Nos a helyzet érdekes, mert mind az lshw mind a dmidecode látja mind a négy modult.
*-memory
description: System Memory
physical id: c
slot: System board or motherboard
size: 16GiB
*-bank:0
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: F3-12800CL9-4GBRL
vendor: Undefined
physical id: 0
serial: 00000000
slot: A1_DIMM0
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:1
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: F3-12800CL9-4GBRL
vendor: Undefined
physical id: 1
serial: 00000000
slot: A1_DIMM1
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:2
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: F3-12800CL9-4GBRL
vendor: Undefined
physical id: 2
serial: 00000000
slot: A1_DIMM2
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:3
description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: F3-12800CL9-4GBRL
vendor: Undefined
physical id: 3
serial: 00000000
slot: A1_DIMM3
size: 4GiB
width: 64 bits
clock: 1600MHz (0.6ns)
Ugyanakkor: grep MemTotal /proc/meminfo
MemTotal: 7897088 kB