the System z10 Enterprise Class is available in five hardware models: E12, E26, E40, E56, and E64. Each is of the machine type 2097. The Enterprise Class PU cores (four per chip) operate at speeds of 4.4 GHz. The processors are stored in one to four compartments referred to as "books". Each book comprises a multi-chip module (MCM) of processing units (PUs) and memory cards (including multi-level cache memory). The number of PUs in each book is based upon the model number: NOTES: A minimum of one CP, IFL, or ICF must ordered with every model. For each CP ordered, one zAAP and one zIIP may also be ordered. Optional SAPs are required only in some situations when using TPF/ESA or z/TPF. Memory figures refer to user-accessible memory. The z10 EC reserves 16GB for HSA (Hardware System Area). Sub-capacity (fractional) CP configurations are also available. Business Class Released on October 21, 2008, the z10 Business Class has only a single model: E10. Machine type is 2098. It has the same processor chip design and instruction set as the z10 EC but with higher manufacturing yields (3.5 GHz clock speed, one core per chip disabled) and lower cost processor packaging due to reduced cooling and reduced multi-chip shared cache needs. The z10 BC also introduced new, more efficient I/O packaging options. It is possible to configure a z10 BC without spare cores if desired, although such maximally configured z10s still fail gracefully in the unlikely event there's a core failure: the system will move any work from the failed core to surviving cores automatically, without operating system or software involvement, keeping all applications running, albeit at slightly reduced capacity if there are no spares remaining. The following configuration is available: NOTES: For each CP ordered, one zAAP and one zIIP may also be ordered. Memory figures refer to user-accessible memory. The z10 BC reserves 8GB for HSA (Hardware System Area). Sub-capacity (fractional) CP configurations are also available. Pricing While the baseline model of the z10 EC has a reported price starting at $1,000,000 for a new system, the z10 BC has a reported price starting "under $100,000". Actual prices depend on a number of factors including the configuration of the machine (amount of central memory, number of specialty engines, I/O options, etc.), maintenance contracts, government and educational discounts, and finance and leasing terms. IBM can also upgrade machines up to two