ASRock H61M-DG3/USB3 User Manual - Page 9

Caution - cpu support

Page 9 highlights

CAUTION! 1. Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® 7 / VistaTM / XP. For Windows® OS with 64-bit CPU, there is no such limitation. You can use ASRock XFast RAM to utilize the memory that Windows® cannot use. 2. ASRock XFast RAM is not supported by Microsoft® Windows® XP / XP 64-bit. 9

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9
CAUTION!
1.
Due to the operating system limitation, the actual memory size
may be less than 4GB for the reservation for system usage
under Windows
®
7 / Vista
TM
/ XP. For Windows
®
OS with 64-bit
CPU, there is no such limitation. You can use ASRock XFast
RAM to utilize the memory that Win
dows
®
cannot use.
2.
ASRock XFast RAM is not supported by Microsoft
®
Windows
®
XP / XP 64-bit.