As with life, not all computer transactions are created
equal. SiS is a bit vague describing Specific Stream with Prioritized
but it seems
with the HyperStreaming, the data that is most critical to the system will
be computed first while less essential data will have to wait. For instance SiS claims
that HyperStreaming will give access higher access to high bandwidth, low
latency programs such as video/audio (which can suffer sync problems) and
transactions are tagged with an isochronous bit and then get to pass through the isochronous channel while
the rest of the non essential transactions like keyboard strokes, printer commands and mouse movements
run through the non isochronous channel.
Think of it
as an express highway with its own exit points. The express data doesn't run any faster than
the collectors (non iso), but as it's less congested, the pieces of data end up
getting to their final destination faster.
When HyperStreaming begins to work with another
architecture based on different protocols, efficiency and transition between the
two becomes very important in order to avoid redundancy. The first part of Smart
Stream is Intelligent Arbitration. This feature prioritizes streams according to
their data types and readies the data to be sent.
Non-post and response request are
higher up on the food chain than Post requests because non-post and response
requests use more aggressive insurances and directly reduce the wait state of the
processor and other devices.
allows for a higher cache hit rate and
if that fails system memory hit rate is also much higher. HyperStreaming allows
for two levels of intelligent arbitration to schedule commands and data, and improves
bus utilization and efficiency.
Smart Flow Control is used to improve
transfer rates between the processor and chipsets/devices. With HyperStreaming,
no matter how complex the commands are they only use one cache line. There is
more to HyperStreaming than the basics we've touched upon, but
that is beyond the scope of this article. Up
next, we take a look at the GA-8S655FX Ultra's BIOS and overclocking features.
Overclocking the GA-8S655FX
frank, SiS chipset-based motherboards have never really been the best overclockers in the
past, and so expectations weren't especially high for the Gigabyte GA-8S655FX Ultra.
mediocre voltage options at hand, we were not able to overclock the
motherboard even 1 MHz FSB higher. If we did the system would hang during the 3D
intensive benchmarks such as 3DMark, Quake III Arena or UT2003.
SiS is trying to get themselves settled in the mainstream market before moving
over to the enthusiasts. At any rate, the board is still plenty good
at stock speeds, as you're about to see for yourself.