I have a Asus U32U Rx012D. Here is the relevant specification :
Memory : DDR3 1333/1066 MHz SDRAM, 2 x SO-DIMM socket for expansion up
to 8 GB SDRAM *1
My processor is an E450 which means DDR3 1333 and 1066 support is present. The RAM chip in the laptop is the manufacturer installed chip.
However, when checking the RAM speeds, the speed that I am seeing is 667MHz.
asheesh@ashrj-U32U:~$ sudo lshw -C memory
*-memory
description: System Memory
physical id: 26
slot: System board or motherboard
size: 2GiB
capacity: 2GiB
*-bank:0
description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
product: HMT325S6CFR8C-H9
vendor: Hynix Semiconduc
physical id: 0
serial: 32C0EB88
slot: A1_DIMM0
size: 2GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:1
description: DIMM Synchronous [empty]
product: Array1_PartNumber1
vendor: A1_Manufacturer1
physical id: 1
serial: A1_SerNum1
slot: A1_DIMM1
Even the motherboard A50M doesnt support clock speeds below 800MHz.
Why this discrepancy in clock speeds?
Best Answer
everything is fine. DDR3 1333 = 666MHz. The manufactures double the Speed for marketing because DDR RAM can transfer data on both the rising and falling edges of the clock signal.