CEONSS

Case: Midi-Tower Sharkoon Rebel 9 Value Edition
PSU: BeQuiet! 450W
Mainboard: Gigabyte
CPU: AMD Phenom II X2 550 @ 3.1 GHz
HDD: 2x250GB WD RAID Edition 3 RAID1
Memory: 2x2GB Corsair 800MHz Dual Channel
Fans: Outlet 2x80mm Papst (plus PSU fan), Inlet 1x120mm Papst, 1x240mm Sharkoon.

Maximum network load ever seen was 3% @ 100MBit/s

The hardware has been replaced. Now the system specs are:
Case Revoltec Sixty2
CPU Intel XEON 3450
4GB Samsung REG-ECC-RAM 1333 MHz
Intel server board S3420 GP LX
2*250GB Western Digital RE3 24/7 RAID 1
Seasonic 500W PSU Green Power
64 Bit OS

The server has been replaced again, but the hardware specs remained almost the same. The differences are: OS, 3xHDD 500GB Western Digital RE4 (2 as RAID1 plus 1 hotspare) and a decent server NIC. Here's a picture:

Update:
The server hardware specs now are:
Case: Revoltec Sixty2
CPU: Intel XEON 1270 (3.4 GHz, Turbo Boost=3.8 GHz)
RAM: 8GB Kingston ECC 1333 MHz
Board: Supermicro X9SCM-F
3*250GB Western Digital RE4 24/7 RAID 1 (1 as hotspare)
PSU: Seasonic 500W Green Power
NIC: Intel Pro PT1000 Server 1 Port (makes 4 (!) NICs: 2 onboard (unused) 1 for remote management, 1 main)
OS: 64 Bit
Fans: 1*Arctic Cooling 12cm outlet case fan, 1*Papst 12cm inlet HDD cooling fan, 1*12cm PSU fan, 1*CPU fan (boxed Intel).
Network: 1GBit/s up and down.

Here are two pics of the 7th ceonss server hardware:

CEONSS#7 specs are:
Case: Chenbro RM12404 19" 1U
CPU: Intel Xeon 1270 (3.4 GHz, Turbo Boost @ 3.8 GHz)
RAM: 8GB Kingston ECC 1333 MHz
Board: Supermicro X9SCM-F
HDD: 3*250GB Western Digital RE3 24/7 RAID 1 (1 of them is running as a spare disk, so that 2 of the 1.2 million hours MTBF HDDs may fail without affecting the server operation )
PSU: Zippy Emacs P1H-6400P 400 Watts 1U Server PSU EPS
NIC: Intel Pro PT1000 Server 1 Port (makes 4 (!) NICs: 2 onboard (unused) 1 for remote management, 1 main)
Cooling: 2*4cm PSU fans, 5*4cm centre fans, 1*4cm outlet fan, 1U passive CPU heatsink.
Network: 100 MBit/s up and down.

As you see, it's all 1st class reliable server hardware, decent enough for our serious gaming biz ;-)

CEONSS#12 specs are:

• CPU: Intel Core i5 3570K (3.4 GHz, Turbo Boost 3.8 GHz, 22nm), single thread performance 9% higher compared with our former Xeon 1270. Note that UT2004 can only use one single core, hence, single thread performance is the only relevant factor, multi-core systems don't help at all.
• RAM: 16GB
• HDD: 2*500GB Western Digital @ RAID1
• Network: 1 GBit/s up and down, "short path routing", dedicated for gameservers.
• 128Gb Samsung SSD - 21/7/14