D.03/000/0/0/2/208-480VAC 昨晚AMD發布了RX6700XT顯卡，這是RDNA2架構家族波產品，國內售價3699元，針對友商的RTX3070顯卡。
在AMD的RDNA2架構中，有一項獨特的技術很重要，那就是InfinityCache（無限緩存），這是一種高速緩存，靈感來自于Zen架構CPU，它能夠以低功耗和低延遲提供的帶寬性能。
整個顯卡核心均可訪問此全局高速緩存，有助于捕捉即時的重用機會，從而能夠快速訪問數據。
根據AMD的說法，InfinityCache充當著海量帶寬放大器的角色，實現的有效帶寬可達256位16GbpsGDDR6的3.25倍。
在RX6800/6900系列顯卡上，AMD就靠著128MBInfinityCache+256bitGDDR6顯存的方案相比傳統的384bitGDDR6顯存帶寬翻倍，而且功耗還更低。
在RX6700XT的Navi22核心上，AMD的InfinityCache砍了一部分，只剩下96MB，匹配192bit位寬。
未來還會有Navi23核心，顯卡對應的應該是RX6600系列，那它的InfinityCache技術會不會砍掉呢？畢竟成本還是挺高的。
是不會，已經有網友在Linux代碼中發現了線索，Navi23會給每個顯存通道分配4MBInfinityCache緩存，而顯卡應該是128bit位寬，也就是8個32bitGDDR6，所以InfinityCache容量會減少到32MB。
總之，這個技術對提高帶寬很有幫助，雖然成本高了點，但AMD依然會保留在低端的Navi23核心上，RX6600系列顯卡也不會太狠。
D.03/000/0/0/2/208-480VAC
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