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If you want to compare the two processors, you can compare them on the following link:http://ark.intel.com/Compare.aspx?ids=27256,27257,29739,27518,
Processors are sold in two different types: boxed and tray. Boxed processors are for customers to buy however tray processors are mostly sold to OEM manufacturers and integrators who build systems. From this link you can notice that the processor with the SL9SJ with the FCBGA socket is only available as a tray processor rather than a boxed processor.; http://ark.intel.com/product.aspx?id=27257&code=Intel%C2%AE+Core%E2%84%A22+Duo+Processor+T7600+(4M+Cache%2c+2.33+GHz%2c+667+MHz+FSB) . However the other SL9SD is available in both boxed and tray but only in FCPGA. These processors have already been discontinued, meaning that Intel has stopped producing them however you may still find it at some computer shop which still have some remaining.
My advice is when you are buying a processor, always by a boxed version. Also just for your information, warranty for tray processor is different as they are sold only to OEMs.
In you case you may also need to contact Fujitsu to check with them if you can upgrade your processor first before you buy.
Thats helpful i didn't realize that the code refered to the method by which a processor was shipped. Still not sure of the answer though. Will a ball grid array work in my 945GM Express chipset? And second is it worth it to get the T7600 vs the T7400?
Oh and my warranty is looooong gone, So no worries about fujitsu!