iMac 27" Late 2013 Fan speed went up after CPU upgrade

[ABCDEFGHIJKLMNOPQRSTVWXYZ]

I upgraded from an i5-4670 to an i7-4771 and reapplied thermal paste and everything seems to be working fine except now the fan speed is up. using mac fan control, i usually sat at 1200 rpm with the old cpu, but now, it sits at about 1700 rpm. what is causing this?

 

[cynics]

If temps look normal, reset SMC.

If temps look higher than expected, check activity monitor CPU. Depending on your install spotlight could be reindexing and other processes running. I would wait for spotlight, if its something else, reset SMC.

Might as well reset NVRAM as well.

 

[ABCDEFGHIJKLMNOPQRSTVWXYZ]

Resetting SMC and NVRAM didn't change the fan speeds. I put the i5-4670 back into the system and the fan is still running about 1700 rpm. The CPU was the only upgrade I made, so I am not sure what is causing the fan to run louder than normal. I used Kyronaut the CPU and GPU, and Arctic thermal pad 1.5mm for the VRAM. I often read about how if the temperature sensor isn't working, the fan will go full speed, but my fans aren't going full speed, it's going 1700/2640, so I am not sure what is going on.

Here are my temperatures from Macs Fan Control 1.4.12 (iMac14,2)

1 Fan named Main (Min/Current/Max RPM -> 1200-1700ish-2640), Control = Auto

Sensor and Temperature in C:
Ambient 29
CPU Core 1 30
CPU Core 2 29
CPU Core 3 27
CPU Core 4 31
CPU PECI 36
CPU Proximity 34
DIMM Module 1 Proximity 32
DIMM Module 2 Proximity 28
DIMM Module 3 Proximity 30
DIMM Module 4 Proximity 31
GPU Diode 30
GPU PECI 35
GPU Proximity 33
LCD Proximity 2 31
LCD Proximity 29
Platform Controller Hub Die 36
APPLE SSD SD0128F 31
APPLE HDD ST1000DM003 30


My computer specs:
iMac(14,2) 27" Late 2013
i7-4771
GTX 780M
32GB RAM
1.125TB Fusion Drive (1TB HDD + 128GB SSD)
Mac OS 10.14.4