LopinKuo wrote:
G.F 兄, 你那篇關於 Phenom 的大作很精采.
不過,關於 "Unganged 和 Ganged都是雙通道" 的訊息是從何得知?
我的工作跟desktop有關(我不是技嘉的員工 冒汗),根據我從 AMD 所得到的訊息是,
只有 Ganged mode 才能跑128-bit bandwidth, Unganged mode 只有 64-bit bandwidth.
Unganged mode 並不是 64 + 64 = 128-bit bandwidth....(恕刪)
從官方的技術文件，讓板卡廠寫BIOS用的，其他這次不少板子的BIOS都寫錯了，不然就是沒有導入完全，但這不全然是板卡廠的問題，因為AMD也沒給什麼支援-_-。
BIOS and Kernel Developer's Guide (BKDG) For AMD Family 10h Processors
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116.pdf
A DRAM channel is the group of the DRAM interface pins that connect to one series of DIMMs. The processor
supports two DDR channels. The processor includes two DCTs. Each DCT controls one 64-bit DDR DIMM
channel.
For DDR products, DCT0 controls channel A DDR pins and DCT1 controls channel B DDR pins. However,
the processor may be configured: (1) to behave as a single dual-channel DCT; this is called ganged mode; or
(2) to behave as two single-channel DCTs; this is called unganged mode.
A logical DIMM is either one 64-bit DIMM (as in unganged mode) or two identical DIMMs in parallel to create
a 128-bit interface (as in ganged mode). See section 1.5.2 [Supported Feature Variations] on page 20 for
information about supported package/DRAM configurations.
所以Unganged就是兩個DCT分別控制64bit的channel，但同時啟動，讓它具備相當於64x2 = 128bit的頻寬，不是雙通道，是兩個單通道一起運作。
