Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Recently I noticed lshw tells me a strange thing. Here is the first part of my lshw output:

bpetit-1025c
description: Notebook
product: 1025C (1025C)
vendor: ASUSTeK COMPUTER INC.
version: x.x
serial: C3OAAS000774
width: 32 bits
capabilities: smbios-2.7 dmi-2.7 smp-1.4 smp
configuration: boot=normal chassis=notebook cpus=2 family=Eee PC...


 *-core
       description: Motherboard
       product: 1025C
       vendor: ASUSTeK COMPUTER INC.
       physical id: 0
       version: x.xx
       serial: EeePC-0123456789
       slot: To be filled by O.E.M.
     *-firmware
          description: BIOS
          vendor: American Megatrends Inc.
          physical id: 0
          version: 1025C.0701
          date: 01/06/2012
          size: 64KiB
          capacity: 1984KiB
          capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd...
     *-cpu:0
          description: CPU
          product: Intel(R) Atom(TM) CPU N2800   @ 1.86GHz
          vendor: Intel Corp.
          physical id: 4
          bus info: cpu@0
          version: 6.6.1
          serial: 0003-0661-0000-0000-0000-0000
          slot: CPU 1
          size: 798MHz
          capacity: 1865MHz
          width: 64 bits
          clock: 533MHz
          capabilities: x86-64 boot fpu fpu_exception wp vme de pse tsc ...
          configuration: cores=2 enabledcores=1 id=2 threads=2
        *-cache:0
             description: L1 cache
             physical id: 5
             slot: L1-Cache
             size: 24KiB
             capacity: 24KiB
             capabilities: internal write-back unified
        *-cache:1
             description: L2 cache
             physical id: 6
             slot: L2-Cache
             size: 512KiB
             capacity: 512KiB
             capabilities: internal varies unified
        *-logicalcpu:0
             description: Logical CPU
             physical id: 2.1
             width: 64 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 2.2
             width: 64 bits
             capabilities: logical
        *-logicalcpu:2
             description: Logical CPU
             physical id: 2.3
             width: 64 bits
             capabilities: logical
        *-logicalcpu:3
             description: Logical CPU
             physical id: 2.4
             width: 64 bits
             capabilities: logical
     *-memory
          description: System Memory
          physical id: 13
          slot: System board or motherboard
          size: 2GiB
        *-bank:0
             description: SODIMM [empty]
             product: [Empty]
             vendor: [Empty]
             physical id: 0
             serial: [Empty]
             slot: DIMM0
        *-bank:1
             description: SODIMM DDR3 Synchronous 1066 MHz (0.9 ns)
             product: SSZ3128M8-EAEEF
             vendor: Xicor
             physical id: 1
             serial: 00000004
             slot: DIMM1
             size: 2GiB
             width: 64 bits
             clock: 1066MHz (0.9ns)
     *-cpu:1
          physical id: 1
          bus info: cpu@1
          version: 6.6.1
          serial: 0003-0661-0000-0000-0000-0000
          size: 798MHz
          capacity: 798MHz
          capabilities: ht cpufreq
          configuration: id=2
        *-logicalcpu:0
             description: Logical CPU
             physical id: 2.1
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 2.2
             capabilities: logical
        *-logicalcpu:2
             description: Logical CPU
             physical id: 2.3
             capabilities: logical
        *-logicalcpu:3
             description: Logical CPU
             physical id: 2.4
             capabilities: logical

So here I see my processor is effectively a 64 bits one. However, I'm wondering how my motherboard can have a "32 bits width". I've browsed the web to find an answer, without success. I imagine it's just a technical fact that I don't know about.

Thanks.

share|improve this question
add comment

1 Answer

up vote 0 down vote accepted

I know there haven't really been 32/64 bit motherboards in years, but perhaps that is not true in notebooks. It would somewhat make sense since Atoms were 32-bit only for a long time, and computers with atom processors are rarely sold with more than 2 gb of ram, or even upgradeable to more than 4. Perhaps they were skimping on cost by only having 32-bit support.

For what it's worth, my desktop motherboard reports 64-bit width with a 64-bit processor and 64-bit OS.

share|improve this answer
    
Thanks for your answer. It seems my 32 bits motherboard is really restrictive: I tried to install xubuntu 12.10 64 bits and the installer tells me this: "This kernel requires an x86-64 CPU, but only detected an i686 CPU. [...]". I don't understand why the constructor has put a 64 bits cpu with a 32 bits motherboard... –  bpetit Oct 25 '12 at 18:45
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.