Sun StorageTek(TM) 9990 Cache Data Path Expansion Kit; consists of 2 PCBs that install the cache memory module. Cache memory module (TJ9DKCF510I-C4GR/C8GR) can be installed in this option. However, TJ9DKCF510I-C4GR and TJ9DKCF510I-C8GR cannot be used at t