MacPro Temps OK?

Have seen several discussions in the Apple Support communities  on high temps causing problems.
These Fahrenheit temps were taken at 'idle' with "Temperature Monitor" App v 4.96, on my MacPro 1,1 - Mac OS X (10.6.8), 8 MgRam,1-120G SSD,1-500G,1-Ext250G.
Am wondering if my idle temps are OK, or do I need to do some dust cleaning? Am not a gamer, video, graphics, or audio power user. Mostly Excel, Word, Web, and email.
75℉
Ambient Air
93℉
CPU A Heatsink
100℉
CPU A Proximity
91℉
CPU B Heatsink
97℉
Expansion Slots
81℉
Hard Drive Bay 1
82℉
Hard Drive Bay 2
81℉
Hard Drive Bay 3
82℉
Hard Drive Bay 4
111℉
Memory Bank A Point 1
131℉
Memory Bank A Point 2
120℉
Memory Bank A Point 3
108℉
Memory Bank B Point 1
124℉
Memory Bank B Point 2
129℉
Memory Bank B Point 3
172℉
Memory Module A1
176℉
Memory Module A2
158℉
Memory Module A3
140℉
Memory Module A4
160℉
Memory Module B1
174℉
Memory Module B2
158℉
Memory Module B3
149℉
Memory Module B4
176℉
Northbridge Heat Sink
118℉
Power Supply Location 1
115℉
Power Supply Location 2
99℉
SMART Disk Hitachi HDS725050KLA360 (KRVN27ZAKE8LNH)
86℉
SMART Disk OWC Mercury Electra 3G SSD (EX3G2012E22K7159)
91℉
CPU Core 1
88℉
CPU Core 2
84℉
CPU Core 3
84℉
CPU Core 4

john from palm harbor wrote:
...However, I'm wondering if running the fans at 1500 rpm default poses a potential risk of significantly shortened fan life?... ...This whole thing about heat is new to me. Have never dealt with it, even back in the day (1984) with my Mac 512 ($2800!).
Back in the day (1985), I couldn't deal with heat in my Mac 512 except to ensure that nobody put a book on top, which would block most of the vents (back then a friend, for whom I'd installed a video card and an external monitor on an SE/30 covered the SE/30 with a plastic bag to keep the dust out since she wasn't using the internal monitor any more).
What I've done with smcFanControl is to set up 6 different combinations of fans speeds for different usage scenarios and then periodically glance at the temperature in the menu bar. If it's going up, I'll just enable a faster fan combination. That way, if the room is cool and the Mac is loafing, I can keep the fans at a low speed, but if I'm processing a series of RAW image files using software which will assign as many images to process at once as there are cores to process them (the 2010 6 core will show 1100+% CPU usage when that's happening), I'll start with a higher fan speed set and go even higher if there's need to.

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