That year, Apple Computer Inc. (as Apple was known at the time) was only six years old, and Oracle Corp. just five. It was a time when the Valley was really taking off as a high-tech hotbed, and SGI had as much potential - and early success - as vendors like Sun did. The company's revenue peaked at $3.66 billion in its 1997 fiscal year, and the maker of high-performance computing (HPC) systems acquired some 700 patents as well as many large customers.

And even as SGI unraveled this year, continuing to lose money, laying off workers and facing a delisting of its stock by Nasdaq, some of those big users continued to buy its products. For instance, two months before the Rackable buyout announcement, SGI said it had received a $40 million, multiyear contract to provide HPC systems and storage equipment to the U.S. Department of Defense.

But now, such customers are in limbo.

One longtime user is the University of Minnesota Supercomputing Institute, which has been using SGI systems since the late 1980s. Gabe Turner, a system administrator in the HPC group at the Minneapolis-based institute, said he doesn't know how the sale of SGI to Rackable will affect him.

"My biggest concern is the support, and specifically what will happen to the support contracts," Turner said. "We've got support contracts that are just a little over a year old, and what is the state of SGI going to be two years from now? I just have no idea."

SGI never really regained its footing after a bankruptcy filing in 2006. The company tried to adapt by shifting its focus to x86-based systems running Linux and Windows, in hopes of expanding its market reach. But its losses continued; SGI finished the fiscal year that ended last June with a $153 million net loss on revenue of $354 million, and it lost $82.9 million in the first half of the current fiscal year.

In a new bankruptcy filing earlier this month in U.S. Bankruptcy Court in New York, SGI said its business model was based on direct sales. "The shift to standardization in the computing industry, however, has favored companies with high-volume sales through resellers and channel partners," it added.