The cluster contains the following machines:

• 12 Intel Xeon E2670 machines with 16-cores and 128GB of RAM [ctcp-sgi]
• 16 AMD Opteron 6174 machines with 24-cores and 64GB of RAM [ctcp]
• 4 Intel Xeon X5550 machines with 8-cores and 48GB of RAM [ctcp-blade]
• 2 Intel Xeon X5660 machines with 12-cores and 48GB of RAM [ctcp-blade]
• The remaining systems are Intel Xeon X5355 machines with 8-cores and 16GB of RAM [bestgrid]

The AMD Opteron based machines offer higher theoretical peak floating point performance and memory bandwidth. However, the Intel Xeon machines have faster individual cores. Therefore, if your job only uses a small number of cores it will probably finish more quickly when run on the Intel Xeon machines.