Originally posted by: JEDIYoda
.....they dont claim that a bigger fan is going to perform worse than their smaller fan somehow.
they claim that their PSUs are better (in this respect) because they have clearer airflow for the larger heatsinks inside, and a powerful 80mm. nothing more...
Clearly, you need to reread PCP&C's myth page again, because PCP&C does indeed claim that using a 120mm fan will negatively impact a power supply's ability to function......
And I quote from PCP&C's made-up-myths page:
Most low-noise ATX power supplies today utilize a top-mounted 120mm fan rather than a rear-mounted 80mm fan. The 120's favorable reputation is based on the fact that under low to medium load conditions, the 120mm fan provides sufficient cooling at low RPM and low RPM fans are generally very quiet.
However, problems occur with this design when the load exceeds 50%-60%. Because the 120mm fan consumes about 1.5" of vertical space inside the PSU, heat sinks, capacitors, and other components are about 30% smaller in height compared to a PSU with a rear-mounted fan. The smaller parts can handle less current, so the maximum power available with the 120mm design is limited. And, because the heat sinks have less surface area, more air flow is needed with this design to keep the thermal situation under control. With 80%-100% load, the 120's fan speed can double and the noise level can jump by up to 20dB.
In conclusion, for systems that require more than 50% of the power supply's capacity, a well-engineered PSU with a rear-mounted 80mm fan will provide superior performance and reliability (due to larger components) at a noise level comparable to a PSU equipped with a 120mm fan.
Excuse me? An 80mm fan will lead to more reliability because the internal components are bigger/taller? I didn't know the MOSFET transistors or rectifiers were in any way height limited, or that using multiple primary caps in a power supply in any way impacted performance or durability or reliability.
Of course, the above is really busted when you compare two well known power supplies and their internal construction.
Let's see if you can spot the "larger capacitors and other components" in the two below:
Well known Power Supply #1.
Well known Power Supply #2.
Can't tell what is who? Maybe this will help.....pics of same two power supplies and their bridge rectifiers with heat sinks.
Bridge Rectifiers w/heat sink....PS #1.
Bridge Rectifiers w/heat sink...PS #2.
Still cannot tell what is who or which is using a 120mm fan vs. an 80mm fan.....because one is using a 120mm fan and one is using an 80mm fan.
Here's hint #3.......
12V Secondary w/heat sink......PS #1.
12V Secondary w/heat sink.....PS #2.
OK.....that should have been the giveaway. But I have yet to see one single smaller part when comparing the two......outside of the size of the fan.
Power Supply #1 is a Seasonic M12D 850W. PS #2 is a PCP&C Silencer 910W. Interesting how both are using pretty much the same exact components of the same exact size, height, capacities, etc. I see no difference in their sizes, heights, or much of anything else, which I should have seen given PCP&C's claim that Seasonic, using a 120mm fan for cooling, would have to resort to internal components of up to 30% smaller in size and capacity vs. what is used in the PCP&C power supply.
But, alas, they're virtually identical, as they should be since the PCP&C Silencer 910W is simply a tweaked Seasonic M12D......and almost indistinguishable outside of the heatsinks being arranged differently on the primary and secondary for differing air flow patterns. I'd think there is absolutely no 30% loss of surface area in the Seasonic's heat sinks vs. the PCP&C heat sinks.....but you be the judge.
I'm just calling PCP&C's claim utter bullshit......call it what you will. But pictures speak louder and with ultimate truth vs. PCP&C's crap myth.
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