Its a bit more challenging than that too - because you really benefit most when you up the bandwidth of all system connections and choke points, including local hard drive controllers - so suddenly to get full benefit you are adding solid state drives or RAIDed local storage and or high speed Network Attached Storage (NAS) with appropriate redundancy and resilience - all cost inflating.
Nowadays upgrades can tend to cascade - change one thing and you end up upgrading six things to re-balance your technology components effectively!
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