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Overclocking
The motherboard
is targeted to low cost market, but the SiS 648 chipset capabilities
recommend GA-8SG667 for overclocking activities. The motherboard
is suitable for overclocking because there are no additional devices
onboard which can cause problems with high clocks. Although the
motherboard is designed to work unofficially with 400Mhz DDR modules,
I was pretty confident about the overclocking capabilities of the
SiS 648 chipset.
The
most important settings which influence overclocking success
can be found in BIOS. The CPU clock can be tweaked between
100 Mhz and 355Mhz and the DDR clock between 200Mhz, 333Mhz
and 400Mhz.
These are the most important BIOS features which permit you
to overclock the motherboard, but they are not the only ones.
Additionally,
for increased control you can adjust the AGP and the PCI clocks;
keeping these clocks around the standard values is the best
choice. Unfortunately you are not able to tweak CPU or DDR
voltages. That’s quite sad because without a voltage
raise chances to overclock in a high degree are quite low.
In BIOS there is also an option called “Top Performance”
which suggests better results in benchmarks. That’s
half true, the Top Performance option optimizes the memory
controller settings for the best stable settings. |
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We had a very
pleasant overclocking experience with GA-8SG667. Although the voltage
tweaking features are nonexistent, I succeeded to overclock a Pentium
4 2.4Ghz up to 149Mhz FSB. The highest memory clock I got was 420Mhz
with two banks filled with Corsair PC 3200DDR.
GA-8SG667 survived
to over 120 hours of torture with a CPU clock of 2.68Mhz and a memory
clock of 333Mhz. All slots were filled with memory modules in these
tests. |
00:21 
Tagan TG480-U01 480W ATX / EPS Power Supply Review 
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