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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

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

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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.

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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.

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

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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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