Wondering if the windows experience index base score would be a good indicator of how fast v4 will run on your computer, or how happy you will be with v4 on your system. I searched for this topic to see if anyone had already talked about it, so if I missed it, forgive me and give me a link please.
The score in vista goes to 5.9, the highest score in 7 is 7.9 (I think these are correct).
As a start, I have 3 computers with logos 4, desktop at home, desktop and work, and laptop.
Home has vista, quad core, 2.3 ghz, 64 bit, 8 gb, gaming video card, and 5.9 rating, and logos flies.
Work desktop has win 7, dual core, 1.8 ghz, 4 gb, 32 bit, good video card (1 gb onboard), 4.6 rating, and logos is very good. I fixed this one when logos 4 came out, it had a 256 video card, and rating of 2.3, so I replaced the video card and that really revved up logos. 2.3 was too slow to be happy with logos 4.
Laptop is a tablet model, win 7, 32 bit, 3 gb, 1.8 ghz, a built in video card, rating of 3.0. It is noticably slower than the other 2 but not intolerable. If this was my only machine, I could live with it.
From my experience, anything below a 3.0 rating might not be able to run logos 4 fast enough to keep most people happy.