Can I lower CPU Fan setting w/ these temps?

My CPU fan is kind of loud and I was wondering if it's safe to lower the fan RPM in BIOS. This is info I got from the BIOS:

Intel Celeron Processor G530 2M Cache, 2.40 GHz

CPU Temp: 40C
Sys Temp: 26C
Fan Speed: 2000 RPM
CPU Vcore Voltage: 1.192V
CPU IO Voltage: 1.048V
DRam: 1.488V
GPU Volt: 0.45V
3.3V: 3.408V
5V: 5.129V
12V: 12.32V

When I ran Prime95 blend test for 1.5 hours, the CPU temp was ~50C using Core Temp and RealTemp.

MemTest86+ worked fine.

If it's safe to lower the fan, is there a target temperature I want to reach? I want to lower the fan as low as possible since noises really bother me.
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More about lower setting temps
  1. You can always replace your fans without quieter and more efficient fans. But before you do that lower your fan speed to what you think is desirable and run prime again to see what the temperatures max out at.
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