http://www.gigabyte-usa.com/MotherBoard/News/News_610.htm
All GIGABYTE AMD K8-socket 939/ K8-socket 754 and Intel® Pentium® 4-socket 775 solutions are ready for next generation 64-bit computing applications. Dedicated to delivering best-of-class motherboards for desktop PC systems, GIGABYTE provides complete support for 64-bit computing with the latest Intel and AMD solutions.
The boost in performance provided by 64-bit computing offers tangible advantages for today's most demanding applications such as engineering design programs or digital content creation and management. Systems with 64-bit architecture that are running applications that have been developed to take advantage of 64-bit technology enjoy substantially increased physical memory support with drastically reduced memory accessing time.
Naturally, all GIGABYTE products that are 64-bit ready are also compatible with 32-bit applications, affording users full compatibility with existing applications together with higher performance when used with a processor and operating system that is 64-bit ready.
The table below contains a complete list for 64-bit computing supported GIGABYTE products.
Drivers with 64-bit support are available from the download center on the GIGABYTE website as well as the diver CDs that are included in motherboard packages.
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AMD 64 3400+ @ 2.33Ghz
Radeon X800 XT
1 GB Corsair TwinX DDR400
Asus K8T800 w/Via 4.51 drivers
160GB SATA Maxtor
200GB ATA Western Digital
Swiftech liquid Cooling system

