OK, I measured my temps at full load on the back chips that correspond to your pictures above #3 - #5, where youre showing 100 - 113C temps.
All but the bottom chip are covered by my 92mm fan. The temp measurement on that chip never got above 45C. The other chips should be just as cool or cooler. Thats a shocking 68C less than your max temp on those chips. eek.gif
OK, I got my new Arctic Cooling 92mm F9pwmPST fan mounted on the back to give the 10year old 92mm fan there a rest. The old fan @ 7volts was putting out I estimate 15 - 20 CFMs while the new one is 43 cfm and is just as quiet. I also mounted it using rubber washers, so its 1/4" further from the back of the mobo than it was. My socket temp went down another 1C while my core temps remained about the same. But the big surprise was that at full load on the back chips that correspond to your pictures above #3 - #5, where youre showing 100 - 113C temps, the max temp I measured was 35C. So the higher cfm fans really help those.
The fan that was running on the back @7v for 10 years is an Adda model AD0912MS-A70GL, 12v/.27amp. Its a sleeve bearing and also 43 cfm at 12 volts. http://www.mouser.com/ProductDetail/ADDA/AD0912MS-A70GL/?qs=visfh753kvWlSSklv2jXOw==
It still doesnt rattle or anything, so Ill give it a good cleaning and oiling and put back into service somewhere.
Jeez, if a sleeve bearing fan can last 10 years in use, a Fluid Dynamic bearing one should last 20.