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曾任惠普首席技術官的喬爾·伯恩鮑姆這樣評價克雷：「克雷對超級計算機行業的發展功不可沒。現在高性能計算機的許多功能在克雷那個時代看來都是不可思議的，而克雷卻能將高性能計算機構想出來。」<ref>{{cite web|url=httphttps://researchwww.microsoftcray.com/userscompany/gbellhistory/craytalk/sld078.htmseymour-cray |title=Quote by Joel BirnbaumSeymour Cray (1925-1996) |publisher=Cray Inc. |accessdate=2018-09-10 | quote = | language = en}} 英文原文為：「It seems impossible to exaggerate the effect he had on the industry; many of the things that high performance computers now do routinely were at the farthest edge of credibility when Seymour envisioned them.」</ref>曾任美國伊利諾大學國家超級電腦應用中心總監的拉里·斯馬說道：「他（克雷）是超級計算領域的托馬斯·愛迪生。」{{notetag|英文原文為：「He [(Seymour Cray] ) is the Thomas Edison of the supercomputing industry.」}}