Senior Mechanical Engineering Project Definition

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Senior Mechanical Engineering Project Definition

• Mike MacGregor

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Problem Statement Scope

• Problem Statement Need to enable Larrabee PCI
  graphics card by designing a cooling solution
  that meets
• Volumetric/dimensional constraints of the PCI
  card form factor as well as the chip and circuit
  board that it cools
• PCI Express x16 Graphics 150W-ATX Specification
  Revision 1.0 PCIe 2.0 Spec Compliant
• Card form factor 2 slot, Full height, 240mm
  length
• Thermal performance requirements of the Graphics
  Processor Unit (GPU) under a worst-case use
  condition
• Structural performance requirements driven by
  shipping and handling use condition
• Scope
• Fan thermal test vehicle to be supplied by
  Intel
• Competitive research, feasibility analysis,
  quantitative evaluation of multiple design
  concepts, identification of final design concept,
  detailed design and design analysis, validation
  through laboratory testing

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Thermal Acoustic Requirements

• GPU Thermal Design Power (TDP) 70 Watts
• Fan max. power 8 Watts
• Max. T ambient 35 C
• Typical T ambient 25 C
• T rise to card inlet 10 C
• GPU T case max. 85 C

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Constraint 1 Fan

• 5 fans to be supplied by Intel
• Fan supplier AVC
• Fan model series BA10033

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Constraint 2 Thermal Test Vehicle (TTV)

• Heater to be specd from Omega supplier catalog
• KHR-3/10 (3 cm diameter, 70 W max.)
• http//www.omega.com/pptst/KHR_KHLV_KH.html
• PCI card with assembled heater and heat spreader
  to be supplied by Intel

PCI Card
?3cm TTV
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Structural Requirements

• Design must pass shock test
• PCI card assembled with ATX MB to rigid plate
  with rear panel I/O bracket (see backup slides)
• Hockey stick max retention force 29 lbf
• Shock test input in all 6 directions trapezoid,
  30g amplitude
• Expectations
• derivation of worst-case DAF for HS mass
• disposition of which shock directions pose the
  greatest risk to SJR as well as RM component
  loading
• estimation of max stress and deflection of RM

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BACKUP
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Starting Materials SV Fixture and MB (not
pictured)
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Step 1 Install MB

• Install the MB onto the fixture with qty 10, 6-32
  screws torqued between 6 to 10 in-lbf

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Step 2 Install Card

• Seat the card into the PCI x16 connector and
  check that the hockey stick feature is engaged
• Install the qty 2, 6-32 screws torqued between 6
  to 10 in-lbf to secure card to I/O bracket