How to check memory model in Centos?

[root@lch1 ~]# yum install lshw
Loaded plugins: fastestmirror, priorities, refresh-packagekit
Loading mirror speeds from cached hostfile
* base: ftp.fi.muni.cz
* extras: ftp.fi.muni.cz
* rpmforge-extras: be.mirror.eurid.eu
* updates: ftp.hosteurope.de
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package lshw.x86_64 0:B.02.15-3.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
lshw x86_64 B.02.15-3.el6 linuxtech 247 k

Transaction Summary
================================================================================
Install 1 Package(s)

Total download size: 247 k
Installed size: 654 k
Is this ok [y/N]: y
Downloading Packages:
lshw-B.02.15-3.el6.x86_64.rpm | 247 kB 00:03
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : lshw-B.02.15-3.el6.x86_64 1/1
Verifying : lshw-B.02.15-3.el6.x86_64 1/1

Installed:
lshw.x86_64 0:B.02.15-3.el6

Complete!
[root@lch1 ~]# lshw -class memory
*-cache:0
description: L1 cache
physical id: 5
slot: L1-Cache
size: 128KiB
capacity: 128KiB
capabilities: internal write-through unified
*-cache:1
description: L2 cache
physical id: 6
slot: L2-Cache
size: 1MiB
capacity: 1MiB
capabilities: internal write-through unified
*-cache:2 DISABLED
description: L3 cache
physical id: 7
slot: L3-Cache
size: 6MiB
capacity: 6MiB
capabilities: internal write-back unified
*-memory
description: System Memory
physical id: d
slot: System board or motherboard
size: 8GiB
*-bank:0
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: CML8GX3M2A1600C9
vendor: Corsair
physical id: 0
serial: 00000000
slot: A1_DIMM0
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:1
description: DIMM Synchronous [empty]
product: Array1_PartNumber1
vendor: A1_Manufacturer1
physical id: 1
serial: A1_SerNum1
slot: A1_DIMM1
width: 64 bits
*-bank:2
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: CML8GX3M2A1600C9
vendor: Corsair
physical id: 2
serial: 00000000
slot: A1_DIMM2
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:3
description: DIMM Synchronous [empty]
product: Array1_PartNumber3
vendor: A1_Manufacturer3
physical id: 3
serial: A1_SerNum3
slot: A1_DIMM3
width: 64 bits
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: P1.40
date: 07/08/2011
size: 64KiB
capacity: 8128KiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification