Originally Posted by ffejrxx
the intel vrms are on the cpu die, the ones on the board dont do much
The only thing on the die is the controller for the VRMs. The MOSFETS that handle the heavy lifting of dropping that 12V rail to the ~1.3V for the CPU are still on the motherboard where they have always been. There is no getting around the efficiency characteristics of such a low voltage, high current load.
Here's a $125 motherboard that is limited to 65W operation due to VRM limitations:
Compare that to this board:
Can you spot the difference that lifts the TDP limit and allows the second board to run 84W chips?
SuperMicro knows, that a 2 phase VRM for the CPU, even with the VERY HIGH QUALITY PCB and MOSFETS they are using, can't handle the 80W chips over the long haul. So when someone sells you a $45 board with a similarly sized VRM setup with much cheaper parts, do you believe that it runs 80W chips without a problem? Do you believe it is even good for 50W over the long haul? Where is the limit really? 30W?
I'll leave that testing up to the warranty department over at emachine. Buying a $45 H81 board is pointless for numerous reasons, regardless of whether it can magically handle running the load of the 30-50W pentium/i3 or not. (I would not be surprised if it ran into problems even doing that).
I want to point out, that on the 2 and 3 phase power of the SuperMicro boards, they are using the same sort of ultra-low resistance mosfets found on expensive Z87 ITX overclocking boards. $45 motherboards don't come with that sort of stuff, a 2-3 phase power supply on a $45 motherboard uses the cheapest mosfets they can get their hands on that will work "in theory."Edited by mdocod - 4/19/14 at 8:37pm