Hardware concept
New hardware is usually cheaper and more efficient than the replacement of individual components of the old system. The installation of good hardware into an old system does not really improve an old computer - "A snail will never be a racehorse!"
Hardware is never an asset! Each computer part is outdated in a relatively short time. It is therefore important to use our computer as wisely and efficiently as possible, as you may otherwise not cover your costs.
Costs alone are not decisive for buying the right computer system! What use is a cheap computer system that does not meet your requirements? Stability and compatibility are the most important factors to be profitable in the complex world of data processing.