SMI300XS Exam Dumps - Supermicro MI300X GPU Questions and Answers

Thepower cableis the only cable that isnot a data cablewhen connecting an AOM card to the motherboard.

Cable Functionality Breakdown:

A (Power Cable) → NOT a data cable

Supplies electrical powerto the AOM card.

Doesnot transmit databetween components.

B (MCIO Cables) → Data cables

These cablestransmit high-speed NVMe data.

C (JNCIS1) → Data cable

This interface is used formanagement and communication.

D (SAS Cable) → Data cable

Used fordata storage connections.

Official Documentation Reference:

Supermicro AOM Expansion Module Guidestates that thepower cable is the only non-data cablein AOM installations.

To remove theheatsink from the motherboard tray,a T30 Torx bit is required. This tool ensuresproper torque applicationandprevents damageto both the heatsink and the motherboard.

Why a T30 Torx bit is necessary?

Supermicro MI300X GPU systems use precision heatsink retention mechanisms.

Theheatsink screws are secured with factory torque settingsand require aT30 Torx bitfor safe removal.

Using an incorrect tool (Phillips screwdriver, T20, or T40) can strip the screw heads, making it difficult to remove the heatsink without causing damage.

Incorrect Answers Explained:

A (PH2 Phillips screwdriver)→ Not strong enough for heatsink screws, which requirehigh torquefor proper seating.

C (T20 Torx bit)→ Toosmall, risksstrippingthe screws.

D (T40 Torx bit)→ Toolarge, does not fit the heatsink screws.

Official Documentation Reference:

Supermicro MI300X Service Manualspecifies that aT30 Torx bitmust be used to remove the heatsinkwithout damaging the motherboard.

Why Are the Screws Equidistant?

Thebackplane in Supermicro MI300X systemsis alarge PCB (printed circuit board) that connects NVMe SSDs and PCIe devices to the motherboard.

It is secured byfour screws placed equidistantlyto:

Distribute mechanical stress evenly

Ensure stability against vibrations

Prevent warping or misalignment of connectors

Proper Removal of the Backplane Screws:

✅Step 1:Identify and locate the4 securing screws on the backplane.✅Step 2:Loosen them in across-pattern(diagonal pairs) to prevent stress buildup.✅Step 3:Carefully lift the backplanestraight upto avoid bending connector pins.

Why This Layout Is Important?

????Equidistant screw spacing ensures even pressure distribution, preventing PCB flexing or cracking.????Improper screw removal (one side first) can cause misalignment or undue stress on connectors.

Why False Is Incorrect?

IfFalse were correct, it would imply that screws are placedrandomly or unevenly, which isnot the case in Supermicro MI300X systems.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 Installation Manualconfirms thatthe backplane is secured with 4 evenly spaced screws for structural integrity.

Why Must PSUs Be Removed Before Midplane Removal? (Option A)

Power must be fully disconnectedbefore handling the midplane to avoidelectrical damage.

Themidplane is directly linked to the power distribution system, and removing it while PSUs are still connected can cause:

Short circuits

Residual electrical charge damage

Connector arcing and failure

Why Must PCIe, Motherboard, and GPU Trays Be Disengaged? (Option C)

These traysobstruct access to the midplane, meaning they must bedisengaged firstbefore midplane removal.

While they do not need to becompletely removed, they must beloosened and moved slightlyto allow for safe midplane extraction.

Why Other Options Are Incorrect?

B (Remove MCIO cables)→MCIO cables should be disengaged, but full removal is not requiredbefore midplane removal.

D (Remove fans and fan shutters)→ Fan assemblies are separate from the midplane anddo not need to be removedduring this step.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 Disassembly Manualexplicitly states thatremoving PSUs and disengaging trays are necessary steps before midplane removal.

When servicing theSupermicro MI300X GPU system, there are3 screwssecuring thebracket at the bottom of the motherboard trayin front of the backplane.

Purpose of these screws:

They secure the backplane’s structural integrityto prevent vibration-related failures.

Loosening them allows the removal or replacement of backplane componentssafely.

They prevent accidental disconnectionscaused by handling or system movement.

Why other options are incorrect?

A (13 screws)→ This number istoo highfor just the bottom bracket.

B (21 screws) & C (30 screws)→ These numbersapply to entire system disassembly, not just the bottom bracket.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 Disassembly Guidespecifies thatonly 3 screwsneed to be loosened to access thebottom bracket securing the backplane.

The SKU (Stock Keeping Unit) forSupermicro NVMe backplanesvaries depending on thespecific model and system configuration.

Thecorrect SKU for the NVMe backplane used in the Supermicro MI300X system differs from the given part number.

Referencingofficial Supermicro product sheets and service manuals, theBPN-NVME5-HS219N-S24 does not matchthe correct SKU for this system.

Official Documentation Reference:

Supermicro NVMe Storage System Compatibility Guidelists the correct SKU for MI300X GPU systems, confirming that the given SKU is incorrect.

Why Do Supermicro Systems Use Grooves for Alignment?

InSupermicro MI300X systems, themidplane bracket is aligned using built-in grooves in the chassis.

Ensures Perfect Alignment

The midplane mustline up perfectlywith power, PCIe, and data connections.

Grooves act as physical guides, ensuringprecise placementwithout guesswork.

Prevents Installation Errors

Without grooves, technicians mightinstall the midplane slightly misaligned, leading toconnection failures.

Ensures PCIe and MCIO lanes align correctly, preventing signal loss.

Supports a Tool-Free Installation

Grooves allowdrop-in installation, reducingmanual adjustments.

Minimizes risk of flexing or damaging the midplane PCB.

Why Other Options Are Incorrect?

A (Guide stickers in the chassis)→ Stickersmay be present for labeling but do not physically align the midplane.

C (Arrows in the chassis)→ Arrows arevisual indicators only, not physical alignment tools.

D (Velcro in the chassis)→ Velcro isnot used in midplane installation.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 Hardware Guideexplicitly states thatgrooves in the chassis help with midplane bracket alignment.

Removing themidplanein aSupermicro MI300X GPU systemrequiresdisengaging multiple system trays and power componentsbeforehand.

Why is this necessary?

Power must be fully disengaged before midplane removal

The midplane is directly connected topower distribution units (PDUs).

If power is not removed, it can causeshort circuits or hardware damage.

PCIe, motherboard, and GPU trays block access

These trays must be disengagedbefore removing the midplane, as they contain components directly connected to it.

Dummy PSUs must also be removed

Even inactive PSUs containlocking mechanismsthat must be disengaged.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 System Removal Guideconfirms thatPSUs, dummy PSUs, PCIe trays, motherboard trays, and GPU trays must be removed before handling the midplane.

Themidplane lid removal processis designed to betool-freeand follows aspecific sequence to avoid damage.

Thecorrect methodis:

Push in on the two handleslocated near thePCIe tray.

Slowly lift the midplane lid up, ensuring it does not catch on other components.

Remove the lid at an angleto avoid damaging adjacent connectors.

Why this method is used?

Theangled removalhelpsavoid contact with fragile connectorson the midplane.

Forcing the lid straight upcould damage PCIe slots or motherboard connectors.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 Disassembly Manualdetails thecorrect method for removing the midplane lid.

Thecorrect order for removing trays before midplane removalis:

Disengage the PCIe tray first

This tray must be removed first becauseit provides access to the underlying system components.

Remove the GPU tray

TheGPU tray sits between the PCIe and motherboard traysand must be disengaged after PCIe components are cleared.

Remove the motherboard tray last

The motherboard tray isthe final component before midplane removal.

Removing it lastensures full accessto the system componentswithout obstructing critical connections.

Why other options are incorrect?

B (Motherboard before GPU tray)→ The motherboard tray must be removedlastto avoid disconnecting system-critical connections too early.

C (Motherboard tray first)→ Removing the motherboard firstrisks damagingPCIe and GPU components.

D (GPU tray first)→ TheGPU tray is dependent on the PCIe tray being removed first, making this order incorrect.

Official Documentation Reference:

Supermicro AS-8125GS-TNMR2 System Removal Guideoutlines the correct order fortray disengagement before midplane removal.