AnandTech: nForce4 SLI Roundup: Painful and Rewarding

Firewire and USB Performance

It is really difficult to put together a simple, repeatable, and consistent test to measure USB and Firewire Performance. Since our goal was to make this a standard part of motherboard testing, we needed a benchmark that was reasonably simple to run and that would also provide consistent results on the same test bed. We finally determined that an external USB 2.0, Firewire 400, and Firewire 800 hard disk might be a sensible way to look at USB and Firewire throughput.

Our first efforts at testing with an IDE or SATA drive as the "server" yielded very inconsistent results, since Windows XP sets up cache schemes to improve performance. Finally, we decided to try a RAM disk as our "server", since memory removed almost all overhead from the serving end. We also managed to turn off disk caching on the USB and Firewire side by setting up the drives for "quick disconnect" and our results were then consistent over many test runs.

We used just 1GB of fast 2-2-2 system memory set up as a 450MB RAM disk and 550MB of system memory. Our stock file was the SPECviewPerf install file, which is 432,533,504 bytes. After copying this file to our RAM disk, we recorded the time to write from the RAM disk to our external USB 2.0 or Firewire 400 or Firewire 800 drive using a Windows timing program written for AnandTech by our own Jason Clark. The copy times in seconds were then converted into Megabits per second (Mb) to provide a convenient means of comparing throughput. Higher Rates therefore mean better performance.

Firewire & USB Performance

Possibly the most striking finding in our Firewire and USB throughput tests is the performance of a hard drive connected to Firewire 800. Gigabyte is the only SLI board to feature Firewire 800, and they have used Firewire 1394b on their top boards for almost a year. If you wonder why Firewire 800 matters, just look at the data. Our benchmarks show Firewire 800 at 40% to 55% faster than a drive connected to the more common Firewire 400, and about 16% faster than USB 2.0. The Firewire 800 drive even approaches performance of the IDE drive on the nVidia controller.

Our test is just one of many throughput tests, but in this benchmark, it is clear that the VIA Firewire 400 is faster than TI's 1394a chip.

All of the SATA solutions also slightly outperform IDE in our timed copy from RAM disk. We did not have SATA 2 drives to test with the onboard nVidia SATA2 or the MSI Sil3132, but it is still interesting that throughput with a SATA 1 drive is still a bit faster on the SATA 2 controllers than on SATA 1. We are looking forward to testing the SATA 2 controllers with true SATA 2 drives, which should begin appearing in the next few weeks.