The RAM "Dominator Titanium RGB (2 x 32GB, 6600 MHz, DDR5-RAM, DIMM)" from Corsair is basically compatible with the AMD Ryzen 9 9800X3D, as it uses DDR5 RAM, which is supported by the Ryzen series. However, it is important to check the motherboard compatibility as not all motherboards support the same clock rates. The motherboard should support AMD EXPO or similar technologies to utilise the full performance capabilities of the RAM. It is advisable to check the QVL list of the motherboard to ensure that the RAM will work correctly.