規格上 有支援 但是因為有BUG 卻無法開啟

所以 才會推出C1修正版

老版的B-1步進的Pentium D 9xx處理器由於存在設計缺陷，在啟用EIST等節能技術之後會 造成系統的掛起，而且此問題無法通過刷新 ... C-1步進的Pentium D 9xx處理器解決了這 一問題。

http://publish.it168.com/2006/0220/20060220212601.shtml

http://en.wikipedia.org/wiki/Pentium_D
http://www.intel.com/products/proce...ium_D/index.htm
http://www.intel.com/products/proce...d/prodbrief.pdf
http://www.intel.com/design/PentiumD/documentation.htm

Presler

The newest generation of Pentium D processors are based on the Presler core, a pairing of "Cedar Mill" cores. Even though Presler is a single package, that package has two die in it, enhancing manufacturing yields of the processor over a single die approach. Presler can be supported by the same chipsets as Smithfield. It is produced using the 65 nm technology. Presler communicates with the system with an 800 MHz FSB (while the Pentium Extreme Edition 955 uses a 1066Mhz FSB), and the two cores communicate using the FSB, just as Smithfield does. It also includes VT (Virtualization Technology, aka Vanderpool), EM64T, XD bit and EIST (Enhanced Intel SpeedStep® Technology)¹. It was released in the 1st quarter of 2006 at models 920, 930, 940 and 950 (2.8, 3.0, 3.2 and 3.4 GHz).

¹ - First batch of Presler CPUs (revision B1) have EIST feature turned off by microcode update because of stability issues. This affects only idle power consumption and thermal dissipation so it is not much of an issue. Chips with working EIST will start shipping in Q2 2006. They will have different S-Spec number which can be found in Intel errata documentation.

http://www.thg.com.tw/article_000105703.html

B1 版有支援 EIST ，盒子上不是有寫，
主機板若有支援並且在開啟的狀態下，在
MS 視窗模式會自動調整核心頻率， 3.0G
有時後會變成 2.8G 在跑。

B1 廢掉的是 c1e 以及 tm2 ，其實三者合一
才能達到最佳的狀態。