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WARNING
Please realize that there is a certain risk involved with overclocking, including adjusting the
setting in the BIOS, applying Untied Overclocking Technology, or using the third-party over-
clocking tools. Overclocking may affect your system stability, or even cause damage to the
components and devices of your system. It should be done at your own risk and expense.
We are not responsible for possible damage caused by overclocking.
CAUTION!
1.
ASRock UCC (Unlock CPU Core) feature simpli es AMD CPU activa-
tion. As long as a simple switch of the UEFI option "ASRock UCC", you
can unlock the extra CPU core to enjoy an instant performance boost.
When UCC feature is enabled, the dual-core or triple-core CPU will boost
to the quad-core CPU, and some CPU, including quad-core CPU, can
also increase L3 cache size up to 6MB, which means you can enjoy the
upgrade CPU performance with a better price. Please be noted that UCC
feature is supported with AM3 CPU only, and in addition, not every AM3
CPU can support this function because some CPU's hidden core may be
malfunctioned.
2.
This motherboard supports Untied Overclocking Technology. Please read
"Untied Overclocking Technology" on page 39 for details.
3.
This motherboard supports Dual Channel Memory Technology. Before
you implement Dual Channel Memory Technology, make sure to read the
installation guide of memory modules on page 14 for proper installation.
4.
Whether 2100MHz memory speed is supported depends on the AM3/
AM3+ CPU you adopt. If you want to adopt DDR3 2100 memory module
on this motherboard, please refer to the memory support list on our web-
site for the compatible memory modules.
ASRock website
http://www.asrock.com
5.
Due to the operating system limitation, the actual memory size may be
less than 4GB for the reservation for system usage under Windows
TM
Vista
/ XP. For Windows
limitation.
6.
For microphone input, this motherboard supports both stereo and mono
modes. For audio output, this motherboard supports 2-channel, 4-chan-
nel, 6-channel, and 8-channel modes. Please check the table on page 3
for proper connection.
7.
ASRock Extreme Tuning Utility (AXTU) is an all-in-one tool to ne-tune
different system functions in a user-friendly interface, which is including
Hardware Monitor, Fan Control, Overclocking, OC DNA and IES. In Hard-
ware Monitor, it shows the major readings of your system. In Fan Control,
it shows the fan speed and temperature for you to adjust. In Overclock-
ing, you are allowed to overclock CPU frequency for optimal system per-
formance. In OC DNA, you can save your OC settings as a pro le and
share with your friends. Your friends then can load the OC pro le to
ASRock 990FX Extreme4 Motherboard
®
64-bit OS with 64-bit CPU, there is no such
®
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