The 25mm thick YS Tech fan with its 7 blades as a bit noisy as you can guess from the waveform image below, but wasn't ear shattering. The image shows some big jumps which are just static that entered in the recording somewhere.

To hear this heatsink, click on the pair of headphones pictured below.

Synthetic Temperature Test Results: *Ranked according to 100W interface die test results.

FrostyTech Synthetic Temperature Test Platform Results
	Mfg.	Model	Ambient Temp.	27mm large copper block		27mm large copper block	Thermal pad	No. Fans	Fan Noise	Clip force
				50W		100W
1	AVC	117140	22.6	37.8		50.4	none	1	med	med
2	Arkua	8568	22.4	37.8		51.7	none	1	med	med
3	Vantec	GSN-7025	22.5	41.7		58.5	none	1	med	med
4	Chauh Choung	DTA-478	22.4	42.1		59.0	carbon	1	low	med
5	Intel	Socket 478	22.4	41.8		59.8	carbon	1	low	med
6	Dynatron	DC1206BM-S	22.4	43.2		62.0	none	1	med	med
7	AVC	117160	22.4	42.7		62.2	white pad	1	med	med
8	Vantec	GSN-7015	22.4	47.5		69.0	none	1	loud	stiff
				50W		100W

If you saw our review of the Vantec GSN-7015 you noticed that it didn't do very well. While the GSN-7025 and that heatsink are closely related, the difference in performance is substantial - nearly 10 degrees. It's good to see the Vantec cooler has the stuff to outperform the default Intel socket 478 heatsink, otherwise there wouldn't be much point to switching coolers would there? The performance of the Vantec at 50W is not really any different than the Intel cooler however.

Please note, that since socket 478 heatsinks are only capable of mounting to a motherboard with a HSRM, we will only be testing them on the large copper interface die.

Rise Above Ambient Temp. (c)
	Mfg.	Model	27mm large copper block		27mm large copper block
			50W		100W
1	AVC	117140	15.2		27.8
2	Arkua	8568	15.4		29.3
3	Vantec	GSN-7025	19.2		36.0
4	chauh Choung	DTA-478	19.7		36.6
5	Intel	Socket 478	19.4		37.4
6	Dynatron	DC1206BM-S	20.8		39.6
7	AVC	117160	20.3		39.8
8	Vantec	GSN-7015	25.1		46.6
			50W		100W

The Vantec GSN-7025 manages to improve on the default Intel socket 478 cooler by a couple degrees - which isn't too bad considering the fan can at least be upgraded a lot easier. The Vantec coolers are generally priced so that OEM's can add them to their inventory, where as the AVC and Arkua coolers both use radical designs with copper cores.

Overall, we can see that the GSN-7025 gives users a slight edge over the standard heatsink Intel ships with its retail socket 478 Pentium 4 processors, and that is always welcome.