Is This a Good First Gaming and Recording PC for 1440p?

The build is broadly compatible, but there are a few things worth checking. If a boxed 7800X3D is unavailable, the tray version may be the practical choice, though you should confirm exactly what warranty the retailer provides. For memory, DDR5-6000 would usually be a better target for this platform if you can find it at a sensible price; the brand matters less than the speed, timings, and having a matched 2x16GB kit. Also check the exact specifications of the MSI B850 Gaming Plus WiFi6E. That version may not include the same PCIe 5.0 graphics-slot support as the standard WiFi model, so don’t assume the two boards differ only in wireless features. If a B650 board is unavailable or costs more locally, the B850 board can still be perfectly usable, but verify its expansion-slot layout and pricing. The Samsung SSD should work, although other reputable 1TB NVMe drives may offer similar real-world performance for less. The AK620 is sufficient for the 7800X3D, and the case with two front intake fans should provide decent airflow. Just make sure the motherboard supports the processor with its installed BIOS version and confirm the graphics card fits comfortably in the case.

The parts should generally work together, but I’d lean toward an 850W power supply if the price difference is reasonable. A good 750W unit can run this system because the 7800X3D is relatively efficient, but 850W gives you more headroom for transient spikes and future upgrades. An ASUS TUF 850W Gold model should be a reasonable choice as long as it is a genuine, current model with the proper modern GPU power connector and protections.