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My little brother was in need of a desktop computer so I decided to get a used Dell OptiPlex 9020 MT on the cheap off eBay and upgrade it. In this video I will gut the unit and install a better CPU, upgrade the PSU to one that won't explode, upgrade the GPU, upgrade to an SSD, and max out the RAM. These machines can make pretty decent units when you upgrade them.
Specs
Dell OptiPlex 9020
Intel Core i7-4790K
MSI Ventus XS OC GTX 1660 Ti
32GB RAM
Samsung 860 Pro 1TB
Seasonic Prime Platinum 550W PSU
10Gbps Fiber NIC (Mellanox Connect-X 2)