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GIGABYTE X99-Phoenix SLI (Intel X99) Motherboard Review

By: Steven Bassiri | Socket LGA 2011 in Motherboards | Posted: Jun 28, 2016 4:48 pm
TweakTown Rating: 92%Manufacturer: GIGABYTE

Circuit Analysis




Now we will dig deeper into the motherboard's design.





To power the input voltage rail that powers the FIVR, GIGABYTE is using a straight 8-phase voltage regulator exclusively powered by International Rectifier silicon. The inductors are the same 76A Cooper Bussman COILTRONICS FLAT-PAC high current power inductors found on GIGABYTE's earlier X99 motherboards. The capacitors are black FPCAPs; I am unsure of the hour rating, but I assume 5 or 10K.




GIGABYTE is using the latest International Rectifier (owned by Infineon) IR3580 true 8 phase digital PWM. They are also using eight IR3556; 50A fully integrated power stages that include a driver, high-side MOSFET, and low-side MOSFET in a single package. The VRM is more than capable of handling the $1700 6950X with ease. The motherboard also has extra pins in the socket that could enhance overclocking of cache and memory; these pins are powered by a special array of linear regulators located below the first 16x PCI-E slot and controlled by an IT8792E embedded controller.




Both sets of four DIMMs use identical power delivery setups. The main PWM is an IR3570 digital 3+2 phase PWM working in 2+1 phase mode. Two phases use IR3553 40A fully integrated power stages for the main DDR4 voltage, and the VPP uses a single phase IR3553.

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