Yes, it most certainly is. 64-bit drivers are available for all supported Windows versions (Windows XP through Windows 7).
This message was posted on behalf of Intel Corporation
Yes it supports 64-bit OS, it is compatible with Windows® 7, vista and XP; drivers are available, but support is limited due to discontinuance of board or OS on Windows® 7.
Supported Operating Systems for Intel® Desktop Boards
If there is anything else you need, please let me know.