AMD Radeon RX5700 、 Radeon RX5700XT 動手玩,新架構、新氣象

2019.07.07 09:30PM
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AMD 的 CPU 在轉換到 Zen 架構後脫胎換骨,一步一步提升競爭力,演進到稍早解禁的 Ryzen 3000 系列已經有能與 Intel 頂級消費處理器一較長短的實力,而同時 AMD 的 Radeon GPU 也面臨全新的歷史轉捩點,也在此刻解禁的 Radeon RX5700 系列採用全新的 RDNA 架構取代 2011 年至今的 GCN ,而 RDNA 能否如 Zen 般脫胎換骨?也請見以下評測。

由於此次測試時間也受到工作時間影響,故無法完整評測兩款處理器組合,將使用 Ryzen 9-3900X 處理器,搭配技嘉 X570 AORUS MASTER 主機板,芝奇幻光戟 DDR4 3600MHz 記憶體單一平台搭配 Radeon RX5700 與 Radeon RX5700XT 交叉測試,同時撰寫當下發現部分測試數據基準設定有誤,但平台放置於假日無法出入的公司內,故其中幾項將會在 7 月 8 日午前更新。

取代 GCN 的 RDNA 架構首發產品

是AMD Radeon RX5700 、 Radeon RX5700XT 動手玩,新架構、新氣象這篇文章的第1圖

▲ RDNA 較 GCN 大幅改善能源效率

在 AMD 的產品定位當中, RX5700 系列的 Navi 架構仍在末代 GCN 的 Vega 之下,純論性能, RX5700 必然不會是 Radeon VII 的對手,然而由於大立大破的 RDNA 架構, Navi 仍有許多較 Navi 更先進的地方,尤其 AMD 指出 RDNA 同時脈較 GCN 提升 1.25 倍性能,而能源效率則提升 1.5 倍,這也意味著 RX5700 有望擺脫先前世代以大量電力換取效能的惡名。

RX5700 系列也是業界首度導入 PCIe 4.0 介面的消費級顯示卡,雖然以一般遊戲玩家的角度,更高的傳輸頻寬帶來的影響可能感受不太明顯,畢竟單卡 GPU 效能的限制通常不是 PCIe 頻寬不足造成,不過 PCIe 4.0 較 PCIe 3.0 有助降低 CPU 與 GPU 之間延遲,能微幅降低遊戲操控與遊戲畫面的遲滯-但也需要能感受這些現象的玩家與重視低延遲的遊戲才會察覺。

公版散熱結構維持鼓風、 RX5700XT 具備金屬背板

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▲官方版本包裝可感受到 RX5700XT 顯然豪華許多

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▲ RX5700 包裝為傳統軟紙盒搭配內盒, RX5700XT 則有著硬盒設計

此次測試的 RX5700 與 RX5700XT 皆為 AMD 公版設計,理論上台灣應該是不會有這樣的盒裝,不過首批市場通路上市的品牌版本理應也只有公版,故應該只有外包裝設計不同,而從外包裝設計,似乎也隱約感受 AMD 對兩款產品定位還是有些許落差的; RX5700 採用一般軟紙盒裝載,至於 RT5700XT 則是類似 NVIDIA 創始版包裝的上下打開硬紙盒。

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▲兩款公版僅有 RX5700XT 才有金屬背板

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▲ RX5700 並無背板設計

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▲ RX5700XT 有強化背板

雖然在當初記者會發表時, AMD 強調此次的 RX5700 系列採用全新的鼓風結構散熱器造型,不過實際上僅限高階的 RX5700XT , RX5700 的散熱器遮罩仍為 AMD 典型的方正設計,同時也沒有金屬背板設計。

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▲ RX5700 系列仍都維持鼓風設計

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▲ RX5700XT 遮罩尾端留有進氣開口

可看到 RX5700XT 相較 RX5700 散熱器視覺效果好了許多,同時風扇上的金屬遮罩也更為厚實,並有金屬背板降低顯卡變形,不過兩者的基礎都是傳統鼓風設計,而 RX5700XT 遮罩尾端採開放設計、 RX5700 則為封閉,這也意味著 RT5700XT 能從風扇上方與尾端進氣、 RX5700 則僅能由風扇上方進氣,不過拜 7nm 製程的低發熱,實際運作的噪音並不高。

官方 TDP 數據較假想敵偏高

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▲ RX5700 TDP 為 180W

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▲ RX5700XT TDP 為 215W

兩款顯示卡的公版皆採用 8+6 Pin 的供電,不過比較弔詭的是雖然是 7nm 製程,然而官方給出的平均 TDP 似乎比起停留在 12nm 製程的 NVIDIA 相近等級 GPU 高,官方規格表指出 RX5700 的 TDP 達 180W ,而 RX5700XT 則達到 215W ,雖然以當代 GPU 而言不算離譜,不過這也等同在整體散熱與電源供應器都需要較競品花點心思。

數據表現有水準演出

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▲ Ryzen 9 3900X + Radeon RX5700 @ 3DMark Fire Strike

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▲ Ryzen 9 3900X + Radeon RX5700 @ 3DMark Fire Strike Ultra

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▲ Ryzen 9 3900X + Radeon RX5700 @ Time Spy

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▲ Ryzen 9 3900X + Radeon RX5700 @ Time Spy Extream

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▲ Ryzen 9 3900X + Radeon RX5700 @ F1 2018

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▲ Ryzen 9 3900X + Radeon RX5700 @ 刺客教條:奧德賽

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▲ Ryzen 9 3900X + Radeon RX5700 @ 中土世界:魔多之影

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▲ Ryzen 9 3900X + Radeon RX5700 @戰慄深邃:流亡

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▲ Ryzen 9 3900X + Radeon RX5700 @ 末日 Z 戰 Direct X

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 末日 Z 戰 VULKAN

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▲ Ryzen 9 3900X + Radeon RX5700 @ 古墓奇兵

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▲ Ryzen 9 3900X + Radeon RX5700 @  Final Fantacy XV QHD

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▲ Ryzen 9 3900X + Radeon RX5700 @  Final Fantacy XV Full HD

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▲ Ryzen 9 3900X + Radeon RX5700 @火線獵殺:野境

在實際內容測試部分, RX5700 系列若以名稱來看應該還不是 Navi 家族的頂級產品,不過整體表現則能夠與 NVIDIA 的 RTX 2060 、 RTX 2070 相互抗衡,當然在針對 AMD 最佳化的內容如末日 Z 戰更有相當幅度的領先,其它的測試也與競品互有高低,甚至也有幾款內容得到比競品更高的純測試成績。(預計 7 月 8 日補上末日 Z 戰、古墓奇兵:暗影)

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 3DMark Fire Strike

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 3DMark Fire Strike

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 3DMark Time Spy

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 3DMark Time Spy Extream

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▲ Ryzen 9 3900X + Radeon RX5700XT @ F1 2018

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 刺客教條:奧德賽

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 中土世界:魔多之影

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 戰慄深邃:流亡

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 末日 Z 戰 VULKAN

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 末日 Z 戰 Direct X

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▲ Ryzen 9 3900X + Radeon RX5700XT @ 古墓奇兵

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▲ Ryzen 9 3900X + Radeon RX5700XT @  Final Fantacy XV QHD

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▲ Ryzen 9 3900X + Radeon RX5700XT @  Final Fantacy XV Full HD

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▲ Ryzen 9 3900X + Radeon RX5700XT @火線獵殺:野境

不過由於 RX5700 系列並未支援基於硬體的即時光線追蹤,故若考量到 2019 年到 2020 年不少大作會陸續導入即時光線追蹤,或許 RX5700 系列在視覺效果較相對少了點甚麼,但也由於光線追蹤技術會消耗大量的硬體資源,即便是競品 RTX 2060 、 RTX 2070 開啟效果,內容順暢度也或多或少受到影響,買一個純性能,或是買一個未來性就端看消費者抉擇。

RDNA 有好的開始、更期待接下來的發展

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▲ RX5700 公版輸出採三個 DisplayPort 搭配一個 HDMI

作為 RDNA 首發的 Navi 產品線的 RX5700 與 RX5700XT 有著不錯的開始,畢竟在 NVIDIA 自 Maxwell 、 Pascal 到現在的 Turing 世代,扣除挖礦外, AMD 在同時期的顯示卡已經有好一段時間在上市初期有顯著的競爭力,而此次的 RX5700 系列雖在整體功耗仍較假想敵偏高,不過確實在純性能的表現也不至於流於紙上談兵。

不過當前的 RX5700 系列也只是個 RDNA 架構的開始,產品線層級還不夠完整的情況下,下有 NVIDIA 的 GTX 16 ,往上還有 NVIDIA 的 RTX 2080 、 RTX 2080 Super 、 RTX 2080 Ti ,若考慮到市場消費習慣, AMD 的當務之急應該是要設法補齊與 GTX 16 相近價位帶的產品線,如此一來也能使產品普及增加。

同時,當前的第一世代 RDNA 可感覺到如當時第一世代 Zen 架構的情況,也就是感覺還有進步的空間,縱使光線追蹤內容的普及率還不夠,不過確實遊戲市場特效下一個聚焦的重點就是即時光線追蹤,也期待 AMD 接下來 RDNA 架構能更進一步提升功耗效能比,使其猶如 CPU 的 Zen 架構一樣為 AMD 在 GPU 重返榮耀。

初期市場售價必須面對競品通路週期性價格調整影響

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▲ RX5700 將對抗超頻版 RTX2060 、 RX5700XT 則鎖定超頻版 RTX2070

在 AMD 官方設定上, RX5700XT 的假想敵是 NVIDIA 的 RTX 2070 ,至於 RX5700 則鎖定 RTX 2060 ,但或許 AMD 也沒料到 NVIDIA 會在 Radeon RX5700 上市前夕公布 RTX Super 系列,最終 AMD 在稍早也宣布調整價格因應隔空殺出的競品。

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▲ RX5700 系列初期將僅有公版

在全新的價格設定後,如此一來基本定價 RX5700 約與 RTX 2060 接近,而 RX5700XT 則與 RX2060 Super 相同。至於台灣報價部分, RX5700 與非超頻版的 RTX2060 接近,由於 RTX Super 系列還未上架,故當前 RX5700 則略低於 RTX 2070 ,不過隨著 RTX Super 系列上市與 RTX 2070 、 RTX 2080 退場,當前市場庫存品應該還會有一波浮動。 

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▲版卡廠自製卡應該會有散熱架構更佳的設計

不過所有的新產品剛上市大致上都會面臨價格較死板的問題,且第一波的 RX5700 與 RX5700XT 還未有板卡廠的自製卡版本,若考慮更好的散熱性與超頻性,亦可等待後續自製卡上市後的各家廠商的大型散熱器設計。

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▲ RDNA 有著不錯的開始,盼能如 Zen 架構一樣打破 AMD 在 GPU 的僵局