IBM's mainframe has supported Linux for five years, and Big Blue is increasing its push on this front because Linux because is becoming a more sophisticated enterprise-class operating system, Freund says. The mainframe doesn't have a way to run workloads but "It's something we're certainly interested in exploring," he adds.

The z10 BC is nearly 40% faster and has nearly four times the maximum memory of its predecessor, IBM says. The new business-class mainframe delivers capacity equal to 232 x86 servers, while the high-end mainframe is equal to nearly 1,500 x86 servers, IBM says.

With the exception of IBM, the mainframe market is pretty much dead, Day says. Customers that have never owned a mainframe are often wary of buying one, but IBM has tried to reinvent the system to operate new workloads, such as ones more commonly run on RISC and Itanium processors. Day says the effort has been successful, as much of IBM's mainframe growth over the last two years can be attributed to new workloads rather than upgrades to pre-existing machines.

The mainframe has always run data-intensive transaction processing applications such as those used in the financial and utility industries, Day notes. Now it's getting better at running compute-intensive workloads that demand high amounts of CPU and memory, he says.

The basic pricing of z10 BC starts at under $100,000, about the same as the previous business class mainframe. Typical deals will range from $250,000 to $500,000 Freund says. The top-of-the-line z10 mainframe announced in February starts at $1 million and the price increases dramatically depending on the configuration.