求助 - 该选哪个系统？32bit or 64bit?

正在网上订下面这个ThinkPad, 不知选那个系统好，32bit 还是 64bit? 如果选4GB DDR3 SDRAM 就只能用64bit的系统，是吗？Intel Core 2 Duo Processor P8600支持64bit吗？

大家还有更好的Deal推荐吗？谢了！

ThinkPad T400 - $704

Intel Core 2 Duo Processor P8600 (2.40GHz 1066MHz 3MBL2) 25W
Genuine Windows 7 Home Premium 32
14.1 WXGA TFT, w/ CCFL Backlight
Intel Graphics Media Accelerator 4500MHD with vPro
3 GB PC3-8500 DDR3 SDRAM 1067MHz SODIMM Memory (2 DIMM)8
UltraNav (TrackPoint and TouchPad)
250 GB Hard Disk Drive, 5400rpm4
DVD Recordable 8x Max Dual Layer, Ultrabay Slim (Serial ATA)5
No Bluetooth
Intel WiFi Link 5100 (AGN) with My WiFi Technology10
Integrated Mobile Broadband upgradable
6 cell Li-Ion Battery60
7417: 1 Year Depot Warranty - TopSeller7

所有跟帖： 

• 回复：略说一二 -NaCl- ♂ (377 bytes) () 11/25/2009 postreply 19:00:06

• 说得明白，多谢指教！！ -股气东来- ♀ (0 bytes) () 11/25/2009 postreply 19:20:25

• 俺有个T61,奉送一套WIN7 ULTIMATE 用了一年，400要吗？ -coorslight969- ♂ (39 bytes) () 11/25/2009 postreply 22:27:44

• 回复：奉送? 借花献佛吧. -NaCl- ♂ (0 bytes) () 11/26/2009 postreply 05:07:38

• Buy one get one free -Coorslight969- ♂ (0 bytes) () 11/26/2009 postreply 07:16:03