MSI B450M MORTAR MAX Motherboard mATX, AM4, DDR4, LAN, USB 3.2 Gen2, TYPE-C, M.2, Mystic Light Sync, HDMI, Display Port, AMD RYZEN 1st, 2nd and 3rd Gen Ready

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I don't see why you should be worried about worse performance. That should not be the case unless Windows is overflowing with gunk/half corrupt, or MSI somehow borked the specific BIOS revision you flashed. Do a clean install if you haven't in a while, make sure you get the latest chipset drivers, and be on a reasonably recent BIOS. Do a few simple benchmarks and if performance is roughly in the right place then there's nothing to worry about (e.g. 650/9500 CPU-Z, 1600/21k R23 etc) x DisplayPort, support a maximum resolution of 4096x2304 @60Hz, 2560x1600 @60Hz, 3840x2160 @60Hz, 1920x1200 @60Hz

Military style with Extended heatsink design for better thermal solution, DDR4 Boost, Core Boost, Turbo M.2 and USB 3.2 Gen2 connector Supports PCIe 3.0 x4 (1st, 2nd and 3rd Gen AMD Ryzen/ Ryzen with Radeon Vega Graphics and 2nd Gen AMD Phillips 32 32M1N5800A (4k144), LG 32" (4K60) | Gigabyte G32QC (2k165) | Phillips 328m6fjrmb (2K144) Core Boost: With premium layout and fully digital power design to support more cores and provide better performance.

MSI B450M MORTAR MAX Military Style AMD M-ATX Gaming Motherboard (Global)

Ryzen with Radeon Graphics) or PCIe 3.0 x2 (AMD Athlon with Radeon Vega Graphics)and SATA 6Gb/s 2242/

You can always upgrade your GPU further down the road and this will upgrade your gaming experience more than any CPU or 32GB RAM will. Military style with Extended heatsink design for better thermal solution, Intel LAN, Intel CNVi ready, Core Boost, DDR4 Boost, Core Boost, Twin Turbo M.2 and USB 3.1 Gen2 connector Ports 1x M.2 PCIe 3.0 x4 32Gbps/SATA 6Gbps up to 2280, 1 x M.2 PCIe 2.0 x4 16Gbps up to 2280, 4 x SATA 6Gbps, 1 x USB 3.1 Type-A, 1 x USB 3.1 Type-C, 6 x USB 3.0 (2 via headers), 6 x USB 2.0 (4 via headers), 1 x LAN, audio out, line in, mic, Optical S/PDIF out That CPU cooler may be a problem, most AIO's only last 2-3 years before they start losing performance or just outright die - the 5700x for example would easily be cooled on a basic 120mm tower cooler, while the 5900x needs a larger one or another AIOI'm not confident an aging AIO designed pre-AM4 would keep a 5900x in the happy temp ranges for max boosting) is the better gaming choice with the single CCX design, the 5900x is better if you have multi threaded workloads or need the extra cache for something Consider going 4x8GB of that RAM if you can, as you tend to get an extra 10% CPU performance in a lot of game titles from four memory ranks on zen 3. The 5700X will be much easier to cool with your cooler. Unless you want to upgrade cooling too go for 5700X.