Based on the given link, the Gigatron Prime Pro Guardian features an Intel Core i5-10400F processor, 16GB DDR4 RAM, NVIDIA GeForce GTX 1660 SUPER 6GB graphic card, and a 480GB SSD. Both The Witcher 3: Wild Hunt and ARK: Survival Evolved should be playable on this configuration, but the performance would depend on the graphical settings you choose. For The Witcher 3: Wild Hunt, you can expect to run the game comfortably at medium to high settings at 1080p resolution with stable frame rates of 60 FPS or more. For ARK: Survival Evolved, you can run the game at medium settings with a 1080p resolution, achieving 50-60 FPS. If you desire to play at higher settings or resolutions, you may need to opt for a more powerful GPU. However, the Gigatron Prime Pro Guardian is a capable system for playing these games at decent graphical settings.