Gigabyte GA-X79-UD3 Review

USB Speed

For this benchmark, we run CrystalDiskMark to determine the ideal sequential read and write speeds for the USB port using our 64GB Patriot SuperSpeed USB 3.0 drive.  Then we transfer a set size of files from the SSD to the USB drive, and monitor the time taken to transfer.  The files transferred are a 1.52 GB set of 2867 files across 320 folders – 95% of these files are small typical website files, and the rest (90% of the size) are the videos used in the Sorenson Squeeze test. 

By default, one of the Gigabyte's best showings is in the USB 2.0 tests.  It comprehensively is ahead, especially in the USB copy test.  Unfortunately, with my USB 3.0 device and the Gigabyte's USB 3.0 Fresco controller, there were compatibility issues preventing any USB 3.0 testing.  Should we get a driver update, we will update the graphs.

SATA Testing

We also use CrystalDiskMark for SATA port testing.  The operating system is installed on the SSD, and the sequential test is run at the 5 x 1000 MB level.  This test probes the efficiency of the data delivery system between the chipset and the drive, or in the case of additional SATA ports provided by a third party controller, the efficiency between the controller, the chipset and the drive.

SATA testing of the PCH ports reveals nothing special, with the Gigabyte UD3 being in the middle of the road on average.

DPC Latency

Deferred Procedure Call latency is a way in which Windows handles interrupt servicing.  In order to wait for a processor to acknowledge the request, the system will queue all interrupt requests by priority.  Critical interrupts will be handled as soon as possible, whereas lesser priority requests, such as audio, will be further down the line.  So if the audio device requires data, it will have to wait until the request is processed before the buffer is filled.  If the device drivers of higher priority components in a system are poorly implemented, this can cause delays in request scheduling and process time, resulting in an empty audio buffer – this leads to characteristic audible pauses, pops and clicks.  Having a bigger buffer and correctly implemented system drivers obviously helps in this regard.  The DPC latency checker measures how much time is processing DPCs from driver invocation – the lower the value will result in better audio transfer at smaller buffer sizes.  Results are measured in microseconds and taken as the peak latency while cycling through a series of short HD videos - under 500 microseconds usually gets the green light, but the lower the better.

By far one of the best results we had with the Gigabyte board is the DPC testing, where it beat our previous best (an ASUS P8P67) by 25+ microseconds.  Getting a score of 70 microseconds is indicative of very clever driver and BIOS programming.  However, as with many boards we've seen for X79, to get this result, any voltage/fan monitoring software must be turned off - in this case, EasyTune6.