How to more accurately determine which PC component can affect the dead hang?

Question

Iron

Hello, for quite a long time there has been a problem with the PC, namely a random freeze (mainly in games), it is "revived" only by the physical reset button. I thought it was in the video card (there was an old HD 7770), I changed it to a new, relatively fresh RX 560, the freezes remained (it even felt more frequent), in the direction of which it is worth starting to dig further?
Operating system Microsoft Windows 10 Pro
CPU type HexaCore AMD FX-6300, 3817 MHz (19 x 201)
Motherboard Asus M5A78L-M LX (1 PCI, 2 PCI-E x1, 1 PCI-E x16, 2 DDR3 DIMMs, Audio, Video, Gigabit LAN)
DIMM1: Kingston 99P5471-013.A00LF 4 GB DDR3-1600
DIMM2: Kingrock 1600 4GB 4 GB DDR3-1600
Disk Drive ST1000DM003-1ER162 ATA Device (1 TB, 7200 RPM, SATA-III)
Power Supply DNS FinePower DNP-450 400W
Drivers on the video card of the latest version, BIOS too, Windows updated.

Answer 1

Throw another PSU.
And so there are about as many options as there are components in the system unit.
1. overheating of the processor
2. problems with the socket - blade / no contact (when heated, it climbs out).
3. power problems (PSU)
4. any of the PWM on the motherboard
5. you can fantasize for a long time
at home, this is diagnosed by replacement, as an option, you can perform load tests on individual components - drive memory with a memtest, vidyukha with graphic tests, etc.
The main thing is that the software should be narrow and load one of the components and not the entire system.

Answer 2

Standard sequence: overheating - RAM - Axis - power supply - motherboard - everything else.