1

Visual Computing

Group

Senior Mechanical Engineering Project Definition

Mike MacGregor

2Visual ComputingGroup

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

3Visual ComputingGroup

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

4Visual ComputingGroup

Constraint #1: Fan

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

Adobe Acrobat Document

5Visual ComputingGroup

Constraint #2 Thermal Test Vehicle (TTV)

Heater to be spec’d 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

3cm3cmTTVTTV

PCI CardPCI Card

6Visual ComputingGroup

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

(0,0)(0,0)

acce

lera

tion in

g’s

acce

lera

tion in

g’s

msecmsec

(3,30)(3,30) (16,30)(16,30)

(19,0)(19,0)

7Visual ComputingGroup

BACKUP

8Visual ComputingGroup

Starting Materials: S&V Fixture and MB (not pictured)

9Visual ComputingGroup

Step 1: Install MB

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

10Visual ComputingGroup

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