Comment 1 - Most likely it's not a full "Watson" but rather a network appliance that slots into a rack. Watson is powered by 2,880 8-core IBM POWER7 processors, which AFAIK haven't received a core bump or a die shrink since their introduction in 2011.
Comment 2 - POWER7 (which came out in 2009) was replaced by POWER7+ in 2012. IBM shrunk the lithography but kept the die size the same, so they used the extra space for more cache, a crypto accelerator, a compression/decompression accelerator, and some other goodies. There were able to bump up the clock speed as well.
Core for core, POWER7+ is about a 20% improvement, but you're right, no more cores per socket so there is no way they would see the kind of shrink described in the article if they kept the same amount of compute power.
IBM did come out with a new blade design (Flex Systems) with denser packaging, but that combined with the faster CPU will still only get them about 2/3rd of the way there (still impressive).
Honestly, look at the new MacPros. The computing power from even 10 years ago is amazing. WATSON will soon be software only for most standard servers. Looking at the SoftLayer acquisition in that light is very exciting.
Comment 1 - Most likely it's not a full "Watson" but rather a network appliance that slots into a rack. Watson is powered by 2,880 8-core IBM POWER7 processors, which AFAIK haven't received a core bump or a die shrink since their introduction in 2011.
Comment 2 - POWER7 (which came out in 2009) was replaced by POWER7+ in 2012. IBM shrunk the lithography but kept the die size the same, so they used the extra space for more cache, a crypto accelerator, a compression/decompression accelerator, and some other goodies. There were able to bump up the clock speed as well. Core for core, POWER7+ is about a 20% improvement, but you're right, no more cores per socket so there is no way they would see the kind of shrink described in the article if they kept the same amount of compute power. IBM did come out with a new blade design (Flex Systems) with denser packaging, but that combined with the faster CPU will still only get them about 2/3rd of the way there (still impressive).