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GIGABYTE X99-Designare EX (Intel X99) Motherboard Review (Page 3)

By Steven Bassiri | Jun 30, 2016 07:51 am CDT
Rating: 93%Manufacturer: GIGABYTE

Circuit Analysis


So much beauty, so little time.


GIGABYTE's 8-phase true-digitally controlled VRMs work very well. They are using their 76A saturation current FLAT-PAC power inductors from Cooper Bussmann. GIGABYTE is also using 10K FP-CAPs for the output filter.


GIGABYTE is using the tried and true International Rectifier IR3580 8-phase digital PWM for control. The IR3556 are 50A power stages with integrated driver, high-side MOSFET, and low-side MOSFET all in a single package. This VRM is more than enough to power any X99 CPU. The extra pins in the socket also require their own power, and there are more than just a few of them, so multiple Richtek linear regulators are used, and they are controlled by a custom IT8792E embedded controller.


Each set of four DIMMs gets a two-phase VRM for the main DDR4 voltage rail. Each two-phase VRM has a single IR3570 3+2 phase PWM being used in 2+1 phase mode. The extra single phase powers a single phase VPP rail. The power stages are fully integrated IR3553 40A parts.

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