"H700可以不用掛電池?"
你可以選擇不使用BBU...
不過這樣就比較奇怪..
因為DELL的BBU沒有說很貴..
加掛BBU主要是針對使用WB的情況下..

When write processing is requested from software such as OS, in Write Back mode, data is written to the cache in the RAID controller and to the HDD by the RAID controller asynchronously based on the data on the cache.
Since completion notification is issued to the software when data is written to the cache, the software can continue processing without having to wait for completion of the HDD write processing.
In general, access performance is improved by Write Through. However, since the contents of the cache may not reflect in the HDD at the occurrence of an unexpected accident such as a temporary power failure, the data may be lost.

待留在Hot Data buffer上的資料稱為dirty cache...

"另外512M跟1G NV又有什麼明顯的差異?"
1GB主要是提供CTF-NVCACHE的機能
Cache-to-Flash NVCACHE
您可以參考此篇的ZMCP設計:
http://www.cublog.cn/u3/95474/showart.php?id=2318596
達到的目標是一樣的..
差別是DELL H700那張只有提供BBU的方案..
沒有Super cap.

"另外, 線材方面有什麼要注意的呢?
以H700而言~
要直接入手SAS/SATA雙用線?
還是只要單SATA功能就好?"
只要確定一點..
你有掉接上backplane??