb RAM and around 5 hours battery, but 32/64 bit dual boot and only weighs 1.4kg, cost less than $500 and runs TC without a sweat. TC also runs faster on my windows tablet, which is 64-bit netbook-spec 1 GHz AMD processor/graphics chip and 4Gb RAM, than it used to on an old Dell with a 2.4GHz/1Gb Celeron. My usage is for designs that might have up to a couple of hundred features per part, but I try to minimise dependencies and work in subassemblies to keep part counts down where possible. With that usage, I don't think I was going to be banging on the engine-room door demanding more power than 32-bit could give me, but I also wanted 64-bit rendering advantage. I'll probably stick with 32-bit until I'm confident that 64-bit's just going to work the same, but faster.