繼 Ryzen 5000 系列處理器，AMD 正式公開 RDNA 2 架構代號 Big Navi 的 Radeon RX 6000 系列 GPU，繼續使用台積電 7nm 製程，引進全新 Infiniy Cache 技術，首波推出 RX 6900 XT / RX 6800 XT / RX 6800 等三款，售價分別為 US$ 999 / 649 / 549。
Infiniy Cache 最主要的目的當然是加大記憶體頻寬，這也是遊戲極為需要的性能，透過這個技術搭配 256-bit GDDR6 記憶體，可帶來 384-bit 記憶體 2.7 倍的頻寬，但只需要 90% 的功耗。
架構方面，RDNA2 相較於前代 RDNA 的每瓦效能增加 54%，同樣功耗下可增加 30% 時脈，因此可提供 RX 5700 XT 的兩倍效能。
另外，AMD 推出名為 Rage Mode 的一鍵超頻模式，若搭配 Ryzen 5000 系列還能開啟 Smart Access Memory。RX 6800 XT 透過 Smart Access Memory 和 Rage Mode 加乘後，效能可增加 4% ~ 13%。
AMD Radeon RX 6000 系列規格
| 產品 |
RX 6900 XT |
RX 6800 XT |
RX 6800 |
| 運算單元 |
80 |
72 |
60 |
| 光線加速器 |
80 |
72 |
60 |
| 串流處理器 |
5120 |
4608 |
3840 |
| Game Clock |
2015 MHz |
2015 MHz |
1815 MHz |
| Boost Clock |
2250 MHz |
2250 MHz |
2105 MHz |
| 單精度浮點效能 (FP32) |
23.04 TeraFLOPs |
20.74 TeraFLOPs |
16.17 TeraFLOPs |
| 半精度浮點效能 (FP16) |
46.08 TeraFLOPs |
41.47 TeraFLOPs |
32.33 TeraFLOPs |
| Infiniy Cache |
128 MB |
128 MB |
128 MB |
| 記憶體型式 |
256-bit 16GB DDR6 |
256-bit 16GB DDR6 |
256-bit 16GB DDR6 |
| 記憶體速率 |
16Gbps |
16Gbps |
16Gbps |
| 記憶體頻寬 |
512 GB/s |
512 GB/s |
512 GB/s |
| TDP |
300W |
300W |
250W |
| 公版長度 |
267 mm |
267 mm |
267 mm |
| 工板厚度 |
2.5 槽 |
2.5 槽 |
2 槽 |
| 定價 |
US$ 999 |
US$ 649 |
US$ 549 |
| 上市時間 |
12 月 8 日 |
11 月 18 日 |
11 月 18 日 |
Radeon RX 6900 XT 為本次的最高階款式，效能在 Smart Access Memory 和 Rage Mode 加乘過後與對手的 GeForce RTX 3090 互有勝負，但售價相對便宜許多，只要 US$ 999，開賣時間較晚，12 月 8 日上市。
而 Radeon RX 6800 XT 的對手當然是 RTX 3080，不經過 Smart Access Memory 和 Rage Mode 加成也能和 RTX 3080 旗鼓相當，售 US$ 649，11 月 18 日上市。
至於 Radeon RX 6800 搭配 Smart Access Memory 效能可凌駕於 RTX 2080 Ti 或 RTX 3070 之上，售 US$ 549，11 月 18 日上市。
歷經效能不彰的 RX 5000 系列後，AMD 總算有一款 GPU 看似能追上 NVIDIA 了，但實際性能究竟如何，請靜待我們的詳細測試。
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