Why should C-level execs care about what model processor is used in their computers? Office users aren't looking for the absolute greatest performance, they're looking for reliability, manageability, and cost. I can guarantee that no typical* medium or large size business will make a decision on which vendor to use for office computers based on the performance benchmarks. Frankly, who gives a shit about the motherboard in a typical office user's computer. It doesn't matter, certainly not to upper management. Choose something that has a reasonable cost, a solid long term support contract, and is easy to manage in your existing environment. If anything, the support contract, expandability (adding dual monitors later, or adding more memory for heavy data analysts or future software upgrades), and the existing vendor relationships are far more important than performance benchmarks.
*Assuming they're not using them to render lots of graphics or do other very specific, specialized tasks.