How is this "equivalent?"<p>The Xeon E5 in the Pro is faster and costs at least $100 more. I'm not sure how these motherboards compare in quality. The ECC memory memory in the Pro is faster and more reliable. This also doesn't have Thunderbolt, onboard WiFi, or Bluetooth 4.<p>Last, this is big, loud, and hideous.<p>If the point was, "you can build an equivalent computer for $1000 less," it misses the point, widely.
This build is conservative when picking a R9 280X, because the performance level of AMD Firepro D300 (dual) is currently unknown.
You can always drop in R9 290X (or two...)