Have they tried to ask the Chinese scientists? I heard rumors that the Yinhe (银河, the Milky Way in Chinese) I supercomputer was kinda `compatible' with Cray I.
Although I have never seen either of the two, I have heard rumors that people claimed that the Yinhe-I was actually cloned Cray-I. Considering that the subtle equilibrium among north east Asian countries, the Soviet and the U.S. during the Cold War and that China was used by the U.S. as leverage to neutualize the influence of the Soviet, after Richard Nixon's visit, and before the eventual collapse of the Soviet Union, maybe the Chinese clones were even closer to the genuine ones than the Soviet Bloc computer systems.
http://books.google.com.hk/books?id=nmz5nDJAYGMC&pg=PA21&lpg...
EDIT:
Yinhe-I
http://2.bp.blogspot.com/_FCZ3U_VuvpU/TKQ8UA0bFXI/AAAAAAAABd...
Cray-I
https://1.bp.blogspot.com/_FCZ3U_VuvpU/TKQ9BamNTFI/AAAAAAAAB...