What can cause fps drops?

Question

Iron

FPS began to sag in demanding games, for example, it drops from 80 to 20 for a couple of seconds, then returns to 80 and repeats after 20-30 seconds. It didn't happen before, I reinstalled Windows.

Motherboard
Type CPU OctalCore AMD Ryzen 7 5800X, 4666 MHz (46.75 x 100)
Motherboard ASUSTeK COMPUTER INC. G15DK Motherboard
chipset AMD B550, AMD K19.2 FCH, AMD K19.2 IMC
System memory 16297 MB
DIMM1: SK hynix HMA81GU6DJR8N-XN 8GB DDR4-3200 DDR4 SDRAM (24-22-22-52 @ 1600MHz) (22-22-22-52 @ 1600MHz) (21-21-21-49 @ 1527MHz) (20-20-20-47 @ 1454 MHz) (19-19-19-45 @ 1381 MHz) (18-18-18-42 @ 1309 MHz) (17-17-17-40 @ 1236 MHz) (16 -16-16-38 @ 1163 MHz) (15-15-15-35 @ 1090 MHz) (14-14-14-33 @ 1018 MHz) (13-13-13-31 @ 945 MHz) (12-12 -12-28 @ 872 MHz) (11-11-11-26 @ 800 MHz) (10-10-10-24 @ 727 MHz)
DIMM3: SK hynix HMA81GU6DJR8N-XN 8GB DDR4-3200 DDR4 SDRAM ([email protected]) ([email protected]) ([email protected]) (20-20-20-47 @ 1454 MHz) (19-19-19-45 @ 1381 MHz) (18-18-18-42 @ 1309 MHz) (17-17-17-40 @ 1236 MHz) (16 -16-16-38 @ 1163 MHz) (15-15-15-35 @ 1090 MHz) (14-14-14-33 @ 1018 MHz) (13-13-13-31 @ 945 MHz) (12-12 -12-28 @ 872 MHz) (11-11-11-26 @ 800 MHz) (10-10-10-24 @ 727 MHz)
BIOS type Unknown (05/25/2021)
Communication port Serial port (COM1)

Display
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB)
Radeon (TM) RX 470 Graphics (4 GB
) AMD Radeon RX 470 Accelerator (Polaris 10)
HP 27er Monitor (HDMI1) [27" IPS LCD] (3CM63208LQ)
Monitor Universal PnP Monitor [NoDB] (AWGM41A000691)

Answer 1

power unit?
cooling system? Has the thermal paste been cleaned or replaced recently?
when there is not enough power, for example, a power supply or power circuit on the same video card, some kind of degradation has occurred (if it works at its limit , if the capacitors are swollen, dust has accumulated, etc.), then I observed this behavior, I explain this by a short-term reset of the frequency processor or its local reboot (processors have long been not just a processor, it is a programmable controller whose program is loaded when turned on, why not reset itself for microseconds in case of 'hardware' failures, such as not enough power or overheating, although the latter is throttling , the frequency decreases)