AMD RX480 8GB 零售價為229美金 - 3C

By David
at 2016-06-21T17:33
at 2016-06-21T17:33
Table of Contents
推 obov : 5.8TFLOP@@??? 06/21 14:06
推 obov : 數字越來越唬爛 本來不是只說>5 06/21 14:10
→ obov : 每次要開賣之前都會唬爛道一葛極致 然後失望被罵 06/21 14:10
推 RealJeremi : FLOPS不是算出來的嗎?2304*2K*1266=5.83T 06/21 16:20
→ RealJeremi : 唯一的變數是時脈 shader數基本已經公佈了不是? 06/21 16:22
先說明一下我這是在回教主,避免誤會 → vobor : 那個2K是怎麼來的..? 06/21 16:28
至於 2K 怎麼來的要看這:
https://en.wikipedia.org/wiki/FLOPS
FLOPS = floating-point operations per second
基本上是純浮點數運算能力上數值
(GPU 上還有 TMU、ROP 等項目會影響實際效能表現
不過跟這邊沒什麼關係就先不細就了)
計算上就是
FLOPS = 時脈 * 每個時脈的FLOP
每個時脈的 FLOP 跟架構有關
wikipedia 上的例子像是 Haswell 到 Skylake 單精度是32
而 GCN 上的數值可以看:
https://en.wikipedia.org/wiki/List_of_AMD_graphics_processing_units
仔細看有注釋
Single precision performance is calculated as two times
the number of shaders multiplied by the base core clock speed
得到 GCN 每個時脈的 FLOP 是 2
用 390X 驗證一下:
390X 的 Core conifg 是 2816:176:64 時脈 1050
FLOPS = 2,816(shaders) * 1,050(MHz) * 2 = 5,913,600 MFLOPS
跟表上的 5913.6 GFLOPS 吻合
回到 480
目前已知 Shader 為 2,304 (這應該是確定了吧? 有誤見諒)
流出的資訊看來公版卡的時脈是 1,120(base)-1,266(boost)
所以計算上就是 2,304 * 1,120 (1,266) * 2 = 5,160,960 (5,833,728)
*更新了 base 時脈
2K 的 K 請忽略,那個只是在移小數點而已,算是誤植
(原本是想 2.304 * 1.266 * 2K 算出來會是 GFLOPS 這樣)
--
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