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CAUTION!
1. ASRock UCC (Unlock CPU Core) feature simplifies AMD CPU
activation. As long as a simple switch of the UEFI option "AS-
Rock 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/AM3+ CPU only, and in addition,
not every AM3/AM3+ CPU can support this function because
some CPU's hidden core may be malfunctioned.
2. Whether 2450/2100MHz memory speed is supported depends
on the AM3/AM3+ CPU you adopt. If you want to adopt DDR3
2450/2100 memory module on this motherboard, please refer
to the memory support list on our website for the compatible
memory modules.
ASRock website: http://www.asrock.com
3. Due to the operating system limitation, the actual memory size
may be less than 4GB for the reservation for system usage un-
®
der Windows
8 / 7 / Vista
bit CPU, there is no such limitation. You can use ASRock XFast
RAM to utilize the memory that
ASRock 990FX Extreme9 Motherboard
TM
®
. For Windows
64-bit OS with 64-
®
Windows
cannot use.
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