Low Profile

11.6" x 11.3" x 2.7"

compact

8.22" x 2.87" x 9.8" w x h x d

Standard

8" W x 4" H x 8" D

The case you choose will control the number of ports available.

The Low profile case can handle up to 6 COM ports and 8 USB ports while the compact case can handle 1-2 COM ports depending on the motherboard and 6 USB ports.

FEATURE/MODEL All systems priced with  500Gb HD, DVD Burner, low profile case & wide input power supply	Intel Atom N550 Dual Core 1.5 Ghz with Fanless Motherboard	Core 2 Duo Max	Core i3 i3-2100T 2.5Ghz Maximum computing & Graphics power with low power  consumption
CPU	Intel Atom N550 dual core 1.5Ghz. 2nd generation Atom	P7550 25 watt Core2 Duo 2.26Ghz. other CPU's available	Core i3-2100T 2.5 Ghz 2 core, 4 thread
MEMORY	2 Gb	4 Gb	4 Gb up to 8 Gb with 64 bit OS
COM PORTS	2 RS232 COM ports  can support  up to six	Up to 4 RS232 depending on Case	5
USB 2.0 PORTS	7	Up to 10 depending on case	10
LAN (RJ45)	2	2	1 Gigabit
PARALELL PORT	0	0	0
EXPANSION PORTS	1 PCI	1 PCI, 1 mini-PCIexpress,	Used by Serial adapter card
VIDEO	VGA	VGA & DVI-D  dual monitor support	VGA, DVI-D & HDMI Dual Monitor  support
PS2 Keyboard & Mouse	1 PS2 supporting a keyboard & mouse with splitter	0	Keyboard
Power Consumption @ Idle	18 watts	22 watts	18-20 watts
Recent System Cost 01/01/11	$819 in Low Profile Case	$989 In Low Profile Case	$920 $1059 with W7 Pro installed