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[AnandTech] Thermaltake Releases New SFX PSUs: 450W and 600W, rated at 80 PLUS Gold - Page 4

post #31 of 35
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Quote:
Originally Posted by prava View Post
 
SX700-LPT is garbage. The fan is load-controlled only... meaning that if you have a computer with bad airflow (and small systems fall in that category, most of the time) you will have power failure problems because at low loads the fan won't even start.

Yup, I have no idea how exactly do you not consider the fact that the fan should also be temperature controlled.

But well, what can you expect from Silverstone? A company that sells the same products for no less than 5 years and never does revisions of any sorts.

I'm not exactly sure how much control Silverstone has over the design w/ High Power/Sirfa. Makes less sense considering the unit is using a larger fan so shame on either OEM or Silverstone but Silverstone isn't the only company offering good SFX PSUs anymore.

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post #32 of 35
Quote:
Originally Posted by prava View Post

SX700-LPT is garbage. The fan is load-controlled only... meaning that if you have a computer with bad airflow (and small systems fall in that category, most of the time) you will have power failure problems because at low loads the fan won't even start.

Yup, I have no idea how exactly do you not consider the fact that the fan should also be temperature controlled.

But well, what can you expect from Silverstone? A company that sells the same products for no less than 5 years and never does revisions of any sorts.

How do you know that the fan curve is load based? I spoke with Silverstone engineers who helped me identify the three NTC thermistor sensors that help with the fan curve, offset and OTP. It is most definitely temp based as well with power draw further increasing the temp on the secondary heatsink where the sensors are, I tested the unit at a 25 C and 35 C fixed ambient hotbox and varying power draw. Basically similar to the SF600.
post #33 of 35
Thread Starter 
Quote:
Originally Posted by geggeg View Post
 
Quote:
Originally Posted by prava View Post

SX700-LPT is garbage. The fan is load-controlled only... meaning that if you have a computer with bad airflow (and small systems fall in that category, most of the time) you will have power failure problems because at low loads the fan won't even start.

Yup, I have no idea how exactly do you not consider the fact that the fan should also be temperature controlled.

But well, what can you expect from Silverstone? A company that sells the same products for no less than 5 years and never does revisions of any sorts.

How do you know that the fan curve is load based? I spoke with Silverstone engineers who helped me identify the three NTC thermistor sensors that help with the fan curve, offset and OTP. It is most definitely temp based as well with power draw further increasing the temp on the secondary heatsink where the sensors are, I tested the unit at a 25 C and 35 C fixed ambient hotbox and varying power draw. Basically similar to the SF600.

I think it might be this review. But it also says that it's a hybrid load-based + temperature-based setup.

 

https://smallformfactor.net/reviews/powersupplies/silverstone-sx700-lpt-review-finally

 

Quote:
 Previous SilverStone SFF power supplies with semi-fanless functionality rely on simplistic temperature-based controllers that, in my experience, have trouble actually keeping the fan off even when the computer is idling. To address that deficiency, SilverStone has switched to a load-based fan controller for the SX700-LPT. This system bases the fan RPM off the current load level, with secondary input from temperature sensors that are supposed to ensure the unit stays cool if the internal temperature gets too high regardless of load.

 

The product page also suggests a load-based fan curve.

Quote:

 
Ultra-quiet 120mm fan with intelligent RPM control guarantees cool performance and silent operation with minimum of 18dBA during fan operation. The fanless mode operation deactivates when PSU’s loading reaches 30%.

 

But like VSG said, most likely a hybrid setup.


Edited by HybridCore - 8/4/16 at 4:04pm
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post #34 of 35
Even that article mentions the temperature input on fan curve, along with load. In the end, the sensor is a temperature sensor so there is always a dependence on temperature.
post #35 of 35
Depending on price could be a real winner. Decent SFX are not cheap.
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