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GIGABYTE X299 Designare EX (Intel X299) Motherboard Review (Page 3)

By Steven Bassiri from Jan 18, 2018 @ 10:00 CST
TweakTown Rating: 93%Manufacturer: GIGABYTE

Circuit Analysis


The X299 Designare EX looks great without any heat sinks on.


The new VRM went from a true 8-phase VRM to a 12-phase VRM based on 6-phases doubled up, which allows for higher power output. The Intersil ISL69138 true digital PWM controller from Intersil is in a 6+1 phase configuration. All CPU and memory power uses ISL99227 Smart Power Stages, which are rated 60A, have internal current and temperature sensors, and offer double-sided cooling capacity (bottom through PCB and top through a metal area). The inductors are rated for 51A (can go higher if needed but with a lot of core loss) high current power inductor.


Doubling is done through six Intersil ISL6617 PWM phase doublers located on the rear of the PCB. We find ISL69133 four-phase PWM controllers for the memory VRM and VCCIO VRM. Each of those power stages clock in 60A each.


Each memory VRM is made up of two phases for the DRAM and one phase for the VPP voltage.


We find one of the VPP VRMs under the CPU socket to the left, while the one to the right is for VCCIO.

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