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Z390 Phantom Gaming X – VRM Analysis

di Gabriele Atzeni
23 Agosto 2019
in Analisi VRM, Reviews, Schede Madri
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1. Vcore and IGPU

  • 1. Vcore and IGPU
  • 2. Memory VRM
  • 3. Conclusion

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.

Here are shown 4 of the Vcore doublers and the IGPU doubler

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:

VcoreSwitching FrequencyCurrentHeat
1,0 V500 kHz100 A8 W
1,0 V500 kHz150 A12 W
1,0 V500 kHz200 A18 W
1,0 V500 kHz250 A25 W
1,0 V500 kHz300 A36 W
1,0 V500 kHz400 A56 W
1,0 V500 kHz500 A85 W
1,0 V500 kHz600 A120 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.

The Massive Super Alloy XXL heatsink

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.

Jump to section

1. Vcore and IGPU

  • 1. Vcore and IGPU
  • 2. Memory VRM
  • 3. Conclusion
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Gabriele Atzeni

Gabriele Atzeni

Sin da bambino appassionato di elettronica e PC, ha smontato il suo primo PC nel 1990 per poi litigare coi vari gestori di negozi di spare parts perchè non avevano il pezzo che diceva lui, dimostrandosi precocemente precisino e rompiscatole. Sportivo, amante delle freddure e se avete bisogno di supporto morale è la persona giusta. Nel supporto immorale poi, non teme confronti.

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