Complex sentence: The goal is to purchase CPU generations that offer the best performance per dollar, not absolute performance, how this is measured is unclear but is likely to incorporate running costs of the entire server and CPU power consumption could be significant factor.
Split into simpler sentences: The goal is to purchase CPU generations that offer the best performance per dollar, not absolute performance. How this is measured is unclear but is likely to incorporate running costs of the entire server and CPU power consumption could be significant factor.