I'm sure it has at least one fan. As for how noisy it is, I have no idea. I was looking at the Gateway 600X. I almost got it instead of the Dell Inspiron 8200. I'm quite happy with my I8200 (I'm not sorry I got it over the Gateway). I just read a review of the Gateway in some magazine (PC World, PC Mag, CS???) and it didn't do so well. It had a few problems that would drive me crazy (poor keyboard, flimsy design).
BTW, my biggest concern with Gateway is whether they will be around in 3 years to support it.