i have an xfx 7950 double D black edition it can get loud when a 100% fan speed but it rarely goes over 60-70% fan speed for me thats after about 1-2 hours of battle field and my case has the worst airflow i only have one fan in it so the gpu isn't really getting much air so keep that in mind
i think the tn panel has an 6 bit panel while the ips/pls and other higher quality panels have a 8,10,12 bit colours, the tn panel will try to reproduce the colours by blending two colours