N2U400-A v1.x maximum CPU and HDD supported information as below,
HDD:400G
CPU: AMD Duron 200Mhz FSB CPU - 950 AMD Duron 266Mhz FSB CPU - 1800
          AMD Morgan 200Mhz FSB CPU - 1.4G
          AMD Athlon 200Mhz FSB CPU - 1.4G AMD Athlon 266Mhz FSB CPU - 1.4G
          AMD Palomino 266Mhz FSB CPU - 2100+
          AMD Athlon XP (0.18u) 266Mhz FSB CPU - 2100+ AMD Athlon XP (0.13u) 266Mhz FSB CPU - 2600+ 
          AMD Athlon XP (0.13u) 333Mhz FSB CPU - 3000+ AMD Athlon XP (0.13u) 400Mhz FSB CPU - 3200+
          AMD Sempron 333Mhz FSB CPU - 2800+

The N2U400-A v1.0 supports 8X ATI 9200 SE 128MB AGP card & it is also backward compatible with 4x AGP card. But the AGP slot is keyed to support only the latest 1.5-volt AGP cards.

附件是 N2U400-A V1.0最新BIOS. 它能支持内存双通道。
此外，这个主板的标准BIOS都支持内存双通道功能。

• get_app Download Link

请更新BIOS为N2B19.BIN 或更新版本解决。

• get_app Download Link

N2U400-A V1.0U只支持AGP 3.0(8X AGP)显卡，不支持AGP 2.0(2X/4X)显卡.