. Author manuscript; available in PMC: 2011 Jun 1.

Published in final edited form as: J Struct Biol. 2010 Jun 15;172(3):407–412. doi: 10.1016/j.jsb.2010.06.010

Table 2.

Configurations of the computer systems used for the test

System	I	II
Operating system	Fedora 11	Centos 5
Motherboard	Asus P6TD Deluxe	SuperServer 7046GT-TRF
CPU	1 × Intel i7 920 quad core, 2.66 GHz	2 × Intel Xeon X5550 quad core, 2.66 GHz
RAM	12GB DDR3-1333	24GB DDR3-1333
Graphic Card	2 × NVIDIA GeForce GTX 295	4 × NVIDIA GeForce GTX 295
Total number of GPUs¹	4	8

Each GTX 295 graphic card was connected through a PCI-E 2.0 16X expansion slot. In both systems, all GPUs were used for computation only (no display). In System I, a third NVIDIA graphic card, GeForce 8400 GS was used to drive a display. In System II, an onboard VGA controller is used for the display.