FrostyTech Mk.II Synthetic Thermal Heatsink Test Results Intel Pentium D / Extreme Edition & Quad Core class heatsinks tested at 150W Intel Core 2 Duo / Pentium 4 / Celeron class heatsinks tested at 85W Results based on readings from a 30x30mm copper interface die with 150W and 85W heat loads applied on the LGA775 version of the Mk.II Test Platform. Temperature results listed for each heatsink were calculated by determining the rise over ambient temperatures at time of test. Information on Frostytech's test methodology is available here. Socket 775 compatible CPU heatsinks
manufacturer:	model no.:	fan speed:	150w thermal test* (°c)	85w thermal test (°c)	noise level (dba)
Thermalright	Ultra 120		17.8	10.6	53.7
3Rsystem	Iceage 120	high	18.2	12.1	47.9
Coolermaster	Hyper 212		19.0	11.8	45.9
Apack	Zerotherm BTF92 OC Ed	high	19.0	11.2	53.6
Zalman	CNPS9700 LED	high	19.0	10.4	56.5
Tuniq	Tower 120	high	19.6	12.2	51.6
Thermalright	Ultra-90	high	19.6	13.0	56.2
Enzotech	Ultra-X	high	20.0	8.5	59.1
Noctua	NH-U12P	high	21.3	13.4	40.7
Apack	Zerotherm BTF90		21.8	12.7	52.1
Xigmatek	HDT-S963	high	21.9	13.7	50.2
Akasa	AK-965	high	22.2	13.8	48.1
Apack	Zerotherm BTF80		22.8	13.9	51.9
Cooljag	Falcon 92-AL	high	23.2	14.2	52.1
Rosewill	RCX-Z3	high	23.3	14.0	58.6
Coolink	Silentator	high	23.5	16.4	41.2
Scythe	Mine Rev. B		23.6	15.0	36.8
Cooljag	Falcon 92-Cu	high	23.6	14.8	52.8
Akasa	AK-920	high	24.3	14.1	52.9
Asus	Arctic Square	high	24.9	14.9	44.9
Akasa	AK-922 (EVObue)	high	25.5	15.4	60.3
Coolermaster	Aquagate Mini R80	high	25.7	16.2	59.2
Glacialtech	Igloo 5610 PWM	high	25.9	15.9	59.5
Thermalright	SI-128SE		26.5	15.2	44.5
Auras	SLC-747	high	27.9	25.7	52.2
Thermalfly	F1-IACSHA	high	29.0	18.3	60.4
nPowertek	TTIC NPH1000		29.3	16.8	47.5
Glacialtech	Igloo 5710 Silent		29.4	18.0	43.4
Thermalfly	I75DUB	high	29.5	16.8	68.5
Zalman	CNPS9500 AT		29.6	17.3	53.3
Coolermaster	Hyper TX2		29.9	18.8	53.7
Alpha Novatech	PRE9060M92P	high	29.9	18.5	51.5
Scythe	Kama Cross		30.0	18.8	40.0
Akasa	AK-961		30.0	18.7	60.7
Rosewill	RCX-Z2-EX	high	30.1	18.7	45.9
nPowertek	NPH-775-1		30.1	18.8	50.1
Glacialtech	Igloo 5610 Silent		30.4	17.1	44.7
Sunon	Waturbo		30.6	18.3	57.5
Apack	CF800	high	31.4	20.7	48.4
Thermaltake	Jungle512	high	31.6	20.4	60.8
Coolage	Frozen Orb F0-Z924AL	high	32.0	19.9	48.9
Xigmatek	AIO-S80DP	high	32.4	21.4	55.0
Scythe	Katana II		32.5	18.6	37.9
Rosewill	RCX-Z2		32.6	19.3	59.9
Zalman	CNPS7700-Cu	high	32.9	19.7	50.7
Apack	CF900	high	32.9	20.3	48.3
Evercool	PT02-9232CP		33.3	19.9	63.3
Zalman	CNPS7700-Cu LED	high	33.5	20.6	49.8
Scythe	Ninja Mini		33.7	19.9	41.7
Thermalright	MST-977SLE		33.8	20.0	46.5
Intel	Stock Pentium D	high	33.8	20.7	47.5
nPowerTek	SF775-2	high	34.7	21.1	64.6
Akasa	AK-960E		36.1	21.4	56.3
Zalman	CNPS7500-Cu LED	high	36.4	22.9	50.9
Thermalfly	I75DUH		37.8	22.8	48.7
Akasa	AK-975CU	high	38.4	23.0	47.7
Cooljag	OAK-H	high	38.5	22.9	55.7
Cooljag	OAK-H2	high	38.6	24.1	55.6
LS Cable	SHS-T700		38.7	22.8	48.5
Intel	Stock Core 2 Duo		49.2	29.0	36.7
Glacialtech	Igloo 5062 Cu Light		50.6	29.7	45.2
Glacialtech	Igloo 5057 E		58.5	36.1	53.4
Spire	Fourier IV SP607B3-C		63.6	18.7	60.2
Cooljag	OAK-H	low	95.3	54.5	29.5
			150w thermal test (°c)	85w thermal test (°c)	noise level (dba)
*heatsinks are ranked according to the 150w thermal test results column (rise over ambient temp.). low temperatures with low noise levels are considered best. for reference heatsinks with variable-speed fans, only the high speed (12v) fan test result is included in the comparison sheet; more detailed results reside in each specific heatsink review.

the heat output from intel processors varies widely between single and multi-core processors, so frostytech uses two values which represent the upper limit of each existing cpu family. with a 150w heat load applied by the intel lga775 version of frostytech's synthetic thermal test platform, the Thermalright SI-128SE heatsink yields a rise above ambient temperature of 26.5°C (44.5 dBA) at the fans' stock speed of 1500RPM. The processor equivalent of this heat load would be an Intel Pentium D / Extreme Edition or Core 2 Quad class CPU.

To measure the effectiveness of the Thermalright SI-128SE heatsink on a Intel Core 2 Duo class processor, an 85W heat load is applied next. The SI-128SE heatsink handles this equally well, maintaining a 15.2°C rise over ambient temperature. Obviously, the benefits of buying a heatsink like this allow the user to install whichever type of fan they choose; high powered for low temperatures, ultra-quiet for low noise, or a mix of the two like the Mechatronics G1225S12B 120mm fan used in this review.

Consequently, we must mention that the thermal test results on both AMD and Intel test platforms are only valid for the above type of fan - if you select a different 120mm fan you will see different thermal results.

Regardless, the Thermalright SI-128SE heatsink performed well on both Intel and AMD thermal test platforms. Frostytech tests all heatsinks in their stock configuration, so we made no attempt to lap the base of this heatsink. Doing so may improve thermal results a single, or a few degrees. While we opted to test with a 120mm that produced good low noise levels, a faster paced fan would improve the SI-128SE's test results further. So there you have it, BYOF for the type of performance you want (and the noise level you are willing to live with).

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