Which of these 2 Motherboards/Rigs,for Windows Server 2008 Standard?

Hello,
I have the following 2 PCs that only differ in the Motherboard:

Intel Core 2 Duo E7300 @ 2.66GHZ 3MB Cache
2GB DDR-800 MHZ
320GB Western Digital WD3200AAKS HD 16MB Cache, SATA II, 7200RPM
GeForce 8400 GS 256MB VRAM
M/B: GIGABYTE GA-P35-DS3L/S3L Intel P35 + ICH9 Chipset (All Solid Capacitor Design)

Intel Core 2 Duo E7300 @ 2.66GHZ 3MB Cache
2GB DDR-800 MHZ
320GB Western Digital WD3200AAKS HD 16MB Cache, SATA II, 7200RPM
GeForce 8400 GS 256MB VRAM
M/B: GIGABYTE GA-EP31-DS3L Intel P31 + ICH7 Chipset

So, which of the two would be the best choice to install Windows Server 2008 Standard and how well would it perform on the above mentioned specs (CPU, RAM, GPU & HD)?
It will be the main Server for Active Directory / Domain Controller, DNS, DHCP, and File Sharing, in a Network Domain of 20 PCs.

P.S.
What's this (All Solid Capacitor Design) reference for the GA-P35-DS3L/S3L Intel P35 + ICH9 Chipset M/B?
Does it mean that it has better capacitors and that it will last much longer?
If that’s the case, it might be the better choice, as this server will be continuously working all day and night non stop.

Thanks in advance

Given a choice between the two. The first one. Better chipset, and electrical regulation.

All solid capacitors will not leak like electrolyte capacitors and can withstand higher temperatures too. Also IIRC the P35 should have better I/O performance than the P31 so I would go for your first setup.

Thanks for the replies & info guys!

Also, how well would Windows 2008 Server Standard perform on the 1st P35 Rig, with the mentioned specs? (CPU, RAM, GPU & HD)

Thanks in advance.

Sufficiently well for you not to worry about it!

Thanks for the Help!