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跟我的認知不太一樣
新的學習
Broadcom博通 為什麼這麼厲害? 尤其最近~
這就要從銅線的問題開始說了.....
•#Broadcom 的 #Manish#Mehta (VP of optical systems division)說:在現代 AI 系統中,銅線已經撐不住了。雖然像 #Nvidia 的 #NVLink 和 #AMD 的 #Infinity#Fabric 這些高速連接技術可以跑到 #900GB/sec,但問題是銅線只能傳輸 3 到 5 米,再遠信號就崩潰了。
•為什麼?因為 #SerDes 的傳輸速率現在已經超過 200Gbps,而這只會讓銅線的距離限制變得更短。想像一下,速度再快也沒用,因為連不到下一個機架!"What good is going fast if you can't get past the next rack?"
Broadcom 做了什麼? Broadcom 說:「把銅線換成光纖吧!」光學技術(optics)取代銅線是未來的方向,雖然光纖會增加功耗。如,Nvidia 的 #NVL72 系統 如果用光纖,功耗會從 120kW 增加到 140kW,但超級值得,因它讓高性能計算的連接距離不再受限。
The owner of a zoo was having a hard time attracting customers, so he lowered his price from $99 to $49, but no one came. He then lowered the price again from $49 to $29, but still no one. So, he put up a sign that read... ENTER TODAY FREE. The zoo quickly filled up. The zoo keeper then locked the gates, released his lions from their cages, and charged $500 to get out. Everyone paid.
Moral of the story: Nothing is free. Always respect the other side of the trade.