Apenas metade da RAM é vista

Eu tenho dois cartões de memória RAM cruciais que coloco em dois slots que supostamente funcionam em canal duplo. O BIOS vê os dois, mas no total está mostrando apenas a metade:

CPU-Z mostra 8 GB de RAM, mas apenas o Windows 10 4. Se eu colocar os sticks no modo de canal único (slots A1 / A2, por exemplo), todos os 8 GB serão reconhecidos pelo Windows.

Isso é uma falha na placa principal e nada pode ser feito?

Alterar a frequência não ajuda. Como colocar as varas em outros slots: insira a descrição da imagem aqui

Aqui está parte do relatório CPU-Z:

Chipset
-------------------------------------------------------------------------

Northbridge         AMD K15 IMC rev. 00
Southbridge         AMD A88X FCH rev. 2.6
Graphic Interface       PCI-Express
PCI-E Link Width        x0
PCI-E Max Link Width        x0
Memory Type         DDR3
Memory Size         8 GBytes
Channels            Single
Memory Frequency        666.5 MHz (3:20)
CAS# latency (CL)       9.0
RAS# to CAS# delay (tRCD)   9
RAS# Precharge (tRP)        9
Cycle Time (tRAS)       24
Bank Cycle Time (tRC)       29
Uncore Frequency        1799.6 MHz


Memory SPD
-------------------------------------------------------------------------

DIMM #              1
    SMBus address       0x50
    Memory type     DDR3
    Module format       UDIMM
    Manufacturer (ID)   Crucial Technology (7F7F7F7F7F9B0000000000)
    Size            4096 MBytes
    Max bandwidth       PC3-10700H (667 MHz)
    Part number     BLT4G3D1869DT1TX0.
    Serial number       A4133449
    Number of banks     8
    Nominal Voltage     1.50 Volts
    EPP         no
    XMP         yes
    XMP revision        1.3
    AMP         no
JEDEC timings table     CL-tRCD-tRP-tRAS-tRC @ frequency
    JEDEC #1        6.0-6-6-16-22 @ 444 MHz
    JEDEC #2        8.0-8-8-22-30 @ 592 MHz
    JEDEC #3        9.0-9-9-24-33 @ 666 MHz
XMP profile         XMP-1866
    Specification       PC3-14900
    Voltage level       1.500 Volts
    Min Cycle time      1.071 ns (933 MHz)
    Max CL          9.0
    Min tRP         9.43 ns
    Min tRCD        9.43 ns
    Min tWR         15.00 ns
    Min tRAS        28.14 ns
    Min tRC         49.50 ns
    Min tRFC        160.00 ns
    Min tRTP        7.50 ns
    Min tRRD        6.00 ns
    Command Rate        2T
XMP timings table       CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
    XMP #1          6.0-6-6-18-32-2T @ 636 MHz (1.500 Volts)
    XMP #2          7.0-7-7-21-37-2T @ 742 MHz (1.500 Volts)
    XMP #3          8.0-8-8-24-42-2T @ 848 MHz (1.500 Volts)
    XMP #4          9.0-9-9-27-47-2T @ 933 MHz (1.500 Volts)
    XMP #5          10.0-9-9-27-47-2T @ 933 MHz (1.500 Volts)

DIMM #              2
    SMBus address       0x51
    Memory type     DDR3
    Module format       UDIMM
    Manufacturer (ID)   Crucial Technology (7F7F7F7F7F9B0000000000)
    Size            4096 MBytes
    Max bandwidth       PC3-10700H (667 MHz)
    Part number     BLT4G3D1869DT1TX0.
    Serial number       A019CA21
    Number of banks     8
    Nominal Voltage     1.50 Volts
    EPP         no
    XMP         yes
    XMP revision        1.3
    AMP         no
JEDEC timings table     CL-tRCD-tRP-tRAS-tRC @ frequency
    JEDEC #1        6.0-6-6-16-22 @ 444 MHz
    JEDEC #2        8.0-8-8-22-30 @ 592 MHz
    JEDEC #3        9.0-9-9-24-33 @ 666 MHz
XMP profile         XMP-1866
    Specification       PC3-14900
    Voltage level       1.500 Volts
    Min Cycle time      1.071 ns (933 MHz)
    Max CL          9.0
    Min tRP         9.43 ns
    Min tRCD        9.43 ns
    Min tWR         15.00 ns
    Min tRAS        28.14 ns
    Min tRC         49.50 ns
    Min tRFC        160.00 ns
    Min tRTP        7.50 ns
    Min tRRD        6.00 ns
    Command Rate        2T
XMP timings table       CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
    XMP #1          6.0-6-6-18-32-2T @ 636 MHz (1.500 Volts)
    XMP #2          7.0-7-7-21-37-2T @ 742 MHz (1.500 Volts)
    XMP #3          8.0-8-8-24-42-2T @ 848 MHz (1.500 Volts)
    XMP #4          9.0-9-9-27-47-2T @ 933 MHz (1.500 Volts)
    XMP #5          10.0-9-9-27-47-2T @ 933 MHz (1.500 Volts)

DIMM #              1
SPD registers   
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    00  93 13 0B 02 03 19 00 09 03 52 01 08 0C 00 34 00 
    10  6C 78 6C 30 6C 11 20 8C 00 05 3C 3C 00 F0 82 05 
    20  00 00 00 00 00 00 00 00 00 08 00 00 00 00 00 00 
    30  00 00 00 00 00 00 00 00 00 00 00 00 0F 11 01 01 
    40  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    50  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    60  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    70  00 00 00 00 00 85 9B 00 00 00 A4 13 34 49 B8 8F 
    80  42 4C 54 34 47 33 44 31 38 36 39 44 54 31 54 58 
    90  30 2E 01 00 80 2C 42 5A 41 48 39 57 4D 30 30 31 
    A0  FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    B0  0C 4A 01 13 01 0E 00 00 11 2A 0F 84 7C 00 84 84 
    C0  84 D2 21 8A B5 6D 00 C0 08 69 54 01 A4 69 00 00 
    D0  1C 00 26 00 00 00 00 00 00 00 00 00 00 00 00 00 
    E0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 

DIMM #              2
SPD registers   
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    00  93 13 0B 02 03 19 00 09 03 52 01 08 0C 00 34 00 
    10  6C 78 6C 30 6C 11 20 8C 00 05 3C 3C 00 F0 82 05 
    20  00 00 00 00 00 00 00 00 00 08 00 00 00 00 00 00 
    30  00 00 00 00 00 00 00 00 00 00 00 00 0F 11 01 01 
    40  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    50  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    60  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    70  00 00 00 00 00 85 9B 00 00 00 A0 19 CA 21 B8 8F 
    80  42 4C 54 34 47 33 44 31 38 36 39 44 54 31 54 58 
    90  30 2E 01 00 80 2C 42 5A 41 48 39 57 4D 30 30 31 
    A0  FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    B0  0C 4A 01 13 01 0E 00 00 11 2A 0F 84 7C 00 84 84 
    C0  84 D2 21 8A B5 6D 00 C0 08 69 54 01 A4 69 00 00 
    D0  1C 00 26 00 00 00 00 00 00 00 00 00 00 00 00 00 
    E0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 


Monitoring
-------------------------------------------------------------------------

Mainboard Model     A88X-PRO (0x00000227 - 0x00A0C942)



DMI
-------------------------------------------------------------------------

DMI BIOS        
    vendor          American Megatrends Inc.
    version         2603
    date            03/10/2016
    ROM size        8192 KB

DMI System Information      
    manufacturer        System manufacturer
    product         System Product Name
    version         System Version
    serial          System Serial Number
    UUID            {6B64AB80-15C6-11E0-A92A-40167EAD028F}
    SKU         SKU
    family          To be filled by O.E.M.

DMI Baseboard       
    vendor          ASUSTeK COMPUTER INC.
    model           A88X-PRO
    revision        Rev X.0x
    serial          140525890700221

DMI System Enclosure        
    manufacturer        Chassis Manufacture
    chassis type        Desktop
    chassis serial      Chassis Serial Number

— warvariuc
fonte

Você já os experimentou nos slots A1 / B1 em vez de A2 / B2?

— Mokubai

Observe também que o BIOS está relatando um total de 4 GB na parte superior.

— Andrew Domaszek 02/02

Observe que a memória total indica 1866MHz, mas os DIMMs instalados parecem partes de 1333MHz. Altere a configuração necessária para que ele opere a RAM em 1333 MHz.

— Andrew Morton

Eu atualizei a pergunta. Funcionou originalmente quando comprei o computador. Então parou, não me lembro de nenhum incidente. E a RAM suporta 1833 MHz.

— warvariuc

Aqui é um segmento muito semelhante: tomshardware.co.uk/answers/id-1852181/...

— warvariuc

Acontece que os slots B1 / B2 não estão funcionando corretamente. Se eu colocar os dois palitos neles, o comp não inicia. Portanto, é um defeito mobo ou cpu. Vou olhar para os pinos da CPU quando tiver tempo, talvez eles estejam danificados.

— warvariuc
fonte