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Miguel Almeida alias st0ned, known extreme overlocking guru from Portugal, does a quick and effective performance comparison of EK-Supreme HF and EK-Supremacy.

Test System:
Motherboard: Asrock Fatal1ty Z77 Professional
CPU: Intel Core i7 3770K @ 4800MHz (1.36V)
Memory: Samsung Low Profile DDR3-SDRAM @ 1800 9-10-10-26 (1.35V)
Graphics card(s): 2x AMD Radeon HD 7970

Watercooling:
Radiators: MagiCool Slim 360, FeserXChanger 360, Thermochill TA120.3 all with GT-AP15 1850rpm push
Fittings: 19/13 Compression Fittings
Water blocks: EK FC7970, EK HF Supreme-VGA , EK Supreme HF
Water pump: MCP-35X @ 100%
TIM: Arctic Cooling MX-2

Measuring Equipment:
Water Temp: 2x Thermistors coupled to a copper pipe on the CPU inlet with 0.1ºC resolution.

Testing Conditions:
Prime95 64bits with fixed FTT load (1024k) was used to load all the cores at 100%, I left it for a heat-up time around 30min and then Loged the temperatures using CoreTemp for another 20min. Water temperature was recorded with a camera and then registered on a 30 second interval. The final result is the average of both water temp sensors.

Review is published in PDF and can be downloaded here. Be sure to follow Miguel Almeida on Facebook!