I posted a detailed reply here but it got lost and as it's 4:40am I can't re-do it all.
In brief, the 50C plus temps are just bad.

OK, my D945GCLF2 board came with the (latest low-profile Northbridge heatsink fitted with a 40mm x 40mm x 10mm fan made by T&T, ref 4010H12S NF1 0.16A 12VDC. Worked fine for almost two weeks @ 30 - 60 minutes a day ... then went noisy. A slight tap quietened it (I have it fitted to a heavily modifie...