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  #1  
Old 02-23-2017
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Default Do the Corsair RMi and RMx use a different fan controller?

As in subject: see

RM650i

vs

RM650x

Is that due to the fan controller, or the NR135P and NR135L are rather different fans, despite being both 0.22A ones?
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Old 02-23-2017
Dirtymacho Dirtymacho is offline
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Yes both uses different fan's altogether.

RMx uses riffle bearing fan

RMi uses fluid dynamic bearing ( Last longer )

As such its basically a cost cutting to deploy different fan types.

The type of bearing used in a fan can affect its performance and noise output. Most computer fans use one of the following bearing types:

Sleeve bearing fans use two surfaces lubricated with oil or grease as a friction contact. Sleeve bearings are less durable as the contact surfaces can become rough and/or the lubricant dry up, eventually leading to failure. Sleeve bearings may be more likely to fail at higher temperatures, and may perform poorly when mounted in any orientation other than vertical. The lifespan of a sleeve bearing fan may be around 40,000 hours at 50 °C. Fans that use sleeve bearings are generally cheaper than fans that use ball bearings, and are quieter at lower speeds early in their life, but can grow considerably noisier as they age.

Rifle bearing fans are similar to sleeve bearing, but are quieter and have almost as much lifespan as ball bearings. The bearing has a spiral groove in it that pumps fluid from a reservoir. This allows them to be safely mounted horizontally (unlike sleeve bearings), since the fluid being pumped lubricates the top of the shaft. The pumping also ensures sufficient lubricant on the shaft, reducing noise, and increasing lifespan.

Ball bearing fans use ball bearings. Though generally more expensive, ball bearing fans do not suffer the same orientation limitations as sleeve bearing fans, are more durable especially at higher temperatures, and quieter than sleeve bearing fans at higher rotation speeds. The lifespan of a ball bearing fan may be around 63,000 hours at 50 °C.

Fluid bearing fans have the advantages of near-silent operation and high life expectancy (comparable to ball bearing fans). However, these fans tend to be the most expensive. The enter bearing fan is a variation of the fluid bearing fan, developed by Everflow.

Magnetic bearing or maglev fans, in which the fan is repelled from the bearing by magnetism.

wiki, link.https://en.wikipedia.org/wiki/Computer_fan
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Old 02-23-2017
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The fan control is completely different. The RMi has a microcontroller for fan control and does use PWM to control the fan speed. The RMx just has a normal fan controller that simply adjusts the fan voltage.
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Old 02-23-2017
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no, the RMx also has a microcontroller, but a completely different/smaller PIC...
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Quote:
Originally Posted by Dirtymacho View Post
Yes both uses different fan's altogether.
Do you know your answer is off topic and basically useless?
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Old 02-23-2017
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Quote:
Originally Posted by Microflop View Post
The fan control is completely different. The RMi has a microcontroller for fan control and does use PWM to control the fan speed. The RMx just has a normal fan controller that simply adjusts the fan voltage.
Quote:
Originally Posted by Stefan Payne View Post
no, the RMx also has a microcontroller, but a completely different/smaller PIC...
So, Nico & Stefan, the faster fan on RMi is due mostly to what?
Different ICs cannot be programmed with the same "curve"?
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Old 02-23-2017
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Stefan is correct.

Both RM's use an MCU, but the RMi has a more powerful MCU since it has to be programmable.

They *shouldn't* have different initial fan curves programmed into them, though. But this isn't the first time Aris has found fan behavior that we're unable to duplicate in the labs. There's probably one single wacky variable that one MCU takes into account over the other....
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Quote:
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But this isn't the first time Aris has found fan behavior that we're unable to duplicate in the labs.
So the "official" one is... ?
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Old 02-24-2017
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Quote:
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So the "official" one is... ?
SF450 vs SF600.
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Old 02-24-2017
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Sorry, I didn't get you Tator: I recall the SF600 question, but I meant to which Aris' finding the "official" Corsair fan curve looks like, the x or i.
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