FrostyTech Synthetic Temperature Test Platform Results
Mfg.	Model	Ambient Temp.	27mm large copper block	15mm small copper block		27mm large copper block	15mm small copper block	Thermal pad	No. Fans	Fan Noise	Clip force
			50W	50W		100W	100W
Thermalright	SLK800	21.7	34.8	37.5		45.2	51.6	none	1	loud	med
Thermalright	AX-7	21.7	34.8	37.1		46.1	52.1	none	1	loud	med
Tocools	Novasonic	22.9	40.9	39.9		54.4	59.4	none	1	med	stiff
Coolink	U1P2	26.1	39.4	44.9		50.9	62.2	none	2	loud	easy
Arkua	628	23.9	42.7	42.1		58.9	62.3	none	1	med	med
Thermal Integration	TI-V77L	26.5	39.1	44.4		57.5	63.6	grey	1	med	med
Sibak	AC02625B	23.2	41.3	59.0		43.2	64.7	none	1	loud	med
Coolink	U2P	27.1	40.6	47.6		55.3	67.6	none	1	loud	easy
Sibak	AC06725TH	22.5	42.9	46.2		61.7	67.7	none	1	Very loud	med
Coolermaster	HHC-001	21.7	40.0	44.8		56.3	68.1	none	1	loud	easy
Tocools	Crown	23.2	38.8	53.2		47.9	70.2	none	1	loud	stiff
Dynatron	DY1206BH-625	23.2	40.0	55.1		47.6	70.4	none	1	loud	stiff
Coolink	H2T	27.1	44.5	49.0		60.8	70.9	none	1	med	easy
AVC	Tundra2	22.0	41.4	47.5		59.0	71.1	none	1	loud	stiff
Coolink	U1L2	26.1	42.3	51.1		57.9	72.2	none	2	med	easy
Vantec	CCK-6027D	27.4	45.4	49.6		64.9	73.4	none	1	med	med
Akasa	Ag Mountain2Q	21.7	42.4	48.5		61.2	74.5	none	1	med	med
Coolermaster	HSC-V62	21.4	47.4	52.8		61.7	74.5	none	1	quiet	easy
NengTyi	XPC5000	23.9	46.5	49.1		69.1	76.1	none	1	med	med
Coolink	U2L	27.1	45.6	52.6		62.7	76.2	none	1	med	easy
Spire	5F263	22.6	44.7	51.8		64.3	76.2	white	1	low	med
Titan	TTC-CU5TB	24.2	46.2	51.2		61.8	76.4	none	1	loud	stiff
Taisol	CGK760092	23.4	42.7	51.3		61.2	77.5	pink	1	low	med
Spire	5T235	22.3	43.0	50.3		62.8	78.1	white	1	med	med
Zalman	CNPS6000-Cu	24.8	46.4	53.8		65.6	78.2	none	1	very low	easy
Ajigo	MF014-021	27.8	47.6	54.0		65.6	78.5	grey	1	med	med
Ajigo	SF017-011	27.2	47.5	55.1		65.7	78.9	grey	1	med	med
AVC	112AM1	24.8	46.6	52.9		70.1	79.6	none	1	low	stiff
Coolink	H1T	27.1	49.2	53.6		69.4	79.9	none	1	med	easy
Sibak	AE01625B	23.5	40.8	54.4		57.1	81.0	none	1	loud	easy
Coolermaster	HHC-L61	21.5	47.2	48.3		71.2	82.3	none	1	quiet	easy
Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
JMC Products	400023	23.1	44.5	65.2		55.3	85.2	Chomerics T725	1	low	easy
Akasa	AK821	22.7	49.4	57.2		74.1	93.2	grey	1	med	med
Sibak	AT01515B	23.0	45.1	64.6		60.1	95.2	none	2	med	stiff
Verax	P11T	26.1	61.2	69.7		90.9	102.7	none	1	none	easy
Verax	P14	26.1	56.9	67.4		81.6	101.2	none	1	none	easy
			50W	50W		100W	100W

The combination of a lower noise fan solution and the Akasa AK821 turned out to be less than what we would have hoped to have seen, and is somewhat confusing. I would have thought the AK821 would be capable of better performance but after multiple rounds of testing we saw the same level of performance crop up each time.

There are two reasons we can think of why this heatsink just doesn't seem to perform as well as it ought to. The first may be because the fan is underpowered, and the second may be related to the fan shroud. The aluminum fan shroud only comes down 6mm on the sides of the pins, and it may be that the airflow from the fan is not moving down far enough into the pins to cool properly, or a hot spot is developing at the center.

In any case, the temperature results we have seen here are nothing to get excited about - and for a heatsink with copper base insert, not very impressive. If you are looking for a good socket A heatsink, I'd suggest passing on the AK821 and opting for one of Akasa's other models, like the Silver mountain 2Q.

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