In the nine months ending September 30, 2013, sales of IBM's microelectronics unit fell about 3%, and we estimate that the unit generated about $1.75 billion in revenue last year, while losing $130 million in pretax income. We predicts the unit will shrink to $1.45 billion in revenue in 2014, while losing another $130 million in pretax income.
- Toni Sacconaghi, an analyst at Sanford C. Bernstein
這次IBM有意脫手的是後端的晶圓廠,前端的IC設計仍會保留。說到這,附帶一提其自有自製的Power處理器,曾驅動過PC(Apple Mac)、工作站(IBM Powerstation)、遊戲機(SONY PS3、Nintendo Wii、Microsoft XBox)、跟電視機(Toshiba Cell Regza),現在則是IBM產品的獨門絕活。
看看monstrous的Power 8,對比主流處理器的幾個指標數字:
單一晶片上有12核心,每一核內有96KBL1+512KBL2+8MBL3快取,L1及L2共享512-bit 匯流排,其前端是16個EU,每周期內可發射10道指令跟分派其中8道,每核心可同時執行8個thread,聯外記憶體吞吐量是230GB/s。
cache bus bandwidth in Power 8@4GHz
L1 → L2 :64GB/sec
L2 → L1 :256GB/sec
L2 → L3 :128GB/sec
L3 → L2 :128GB/sec
L3 → L4 :64GB/sec
L4 → L3 :128GB/sec
以22nm SOI製程打造,Power8的die size達650mm²,從上面的示意圖目測,每CPU核心面積大於搭配的8MBL3,甚至直逼L2+L3面積,每CPU核心含L1大約是20~25mm²,對比於20nm的AMD Jaguar每核心2.2mm²,這級數可大有差異。
