Re: [情報] NVIDIA GTX970 海外玩家的退款聲浪
※ 引述《s13541298 (oh yeah!)》之銘言:
: 因為在evga進階升級專案裡排隊中~也是970,下禮拜就要付錢了
: 今天打給EVGA詢問關於3.5G的問題,EVGA回應說從NVIDIA那裡得知會釋出顯卡BIOS更新
: 會改善問題,
: 硬體是焊死的~的確是焊4G,只是軟體問題,不會動到硬體,不會做一個新版的970
: 這樣要全部回收產品
: 意思說硬體沒有縮水,只是軟體的問題?
: 我沒有錄音~
: 我對電腦實在沒什麼深的研究,只有問關於3.5G問題的部分
: 這樣的意思是說更新會解決問題,所以放心沒有問題~這樣嗎@@
: 謝謝
讓我們來看看AnandTech做的研究報告(原文第二頁):
http://ppt.cc/1oe4
直接搭配示意圖來作說明:
http://images.anandtech.com/doci/8935/GM204_arch_575px.jpg
在之前N社的聲明中提到:
Due to performance issues from the unbalanced ROP/MC partition, NVIDIA
segments the memory into a high-performance 3.5GB segment – what they refer
to as segment 0 – and a low-performance 512MB (0.5GB) segment containing the
rest of the RAM.
因為牆掉3組SM,ROP也相對要牆掉一些,過去的產品必須整個區塊的ROP/MC一起牆,
而GM204新特色就是可以只牆ROP,保留MC。所以GTX970一樣維持256bit位寬的記憶體控
制器,只是多出來的0.5GB記憶體會跟它的"兄弟"(同一區塊)共用同一組L2快取進入
crossbar http://images.anandtech.com/doci/8935/GTX970_ROP_575px.png
雖然GTX970有完整的256bit控制器,理論頻寬是224GB/s
還記得以前GTX660ti的故事嗎?複習一下
http://images.anandtech.com/doci/8935/GK104Memory_575px.png
這兩者情況有些類似,GTX970在32bit * 7 =196GB/s 的部分是全速沒問題
另外那28GB/s也是全速沒問題,但是,這兩個不會同時發生。
那已經買GTX970的不就很火嗎?端看你從哪個角度思考
GTX970的確存在完整的256bit記憶體控制器,搭配4GB VRAM
只是因為匹配SM的數目,牆掉一組ROP/L2
所帶來的影響是額外的0.5GB VRAM存取速度稍慢,但還是比存取system memory快兩倍
況且,一般用途很難榨到3.5GB的使用量
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其它就不翻了
我個人是比較喜歡買完整沒被閹掉的核心(superset)
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※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.136.61.36
※ 文章網址: https://www.ptt.cc/bbs/PC_Shopping/M.1422519676.A.760.html
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關於這點,所以nvidia對這件事一開始的回應大家還記得嗎?
他是展示了一些遊戲實際耗用記憶體以及畫面幀數下滑的幅度,與980作比較
他的結論是沒有明顯地因為這個問題而導致970下滑幅度大於980 (完整核心)
※ 編輯: check (223.136.61.36), 01/29/2015 16:40:46
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賓果!我個人就是這麼看待970這張卡的
至於它值不值得入手,就看C/P值,效能跟價格,就這樣。
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是阿,我不認為這是個BUG,這個頂多算一開始標示錯誤
把56個 ROP 標成 64個,但這屬於進階規格細節
只是若因此調降價格,倒是對玩家有利。 AMD就更慘了
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