It's irrelevant. The 32 bit client manages 64 bit sciences, which all are available except for CEP2. Presently latter only runs in 32 bit [next version is likely also in 64 bit]. The client is just a scheduler of science tasks. The core client otherwise does nothing, using < 1 minute a day. Mine has been up since last test client update for 4 hours and Task Manager has logged 5 seconds used.... extrapolated that's 30 seconds in a day.