My current PC is about 9 years old and it's time for me to upgrade. I really don't know much about building a PC. It would be very nice to get some insight from experienced people on a build I've chosen before I lock into anything.
Primary Use: Gaming
CPU: Ryzen 7, 7800x3d
Motherboard: MSI B650 MAG Tomahawk WiFi
RAM: No idea, how to choose the correct RAM sooo... Corsair Vengeance LPX 64gb (2X32)
Graphics Card: AMD Radeon RX 7800 XT
SSD: 980 Pro SSD 2TB M.2/NVMe
Power Supply: Corsair RM850 Watt ATX
Heatsink: DeepCool AK400 Performance CPU Cooler + Lian Li Unifan P28 Fluid Dynamic Bearing 120mm case fan 3 pack
Thermal Compound: Does brand matter?
Case: The seemingly ever so common Corsair 4000D Airflow
Is there something here you would change? Is the RAM compatible? Is the cooling sufficient? Would you change the motherboard? Please, share your thoughts. Thanks!
Can you provide links to the items you were looking at or a build list from https://www.microcenter.com/site/content/custom-pc-builder.aspx
Based on the general idea of parts you have listed, it all looks fine, you'd want to verify for the RAM if you have an AM5 motherboard picked out that you are selecting DDR5 RAM.
The 7800X3D may be a bit hot for the AK400, please consider the AS500 or AK620 models instead. You might get by on the 400 but it's better to have a little too much cooling power than not enough. At your budget level I think you should not skimp on the cooler.
Most coolers come with pre-applied paste. You should ask at the store when picking it up if that's the case with the Deep Cool brand. I think they do but don't rely on that.
As already mentioned, make sure you get DDR5 type memory.
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