可能的重复：
在 64 位系统上仅使用 3.2 Gb 内存
我一直在运行 11.10 的 64 位版本，它是从 11.04 升级的，不是全新安装的。我之前有 2GB 的内存，就在今天，我又增加了 4GB 的内存，总共有 6GB，但只有 3.2GB 可用。
BIOS 检测到它正常并显示 6GB。即使 lshw 显示 6GB 内存，但不知何故只有 3.2GB 可用。
输出 uname -a
ashfame@ashfame-desktop:~$ uname -a
Linux ashfame-desktop 3.0.0-13-generic #22-Ubuntu SMP Wed Nov 2 13:27:26 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
输出 free -m
ashfame@ashfame-desktop:~$ free -m
total used free shared buffers cached
Mem: 3268 2304 963 0 134 969
-/+ buffers/cache: 1201 2066
Swap: 2027 0 2027
输出 lshw
ashfame-desktop
description: Desktop Computer
product: ()
width: 64 bits
capabilities: smbios-2.4 dmi-2.4 vsyscall64 vsyscall32
configuration: boot=normal chassis=desktop uuid=95649FA0-34EF-11DC-B2FF-000EA6292A3D
*-core
description: Motherboard
product: DG965RY
vendor: Intel Corporation
physical id: 0
version: AAD41691-301
serial: BTRY728008RN
slot: Base Board Chassis Location
*-cpu
description: CPU
product: Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz
vendor: Intel Corp.
physical id: 0
bus info: cpu@0
version: Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz
slot: LGA 775
size: 2GHz
capacity: 4GHz
width: 64 bits
clock: 200MHz
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm cpufreq
*-cache:0
description: L2 cache
physical id: 1
slot: Unknown
size: 2MiB
capacity: 2MiB
capabilities: asynchronous internal write-back unified
*-cache:1
description: L1 cache
physical id: 3
slot: Unknown
size: 32KiB
capacity: 32KiB
capabilities: asynchronous internal write-back data
*-cache
description: L1 cache
physical id: 2
slot: Unknown
size: 32KiB
capacity: 32KiB
capabilities: asynchronous internal write-back instruction
*-firmware
description: BIOS
vendor: Intel Corp.
physical id: 4
version: MQ96510J.86A.1687.2007.0510.0258
date: 05/10/2007
size: 64KiB
capacity: 960KiB
capabilities: pci upgrade shadowing cdboot bootselect edd int9keyboard int14serial int17printer int10video acpi usb zipboot biosbootspecification netboot
*-memory
description: System Memory
physical id: 17
slot: System board or motherboard
size: 6GiB
*-bank:0
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: OCZ2N800SR1G
vendor: 0x7F7F7F7FB0000000
physical id: 0
serial: 0xFFFFFFFF
slot: J6H1
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:1
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: NT2GT64U8HD0BY-AD
vendor: Nanya Technology
physical id: 1
serial: 0xCB901004
slot: J6H2
size: 2GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:2
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: OCZ2N800SR1G
vendor: 0x7F7F7F7FB0000000
physical id: 2
serial: 0xFFFFFFFF
slot: J6J1
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:3
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: NT2GT64U8HD0BY-AD
vendor: Nanya Technology
physical id: 3
serial: 0x1B911003
slot: J6J2
size: 2GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-pci
description: Host bridge
product: 82P965/G965 Memory Controller Hub
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 02
width: 32 bits
clock: 33MHz
*-pci:0
description: PCI bridge
product: 82P965/G965 PCI Express Root Port
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pm msi pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:40 ioport:2000(size=4096) memory:e0200000-e02fffff ioport:d0000000(size=268435456)
*-display
description: VGA compatible controller
product: RV770 [Radeon HD 4850]
vendor: ATI Technologies Inc
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=fglrx_pci latency=0
resources: irq:50 memory:d0000000-dfffffff memory:e0200000-e020ffff ioport:2000(size=256) memory:e0220000-e023ffff
*-multimedia
description: Audio device
product: HD48x0 audio
vendor: ATI Technologies Inc
physical id: 0.1
bus info: pci@0000:01:00.1
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi bus_master cap_list
configuration: driver=HDA Intel latency=0
resources: irq:49 memory:e0210000-e0213fff
*-communication
description: Communication controller
product: 82P965/G965 HECI Controller
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei latency=0
resources: irq:16 memory:e0326100-e032610f
*-network
description: Ethernet interface
product: 82566DC Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth1
version: 02
serial: 00:19:d1:93:ad:2f
size: 100Mbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.3.10-k2 duplex=full firmware=1.1-0 ip=192.168.1.2 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:47 memory:e0300000-e031ffff memory:e0324000-e0324fff ioport:30e0(size=32)
*-usb:0
description: USB Controller
product: 82801H (ICH8 Family) USB UHCI Controller #4
vendor: Intel Corporation
physical id: 1a
bus info: pci@0000:00:1a.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: uhci bus_master
configuration: driver=uhci_hcd latency=0
resources: irq:16 ioport:30c0(size=32)
*-usb:1
description: USB Controller
product: 82801H (ICH8 Family) USB UHCI Controller #5
vendor: Intel Corporation
physical id: 1a.1
bus info: pci@0000:00:1a.1
version: 02
width: 32 bits
clock: 33MHz
capabilities: uhci bus_master
configuration: driver=uhci_hcd latency=0
resources: irq:21 ioport:30a0(size=32)
*-usb:2
description: USB Controller
product: 82801H (ICH8 Family) USB2 EHCI Controller #2
vendor: Intel Corporation
physical id: 1a.7
bus info: pci@0000:00:1a.7
version: 02
width: 32 bits
clock: 33MHz
capabilities: pm debug ehci bus_master cap_list
configuration: driver=ehci_hcd latency=0
resources: irq:18 memory:e0325c00-e0325fff
*-multimedia
description: Audio device
product: 82801H (ICH8 Family) HD Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=HDA Intel latency=0
resources: irq:48 memory:e0320000-e0323fff
*-pci:1
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 1
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:41 ioport:7000(size=4096) memory:e1200000-e13fffff ioport:e1400000(size=2097152)
*-pci:2
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 2
vendor: Intel Corporation
physical id: 1c.1
bus info: pci@0000:00:1c.1
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 ioport:1000(size=4096) memory:e0100000-e01fffff ioport:e1000000(size=2097152)
*-ide
description: IDE interface
product: 88SE6101/6102 single-port PATA133 interface
vendor: Marvell Technology Group Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: scsi0
version: b1
width: 32 bits
clock: 33MHz
capabilities: ide pm msi pciexpress bus_master cap_list emulated
configuration: driver=pata_marvell latency=0
resources: irq:17 ioport:1018(size=8) ioport:1024(size=4) ioport:1010(size=8) ioport:1020(size=4) ioport:1000(size=16) memory:e0100000-e01001ff
*-cdrom
description: DVD-RAM writer
product: DVD RW AW-G170A
vendor: SONY
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/scd0
logical name: /dev/sr0
version: 1.62
serial: [
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
*-pci:3
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 3
vendor: Intel Corporation
physical id: 1c.2
bus info: pci@0000:00:1c.2
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:43 ioport:6000(size=4096) memory:e0c00000-e0dfffff ioport:e0e00000(size=2097152)
*-pci:4
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 4
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:44 ioport:5000(size=4096) memory:e0800000-e09fffff ioport:e0a00000(size=2097152)
*-pci:5
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 5
vendor: Intel Corporation
physical id: 1c.4
bus info: pci@0000:00:1c.4
version: 02
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:45 ioport:4000(size=4096) memory:e0400000-e05fffff ioport:e0600000(size=2097152)
*-usb:3
description: USB Controller
product: 82801H (ICH8 Family) USB UHCI Controller #1
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: uhci bus_master
configuration: driver=uhci_hcd latency=0
resources: irq:23 ioport:3080(size=32)
*-usb:4
description: USB Controller
product: 82801H (ICH8 Family) USB UHCI Controller #2
vendor: Intel Corporation
physical id: 1d.1
bus info: pci@0000:00:1d.1
version: 02
width: 32 bits
clock: 33MHz
capabilities: uhci bus_master
configuration: driver=uhci_hcd latency=0
resources: irq:19 ioport:3060(size=32)
*-usb:5
description: USB Controller
product: 82801H (ICH8 Family) USB UHCI Controller #3
vendor: Intel Corporation
physical id: 1d.2
bus info: pci@0000:00:1d.2
version: 02
width: 32 bits
clock: 33MHz
capabilities: uhci bus_master
configuration: driver=uhci_hcd latency=0
resources: irq:18 ioport:3040(size=32)
*-usb:6
description: USB Controller
product: 82801H (ICH8 Family) USB2 EHCI Controller #1
vendor: Intel Corporation
physical id: 1d.7
bus info: pci@0000:00:1d.7
version: 02
width: 32 bits
clock: 33MHz
capabilities: pm debug ehci bus_master cap_list
configuration: driver=ehci_hcd latency=0
resources: irq:23 memory:e0325800-e0325bff
*-pci:6
description: PCI bridge
product: 82801 PCI Bridge
vendor: Intel Corporation
physical id: 1e
bus info: pci@0000:00:1e.0
version: f2
width: 32 bits
clock: 33MHz
capabilities: pci subtractive_decode bus_master cap_list
resources: memory:e0000000-e00fffff
*-firewire
description: FireWire (IEEE 1394)
product: TSB43AB22A IEEE-1394a-2000 Controller (PHY/Link) [iOHCI-Lynx]
vendor: Texas Instruments
physical id: 3
bus info: pci@0000:07:03.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm ohci bus_master cap_list
configuration: driver=firewire_ohci latency=32 maxlatency=4 mingnt=2
resources: irq:19 memory:e0004000-e00047ff memory:e0000000-e0003fff
*-isa
description: ISA bridge
product: 82801HB/HR (ICH8/R) LPC Interface Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: isa bus_master cap_list
configuration: latency=0
*-storage
description: SATA controller
product: 82801HB (ICH8) 4 port SATA AHCI Controller
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
logical name: scsi1
version: 02
width: 32 bits
clock: 66MHz
capabilities: storage msi pm ahci_1.0 bus_master cap_list emulated
configuration: driver=ahci latency=0
resources: irq:46 ioport:3408(size=8) ioport:3414(size=4) ioport:3400(size=8) ioport:3410(size=4) ioport:3020(size=32) memory:e0325000-e03257ff
*-disk
description: ATA Disk
product: ST3160215AS
vendor: Seagate
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/sda
version: 3.AA
serial: 5RX16VWR
size: 149GiB (160GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 signature=00090294
*-volume:0
description: EXT4 volume
vendor: Linux
physical id: 1
bus info: scsi@1:0.0.0,1
logical name: /dev/sda1
logical name: /
version: 1.0
serial: 6c158778-6562-40f5-9f4f-1d49d9d68b13
size: 147GiB
capacity: 147GiB
capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized
configuration: created=2011-05-01 10:12:11 filesystem=ext4 lastmountpoint=/ modified=2011-11-26 20:37:01 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered mounted=2011-11-26 20:37:47 state=mounted
*-volume:1
description: Extended partition
physical id: 2
bus info: scsi@1:0.0.0,2
logical name: /dev/sda2
size: 2028MiB
capacity: 2028MiB
capabilities: primary extended partitioned partitioned:extended
*-logicalvolume
description: Linux swap / Solaris partition
physical id: 5
logical name: /dev/sda5
capacity: 2028MiB
capabilities: nofs
*-serial UNCLAIMED
description: SMBus
product: 82801H (ICH8 Family) SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 02
width: 32 bits
clock: 33MHz
configuration: latency=0
resources: memory:e0326000-e03260ff io
您的 RAM 模块与主板兼容，但内存频率是限制因素 - 这就是为什么您只有 3.2GB 可用于操作系统，800MB 保留给主板系统显卡。
根据英特尔的产品规格页，您的英特尔主板仅支持使用 DDR2 800 DIMM 的最大总系统内存 4 GB
输出中列出的两个品牌 RAM 模块NT2GT64U8HD0BY-AD和OCZ2N800SR1G的产品编号lshw表明它们是 800MHz 的 PC2-6400 模块。
从您的屏幕截图中可以看出，您的 BIOS 将内存频率限制为 667MHZ，并且确实显示它们是 800MHz 模块。
您可以看到安装的 6GB RAM 的原因lshw是 Ubuntu 列出了系统上安装的所有硬件- 而不是正在使用的硬件。
为了让您的主板使用更多 RAM，您需要购买额定频率为 533 或 667MHZ 的模块 - 那么您最多可以使用 8GB。
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