Re: [情報] GTX 970 記憶體疑似只吃得到 3.5GB (官方回應)

看板PC_Shopping (個人電腦購買)作者iHakka (iHakka)時間11年前 (2015/01/25 16:10)推噓5(5推 0噓 19→)

留言24則, 8人參與討論串3/3 (看更多)

在Fermi架構下跑出來的值會超高是因為兩個原因 1.編譯時編成m32的版本，沒辦法吃到4G以上記憶體 2.編譯時編成限定kepler以上架構，導致在fermi上不能跑所以程式會因為出錯立刻結束，讓執行時間超級短以至於算出來的頻寬會爆高！！基本上我是認為程式沒有問題我幫大家編譯了可以在fermi以後世代的卡上跑的程式 http://goo.gl/v7Ogq6 http://goo.gl/fKGHcp 那個因為不能上傳執行檔，下載後把尾巴的_去掉即可編譯環境是CUDA 7.0RC，所以需要第二個連結的dll檔案一起下載下來有漏掉什麼dll的話我在補上來 ------ 補上測試結果 http://i.imgur.com/1gbIaBI.png?1 當存取到末端的記憶體時L2 cache的使用量會整個掉下來原因我就不清楚了，但底是driver還是OS或是硬體的問題 ※ 引述《yummypixza (好吃的披薩)》之銘言： : NVIDIA Responds to GTX 970 3.5GB Memory Issue | PC Perspective : http://goo.gl/u8ZxN6 : 以下原文新聞稿, 中文有請翻譯蒟蒻 : --- : The GeForce GTX 970 is equipped with 4GB of dedicated graphics memory. : However the 970 has a different configuration of SMs than the 980, and fewer : crossbar resources to the memory system. To optimally manage memory traffic : in this configuration, we segment graphics memory into a 3.5GB section and a : 0.5GB section. The GPU has higher priority access to the 3.5GB section. : When a game needs less than 3.5GB of video memory per draw command then it : will only access the first partition, and 3rd party applications that measure : memory usage will report 3.5GB of memory in use on GTX 970, but may report : more for GTX 980 if there is more memory used by other commands. When a game : requires more than 3.5GB of memory then we use both segments. : We understand there have been some questions about how the GTX 970 will : perform when it accesses the 0.5GB memory segment. The best way to test that : is to look at game performance. Compare a GTX 980 to a 970 on a game that : uses less than 3.5GB. Then turn up the settings so the game needs more than : 3.5GB and compare 980 and 970 performance again. : --- : 官方回應出來了 : 簡單來說就是他們的硬體設計執意如此 : "It's by design, not a bug" : 雖然他們自己說實際上在存取最後0.5GB的效能遞減並不嚴重 : 但是實際上真的會把4GB都塞到炸掉的人應該也大都不是普通人了... : 到底最後大家買不買帳就(ry : #ramgate : edit: 將來源網址縮址 :P -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.114.213.123 ※ 文章網址: https://www.ptt.cc/bbs/PC_Shopping/M.1422173437.A.9ED.html

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john0312

01/25 16:13, , 1^F

01/25 16:13, 1^F

※ 編輯: iHakka (140.114.213.123), 01/25/2015 16:47:20

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mayjan

01/25 16:55, , 2^F

01/25 16:55, 2^F

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