傳Xbox One的ESRAM實際效能比預期高許多 - XBOX

By Poppy
at 2013-06-28T22:53
at 2013-06-28T22:53
Table of Contents
http://www.eurogamer.net/articles/digitalfoundry-xbox-one-memory-better-
in-production-hardware
http://tinyurl.com/ofhaw86
Xbox One使用延遲低但頻寬較少的8G DDR3為記憶體,
而PS4使用傳輸頻寬很大8G GDDR5為記憶體,
比起GDDR5的176 GB/s傳輸頻寬,DDR3只有68 GB/s,
為彌補其中差距,所以Xbox One加上32MB理論傳輸頻寬最高有102.4 GB/s的ESRAM來協助,
不過有個知名開發商來源告訴Digital Foundry,隨著最終成品的晶片逼近,
微軟修改了他們的規格數據,ESRAM的理論最高傳輸頻寬現在是 192 GB/s,
數字整整提高了88%。
那微軟當初為何會做出誤差這麼大的低估呢?根據聽過微軟簡報的來源表示,
當初微軟是以 每個區塊128 byte 乘上 GPU 800MHz而得出最高102.4 GB/s的數據
然而以讀取、寫入的操作分開進行來說,這個數字會是正確的,
但是微軟發現到實際硬體是讀取、寫入是同時進行,所以可以進行更多次的操作,
因此理論值會爆升到192 GB/s,然而理論是一回事,
實際運作時,配合半透明混合(FP16 x4)操作,能達到133 GB/s表現,
還是比以前的理論峰值高出不少。
--
in-production-hardware
http://tinyurl.com/ofhaw86
Xbox One使用延遲低但頻寬較少的8G DDR3為記憶體,
而PS4使用傳輸頻寬很大8G GDDR5為記憶體,
比起GDDR5的176 GB/s傳輸頻寬,DDR3只有68 GB/s,
為彌補其中差距,所以Xbox One加上32MB理論傳輸頻寬最高有102.4 GB/s的ESRAM來協助,
不過有個知名開發商來源告訴Digital Foundry,隨著最終成品的晶片逼近,
微軟修改了他們的規格數據,ESRAM的理論最高傳輸頻寬現在是 192 GB/s,
數字整整提高了88%。
那微軟當初為何會做出誤差這麼大的低估呢?根據聽過微軟簡報的來源表示,
當初微軟是以 每個區塊128 byte 乘上 GPU 800MHz而得出最高102.4 GB/s的數據
然而以讀取、寫入的操作分開進行來說,這個數字會是正確的,
但是微軟發現到實際硬體是讀取、寫入是同時進行,所以可以進行更多次的操作,
因此理論值會爆升到192 GB/s,然而理論是一回事,
實際運作時,配合半透明混合(FP16 x4)操作,能達到133 GB/s表現,
還是比以前的理論峰值高出不少。
--
Tags:
XBOX
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