My Dell has pretty good specs. It's an I-7 8700 CPU @ 3.20 GHz 6 core with 32.0 GB of ram
So my machine is an I7-8700 running on an ASUS Prime H370-Plus micro ATX motherboard. 32 GB (2x16GB) DDR4 3000 memory. EVGA 550W PS. EVGA GTX1050 Ti graphics card. Additional NIC on a PCI card. Cooling is a Corsair H100i cooler. 'C' drive is a M.2 256GB PCI-E by Intel. A WD 500GB Blue SSD for JPGs and such. Main video storage disks are three WD 10TB Purple drives spinning at 7200rpm. Besides the CPU cooling fans, there are 6 additional case fans.
I am running a total of 18 cams, 4 x 4MP and 14 x 2MP at the highest bitrates allowed, 15 FPS. Continuous recording 24/7 direct to disk in BI, all using NVidia CUDA Hardware Accelerated Decode, and I am not using substreams.
The numbers are: 11,500kB/s, 675MP/s, CPU 26%, GPU 40%, Memory 31%, and the IP cam NIC card is running at 85 Mbps. The PC pulls 107 Watts.
The only thing running on this PC besides BI is the NTP service and Norton.
My system NEVER throttles for heat. The CPU never gets above 49C (120F). The fans are always running slow. The power supply fan has an eco mode where it only runs if it is needed. It has never turned on.
Something is wrong with your server if it is having heat problems with such a small load.