Demonic XTC Waterblock Review

The Demonic Watercooling XTC is designed for AlthonXP processors at any speed with performance and overclocking in mind. Here is an overview of the system and testing methodology.

DFI LanParty NFII Ultra 400 Rev B
Athlon XP2400+ Tbred (AXDA2400DKV3C)
Demonic Watercooling XTC (Extreme Turbulence Cooling)
Little River White Water
CoolerMaster Aero 7+

The watercooling system consisted of a Hydor L30 pump, Black Ice Pro radiator, Sunon 120mm fan (running 7v), and a small reservoir for water storage and air collection. 3/8" I.D. hose was used throughout with minimum hose lengths used whenever possible.

Motherboard Monitor was used to obtain and record system temperature information and a game of Halo provided the 100% processor usage.

Editors note: Even though the Windows XP task manager reported 100% processor usage we could never attain a 100% of the rated heat output as documented by AMD (see below) when using Halo as a basis for that heat production. Knowing this, the game was played until the maximum temperature was attainted and stabilized, or when the round was over.

Other things to consider when judging software induced heat output.
a) Clock throttling by the processor at high temperatures.
b) Normal software isn't designed to produce maximum heat output.
c) Variances of cooling temperature.
d) Variances in CPU load.
e) Inaccuracies in thermal diode readouts.
Of course the list goes on..

My testing methodology is aimed to provide a real world look into this waterblock given the test system provided.

A C/W rating can quickly be calculated using this formula.

C/W = (CPU temp - Ambient temp)/(Variance(%) * CPU Watts)
Allowed variance for this test = 90%
CPU Watts = 68.3W

0.22 C/W = (38C - 24.5C)/(.9(68.3W))

For this next test we cranked the FSB up to 200Mhz and re-ran the tests. To calculate how the C/W rating has changed we will need to factor in the increased processor wattage. The formula and constants for this are listed below.

ocC/W = dCPU Watts * (ocMhz / dMhz) * (ocVcore / dVcore)²
ocMhz = 2200
dMhz = 2000
ocVcore = 1.725
dVcore = 1.65
The variance still applies for our C/W calcuation
Allowed variance for this test = 90%
CPU Watts = 81.9W

0.21 C/W = (40C - 24.5C)/(.9(81.9W))

Even without velocity nozzles the Demonic XTC performed within 2 degrees of the rival White Water block. This is pretty impressive given the overall test system and setup.

Keep in mind this calculation is provided for demonstration purposes only and may not reflect the actual lab tested C/W rating, but I think I'm close