Gigabyte G-Power-Pro Heatsink Review

The Gigabyte G-Power-Pro is a heatpipe enabled heatsink designed for all types of socketed processors including Intel P4-478/775, AMD K7 and K8. Here is an overview of the system and testing methodology.

Soltek SL-K8TPro-939
Athlon64 3200+ 512KB L2 Cache 939 ADA3200DIK4BI
Gigabyte G-Power=Pro Heatsink
Alpha PAL8150A using a Sunon KD1208PTB2 Fan
Stock AMD Heatsink
CPUCool was used to obtain and record system temperature information and a game of Quake 3 provided the 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 Quake 3 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 heatsink 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 = 80%
CPU Watts = 67W

0.55 C/W = (55C - 25.5C)/(.8(67W))

For this next test the FSB was cranked up to 245Mhz and the test was re-run.

To calculate a new C/W rating for this test 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 = 2450
dMhz = 2000
ocVcore = 1.6
dVcore = 1.39
The variance still applies for our C/W calcuation
Allowed variance for this test = 80%
CPU Watts = W

0.59 C/W = (77C - 25.5C)/(.8(109W))

As you can see from the numbers, the heatsink performs well at stock settings, but really begins to break down as the clock frequencies are increased. This is not really a bad thing unless you are looking to overclock. Overall the Gigabyte G-Power is an average performing heatsink that will work quite well on most 478 and K7 systems but begins to reach its cooling limit on our K8 test bench.

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