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ASRock X299E-ITX/ac Motherboard Review

By Steven Bassiri from Nov 6, 2017 @ 8:09 CST
TweakTown Rating: 93%Manufacturer: ASRock

Circuit Analysis




The X299E-ITX/ac is the most unique X299 motherboard I have reviewed.




The motherboard features a 6+1+1 phase VRM for the CPU input voltage, VCCSA, and VCCIO. I want to mention that the motherboard does not support Kaby Lake-X CPUs, only Skylake-X CPUs. ASRock uses Intersil's new high performance ISL99227F 60A Smart Power Stages with internal current and temperature monitoring. The Intersil ISL69138 is used in 6+1 phase PWM mode, and it is part of Intersil's new set of digital PWMs. ASRock also uses 60A inductors for the CPU VCore phases. The VCCSA uses the same Smart Power Stage as the main power supply rail.





For the VCCIO ASRock still employees another ISL69138, but uses an Intersil ISL6596 driver, and a Sinopower SM7341EH dual N-channel MOSFET. The Sinopower is rated for about 25A. We also see one of these driver + dual N-channel FET combos near each set of two DIMMs.




Each memory VRM uses the same Intersil ISL69138 digital PWM, and it kind of seems like a bit of a waste considering the number of rails not used, but I assume ASRock wanted to maximize features, so the motherboard has more digital PWM technology on board than needed. One of the Sinopower dual N-Channel's is hidden under the PCI-E x16 slot.

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