get info on motherboard / PC specs without opening your case Linux only ..

Found this nifty command that saves me work with a screwdriver! Useful also when you are using a text only or headless Linux box.

    sudo dmidecode | less


e.g. of output
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Processor Information
    Socket Designation: Microprocessor
    Type: Central Processor
    Family: Pentium 4
    Manufacturer: Intel
    ID: 41 0F 00 00 FF FB EB BF
    Signature: Type 0, Family 15, Model 4, Stepping 1
    Flags:
        FPU (Floating-point unit on-chip)
        VME (Virtual mode extension)
        DE (Debugging extension)
        PSE (Page size extension)
        TSC (Time stamp counter)
        MSR (Model specific registers)
        PAE (Physical address extension)
        MCE (Machine check exception)
        CX8 (CMPXCHG8 instruction supported)
        APIC (On-chip APIC hardware supported)
        SEP (Fast system call)
        MTRR (Memory type range registers)
        PGE (Page global enable)
        MCA (Machine check architecture)
        CMOV (Conditional move instruction supported)
        PAT (Page attribute table)
        PSE-36 (36-bit page size extension)
        CLFSH (CLFLUSH instruction supported)
        DS (Debug store)
        ACPI (ACPI supported)
        MMX (MMX technology supported)
        FXSR (Fast floating-point save and restore)
        SSE (Streaming SIMD extensions)
        SSE2 (Streaming SIMD extensions 2)
        SS (Self-snoop)
        HTT (Hyper-threading technology)
        TM (Thermal monitor supported)
        PBE (Pending break enabled)
    Version: Not Specified
    Voltage: 1.7 V
    External Clock: 800 MHz
    Max Speed: 4000 MHz
    Current Speed: 3000 MHz
    Status: Populated, Enabled
    Upgrade: ZIF Socket
    L1 Cache Handle: 0x0700
    L2 Cache Handle: 0x0701
    L3 Cache Handle: Not Provided