Cheaper alternative are
- BIOSTAR TF720 AM2+ GeForce 8100 and nForce 720a chipset ATX
- GIGABYTE GA-MA78G-DS3H AMD 780G chipset ATX
Processer
I am not sure of the effect of the size of L2 cache for Windows Server.
- Phenom X4 9150e 4 x 512KB L2, 2MB L3, 65W (a bit pricey, $140)
- Phenom X3 8450 3 x 512KB L2, 2MB L3, 95W (+20W than Athlon X2 4850e at idle, $100)
- Phenom X3 8450e 3 x 512KB L2, 2MB L3, 65W (not released yet)