Yep, they are real and they are useful. When data centers upgrade they flood the market with older tech which keeps the price of old xeons pretty low. Data centers care about performance per watt more than anything else and old processors are inefficient. Running one old CPU in your house wont make much of a difference to your power bill, but at datacenter scales that adds up to thousands upon thousands of watts.
Yep, they are real and they are useful. When data centers upgrade they flood the market with older tech which keeps the price of old xeons pretty low. Data centers care about performance per watt more than anything else and old processors are inefficient. Running one old CPU in your house wont make much of a difference to your power bill, but at datacenter scales that adds up to thousands upon thousands of watts.