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ASUS ROG Maximus X Apex (Intel Z370) Motherboard Review (Page 3)

By Steven Bassiri from Nov 10, 2017 @ 8:08 CST
TweakTown Rating: 93%Manufacturer: ASUS

Circuit Analysis


The Maximus X Apex reveals its secrets when the heat sinks and shields come off.


The VRM on the Maximus X Apex is in an 8+2 phase mode. It also uses ASUS's 10K capacitors and microfine alloy chokes.


The VRM on this motherboard uses ASUS's ASP1405I, which is probably like an IR35201 fully digital PWM controller that offers up to 8 phases, but here it's outputting 4+2 phases. Each PWM phase (for the VCore) from the digital PWM is doubled by an IR3599, and we find four of these doublers on the topside of the PCB. Each doubler then outputs to an IR3535 driver, and we find ten of them on the backside (8 for CPU, 2 for iGPU). The MOSFETs are Infineon OptiMOS BSG0812ND, which should be rated for 50A. The VRM here is very similar to the Maximus IX Apex, but it uses different power blocks.


The memory VRM and CPU secondary rail VRs (VCCSA and VCCIO) are exactly identical to that used on the Maximus IX Apex. The memory VRM uses a rebranded two-phase controller for the memory PWM (seems like it has integrated drivers), with two N-channel MOSFETs. The VCCSA and VCCIO get power from a Texas Instruments TPS51362 10A converter and a single phase VRM controlled by an Anpec PWM and PowerPAK MOSFETs.

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