CrystalDiskMark is a small benchmark utility for drives and enables rapid measurement of sequential and random read/write speeds. Note that CDM only supports Native Command Queuing (NCQ) with a queue depth of 32 (as noted) for the last listed benchmark score. This can skew some results in favor of controllers that also do not support NCQ.
The SATA III 6Gbps performance testing was completed using a Corsair Neutron 240Gb SSD.
Benchmark Results: The GIGABYTE X99-UD4P was able to hit an average of 508.8MB/s read and 436.7MB/s write in CrystalDiskMark. It is a touch slower than the ASUS X99-Deluxe, which averaged 522.3MB/s read and 440.6MB/s write.
Benchmark Results: The GIGABYTE X99-UD4P was able to edge out the ASUS X99-Deluxe with 546.59MB/s for the 4MB Read and 461.68MB/s on the 4MB Write test. The ASUS was just behind with an 4MB read of 545.35MB/s and a 4MB Write of 460.55MB/s.