The air shroud on the PCIe tray in Supermicro systems like the SYS-421GE-TNHR2-LCC is positioned to optimize airflow or assist liquid cooling efficiency in hybrid setups. Per Supermicro's design (e.g., SYS-
420GP-TNAR), the shroud is located on the top/center of the PCIe tray, covering the cards to direct cooling effectively across components. This central placement ensures even distribution, critical in DLC systems where air may still cool non-liquid-cooled parts. Options B and D (right/left) are less practical for uniform coverage, and A (bottom) contradicts standard shroud placement above components. Supermicro's DLC expertise integrates air shrouds strategically, making C the verified location.References:Supermicro PCIe tray diagrams, DLC solution design principles.

Internal fans in Supermicro systems, including the SYS-421GE-TNHR2-LCC, are typically secured to their housing with 4 screws, a standard design for stability and ease of replacement (e.g., SYS-420 series manuals).
This allows secure mounting while facilitating serviceability, key in DLC systems where fans support hybrid cooling. 6 screws (A) is excessive, 2 (D) insufficient for stability, and C (no screws) contradicts standard fan assembly. Supermicro's DLC expertise ensures practical fan maintenance, making B the verified number.
References: Supermicro fan installation guides, DLC system cooling component specs.

The training focuses on Supermicro'sDirect to Chip (DLC)liquid cooling, as indicated by the context of SYS-
421GE-TNHR2-LCC and Supermicro's expertise in DLC solutions (e.g., cold plates, CDUs up to 100kW).
DLC circulates coolant directly to CPUs/GPUs, reducing OPEX by 40% and supporting high-density racks. A (RDHx) cools via rear doors, B (Evaporative) uses evaporation, and C (ILC) submerges servers-none match Supermicro's DLC emphasis here. D is the verified type.References:Supermicro DLC whitepapers, SYS-
421GE-TNHR2-LCC cooling specs.