I noticed I had some extra DDR3 memory laying around in an unused broken PC, and decided to upgrade one of my Optiplex 7010 machines from 8GB to 12GB. That all went fine and well, but while running the diagnostic tests on memory, I surely noticed that the CPU fan was dipping slightly below the 1000rpm. I also noticed that the max value was pretty low. I did have some issues with this Optiplex being slower than the other one (identical model) and noticed the CPU temp on this one hovering in lower 50's in the diagnostic screens. The other Optiplex has an Antec PSU and 24GB RAM, bu, otherwise, it's the same machine as this one. I keep wondering if the low fan RPM's are a perfectly normal occurrence, or if this is leading to the CPU running a bit hot. Also, when I run the CPUID HW Monitor, all the core temps look reasonable (30's to early 40's).

I don't think I am going to go and replace the CPU fan just yet before I am sure this is not some other issue, but in case I decide to, would this fan/heatsink work? If not, can you suggest any other ones? I do sort of believe that after 6-7 years of non-stop spinning, some of these fans are bound to fail anyway, sooner rather than later.

https://www.amazon.com/dp/B002RWJGI6/?coliid=I2ONQ1KN8IN0M3&colid=37WVFPNV9BCBN&psc=1&ref_=lv_ov_lig_dp_it