Adding an SSD is the best upgrade for an old PC to improve performance
GIGABYTE M30 SSD 1TB Key Features | SSD - GIGABYTE Global
Amazon.com: Western Digital 1TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS100T2B0A : Electronics
Amazon.com: Gigabyte Gen3 2500E SSD 1TB NVMe M.2 Internal Solid State Hard Drive with Read Speed Up to 2400MB/s, Write Speed Up to 1800 MB/s, Host Memory Buffer Supported, (G325E1TB) : Electronics
GIGABYTE M30 SSD 1TB Key Features | SSD - GIGABYTE Global
Gigabyte teases AORUS Gen5 SSD 10000 reaching up to 12.5 GB/s sequential read speed - VideoCardz.com