引用:
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作者visionary_pcdvd
沒記錯的話
HT 是因為 x86 超純量管線高度平行化以後，執行單元多的用不完(或說使用率偏低)，Intel 為了提升管線使用率而開發的技術
只需增加約 5% 左右的製造成本(電晶體數量)就能讓一個核心同時執行兩個執行緒，也是 Intel 堅持把電晶體用在刀口上的偏執設計理念的實例之一...
但據說這種設計需要花費有如天文數字般的驗證成本，因此遠非研發經費相對有限的 AMD 所能辦到 
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Hyper Threading 跟intel沒關係, 唯一有關係的是 :
他出錢
http://www.wahas.com/viewthread.php?tid=476280
節錄重點 :
Intel在2002年11月所發表的新款Xeon處理器（研發代號：Prestonia）時，也一併發表一項新技術：超執行緒（HyperThreading），這項技術嚴格而論可以回溯到1997年由迪吉多電腦（DEC）與華盛頓大學的技術合作研究成果，之後由Intel買下DEC的半導體部門，並將此技術申請為自有專利，然而此技術的真正商業化運用卻一直到2002年11月，即便如此，該款Xeon依舊是全球率先使用多緒技術的處理器，甚至超越IBM。
怕中文網頁亂寫, 順手咕到英文wiki
http://en.wikipedia.org/wiki/Simult..._multithreading
節錄重點 :
While multithreading CPUs have been around since the 1950s, simultaneous multithreading was first researched by IBM in 1968.
The first major commercial microprocessor developed with SMT was the Alpha 21464 (EV8). This microprocessor was developed by DEC in coordination with Dean Tullsen of the University of California, San Diego, and Susan Eggers and Hank Levy of the University of Washington. The microprocessor was never released, since the Alpha line of microprocessors was discontinued shortly before HP acquired Compaq which had in turn acquired DEC.
Dean Tullsen's work was also used to develop the "Hyper-threading" (or "HTT") versions of the Intel Pentium 4 microprocessors, such as the "Northwood" and "Prescott".