Editing IBM Blue Gene (section)

===Major features===
The Blue Gene/L supercomputer was unique in the following aspects:<ref>{{ cite journal |url=http://www.research.ibm.com/journal/rd49-23.html |journal=IBM Journal of Research and Development |title=Blue Gene |volume=49 |issue=2/3 |year=2005}}</ref>
* Trading the speed of processors for lower power consumption. Blue Gene/L used low frequency and low power embedded PowerPC cores with floating-point accelerators. While the performance of each chip was relatively low, the system could achieve better power efficiency for applications that could use large numbers of nodes.
* Dual processors per node with two working modes: co-processor mode where one processor handles computation and the other handles communication; and virtual-node mode, where both processors are available to run user code, but the processors share both the computation and the communication load.
* System-on-a-chip design. Components were embedded on a single chip for each node, with the exception of 512&nbsp;MB external DRAM.
* A large number of nodes (scalable in increments of 1024 up to at least 65,536).
* Three-dimensional [[torus interconnect]] with auxiliary networks for global communications (broadcast and reductions), I/O, and management.
* Lightweight OS per node for minimum system overhead (system noise).