buildzoid

Enriched MSI Z690 Unify X PCB Breakdown notes

Added 2022-07-11 03:45:58 +0000 UTC

8 layer PCB. Having more PCB layers CAN help reduce the impedance of power planes. Which can lead to lower VRM+PCB operating temperatures and better voltage regulation.
Extra PCB layers can also help with RAM overclocking.

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Vcore VRM
CONTROLLER
RAA229131 20 phase controller running 19+0
// use 500KHz VRM switching frequency for best voltage regulation performance. Higher frequencies have steadily more and more buggy behaviour.

MOSFETs
RAA220105 105A SPS (peak effic a little over 94% at 1.2V)

MOSFET+INDUCTOR EXPECTED POWER LOSS
at 1.2V and 500KHz
200A 15W
300A 22W
400A 31W
500A 42W
600A 55W

OUTPUT FILTERING
220nH inductors
10x 560uF through hole aluminium polymers. 10K hours at 105C rated Nippon Chemicon

INPUTFILTERING
4x 270uF through hole aluminium polymers. 10K hours at 105C rated Nippon Chemicon

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iGPU VRM
not supporterd

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VCCIN VRM
MP2940 2 phase controller

MOSFETS
MP87992 70A SPS

MOSFET+INDUCTOR EXPECTED POWER LOSS
at 1.8V and 800KHz
40A 4W
70A 8W

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RAM
DDR5
1 DIMM per channel
All DQ (DQ=data queue) traces are on internal PCB layers (basically "shielding")
CAD bus at least partially on top layer of PCB

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Overclocking Features
POST code
internal Power and Reset button
rear IO clear CMOS button
rear IO BIOS flash button
dual BIOS with switch
voltage read points
OC controller with Power, Reset, BCLK up/down, safeboot, retry and clear CMOS
VRM fan (for cheating in VRM thermal tests :P)