Articles: Cooling

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Design and Functionality

Corsair H70 liquid-cooling system is based on the new Asetek 570LC platform and consists of a radiator with fans, a pump with a water block and connecting tubes:


The system is extremely compact, although the radiator has grows twice as tall as the one in the previous H50 model and now measures 49 mm:

The length and width of the radiator remained the same – 152x118 mm. The radiator design also hasn’t changed a bit: it consist of 11 flat heatpipes with corrugated band soldered to them. The mesh is about 1-1.5 mm wide:

There are two tubes coming out of the bottom of the radiator. Each is 9 mm in external diameter:

The tubes are very firm, because they are wrapped in spiral cords and are 200 mm long (between the radiator and the pump). It may cause some problems during water block installation onto the processor. Corsair H50 had 300 mm long tubes.

There is a very uninformative sticker on one side of the radiator:

The water block and pump unit has also grown more compact. Now it measures only 72x72x28 mm:


There is a layer of “highly efficient thermal interface based on aluminum oxide” pre-applied on the base surface. However, it seemed a little too dry, which posed some concerns about its efficiency. And in fact, our concerns were absolutely justified: this thermal interface lost 3°C to Arctic Cooling MX-2 in the very first tests, and this difference may have grown even greater with the time.

There are two tubes coming out of one side of the pump and a three-pin 310 mm long cable – out of another. This cable can be plugged into any three-pin mainboard fan connector:

We don’t know anything about the pump performance. However, we managed to learn from the specs that the pump uses a ceramic bearing with 50,000 hours MTBF. According to the specifications, the pump’s maximum power consumption shouldn’t exceed 2.6 W (3.3 W according to our measurements). But the noise level is declared relatively high: 26-37 dBA.

The base surface finish is of mediocre quality: we see and feel the machine marks on it. at the same time, it is impeccably even, so the uneven imprint you see on the photograph below is solely the fault of our six-core test CPU, which heat-spreader is of slightly convex shape:


Moreover, it looks like the pressure wasn’t applied evenly when the water block was attached to the mainboard, although all the retention screws were tightened up to their maximum. We should probably blame the weak retention frames, which wouldn’t allow us to press the water block firmly enough on all four corners. We could lap the CPU heat-spreader or replace the water block retention with something sturdier and thus improve this situation. Unfortunately, we couldn’t do either of these, but we are going to take this fact into account when we analyze the obtained results later in our review.

This time we decided not to take the water block and pump apart, because you can clearly see from the pictures available on Asetek web-site that the water bock remained exactly the same:

It uses the same dense micro-channel internal structure of 6-7 mm tall copper fins.

The fans manufactured by Yen Sun Technology (YS Tech) have KM121225LB model number, i.e. these are the same fans as the one used in Corsair H50. However, the new H70 model has two of them:

At the same time, unlike the Corsair H50 fan, H70 fans are not PWM controlled, but come with an additional adapter-splitter that lowers their rotation speed from the maximum 2000 RPM to 1600 RPM. I am sure you understand that both these modes will be too noisy not only for those who value quiet systems, but even for the majority of regular users, so it would be better to bring the PWM control option back into the game instead of this rotation speed management method.

The fan impeller is 104 mm in diameter, the rotor – 41 mm in diameter. The three-pin cable is only 200 mm long. The double ball bearing inside the fan motor should last 80,000 hours without failing. The fans are firmly attached to the radiator using long screws with washers. Corsair H70 system doesn’t come with any shock-absorbing mounts. The minimal startup voltage for the fans is 2.3 V, and two of them consume 2.3 watts of power under peak load.

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