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Lot 615

CRAY 3 DEMONSTRATION KIT.
Demonstration kit containing a Cray 3 memory module and the following components:

5 December 2018, 14:00 EST
New York

Sold for US$4,375 inc. premium

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CRAY 3 DEMONSTRATION KIT.

Demonstration kit containing a Cray 3 memory module and the following components:
1. gallium arsenide die
2. SC die
3. SM die (2)
4. Logic Spacer
5. Logic Board with gallium arsenide die and flex connectors
6. Memory spacer
7. Memory board with SM die and capacitors attached
8. Twist pins
9. Power pins
10. Cray Computer Corporation Cray-3 Supercomputer Systems brochure.
All housed in custom plastic case.

The Cray 3 was the first offering of the Cray Computer Corporation, Seymour Cray's spin-off from Cray Research, Inc., the company that he created in 1972 after he left Control Data Corporation. The Cray 3 was the first supercomputer to use gallium arsenide integrated circuits for all of its logic circuitry and was the fastest computer of its time. The changing political climate at the end of the cold war drastically shrank the supercomputer market and much of the market turned to massively parallel designs. Cray ended up loaning a Cray 3 to the National Center for Atmospheric Research (NCAR) and another government order the company received was cancelled.
This kit was created for prospective clients demonstrating the construction of the complex three-dimensional Cray-3 modules. From the brochure: "The Cray-3 logic and memory circuitry is packaged in up to 336 removable modules, each containing up to 1,024 GaAs integrated circuit die. Total integrated circuit population in a 16-processor Cray-3 is over 142,000 die, of which 36,864 are for common memory. The packaging results in a GaAs gate density of approximately 96,000 gates per cubic inch. The modules are three-dimensional structures measuring 121 mm by 107 mm by 7 mm. Nine printed circuit boards make up the module sandwich and contain a total of 69 electrical layers. Circuit connections are made in all three dimensions within the module. X-y traces are as small as 0.048 mm. Z-axis connections are made with approximately 14,000 gold-plates, beryllium-copper twist-pin jumpers per module. The logic signal jumpers, which make up the bulk of the z-axis connections, are only 0.122 mm in diameter."
This is the only existing kit showing the component parts of the Cray-3 Module and likely some of the only remaining component parts of this project. It comes from a longtime associate of Seymour Cray and an employee of Control Data Corporation, Cray Computer Corporation and SRC Computer.

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