Z390 Phantom Gaming X - VRM Analysis

Vcore and IGPU Earlier last month we released our review of the AsRock Z390 Phantom Gaming X (Italian) , praising its features and overall quality, today we are going to analyse its VRM. The ASRock Z390 Phantom Gaming X features a 14 phase VRM using a 6 phase (with a doubler) configuration for the Vcore + 2 phase configuration for the iGPU. Most of the components are similar to the one present on the Z390 Phantom Gaming 7 we released a couple of weeks ago(Italian). The Vcore controller, the ISL69318 from Intersil is a Digital Multiphase Controller configurable to support any desired phase assignments up to a maximum of seven phases across the two outputs (X and Y), here we see it using a 6+1 configuration with a total of seven ISL6617A doublers in order to achieve the 14 phases count. [caption id="attachment_99249" align="alignnone" width="940"] Here are shown 4 of the Vcore doublers and the IGPU doubler[/caption] The Vcore and SOC power stages are the Vishay SIC634 , which are DrMOS(Driver Mosfet) being able to support a maximum amount of 50A continuous current and 55 A at 10 ms peak current, with a switching frequency up to 2MHz, the bad size is that the DrMOS do not do current and temperature monitoring, this lack is balanced by the doublers used (which incorporates current monitoring). Let's take a look at the efficiency and heat output of the Vcore: Vcore Switching Frequency Current Heat 1,0 V 500 kHz 100 A 8 W 1,0 V 500 kHz 150 A 12 W 1,0 V 500 kHz 200 A 18 W 1,0 V 500 kHz 250 A 25 W 1,0 V 500 kHz 300 A 36 W 1,0 V 500 kHz 400 A 56 W 1,0 V 500 kHz 500 A 85 W 1,0 V 500 kHz 600 A 120 W The range 100A to 200A is the one in which an Intel I9-9900K operates on ambient cooling, considering the stock settings and the typical maximum OC possible, we can see how the total heat that will be produced will be perfectly handled by the massive cooling present on the VRM, the higher current values are usually for Liquid Nitrogen overclocking whereas the last value (600A) is the maximum amount of current that will be handled, continuously, by the Vcore. [caption id="attachment_99248" align="alignnone" width="940"] The Massive Super Alloy XXL heatsink[/caption] The phases are cooled by two aluminium blocks (Super Alloy XXL) with a substantial mass and have "aerodynamic" fins to improve heat dissipation. The armour plate, located on the back of the motherboard, provides structural solidity, but no type of cooling. Memory VRM [caption id="attachment_99253" align="alignnone" width="940"] The two memory phases and their controller[/caption] The memory layout is a T topology so it will prefer RAM configuration which will use all the available slots, a 4*X configuration, rather than a 2*X configuration. For the memory compartment, we find the UPI uP1674P with two Fairchild FDPC5030SG for a total current of 50A which are almost more than what will be needed to overclock any configuration of whatever memory sticks you will use, the limits will be given by the RAM chips used and the memory controllers. Conclusion I do not think we can find a single con for this motherboard, its VRM setup is able to hold, efficiently, up to 600A making it a perfect board for both ambient and sub-zero overclocking loads. The included heatsink is more than adequate for ambient cooling, due to their size as well as the substantial, and efficient, power supply section which will spread the heat out a large number of MOSFETs. Above 200A in the range of "exotic" cooling (phase change, cascade, dry ice, liquid nitrogen or helium) as well as at 250A you could even keep the phases uncovered without noticing overheating. Since the VRMs allow up to 600A maximum of theoretical current, you could push your system under liquid nitrogen, provided you will use the second EPS connector, 4-pin, just for the sake of not "burning" anything.

Z390 Phantom Gaming X – VRM Analysis

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