Quote:
Originally Posted by lattimro
Hi Folks,
I will like to try upgrading my DDR3 and I was looking for info but I am confused with the following:
- Ubuntu 22.04.3 LTS, Linux 6.2.0-26-generic: memtest86 (or memtest86+) reports 1600 MHz and dmidecode reports Speed: 1333MT/s
- Windows10 and CPU-Z reports Speed: 1333MT/s
From Notebook Specification:
The issue that I am confused is that dmidecode, Windows10 and CPU-Z reports Speed: 1333 MT/s, MEMTEST86 and physical memory stick label shows 1600 MHz
AFAIK:
MHz measures RAM speed by how many times it can switch voltage per second, while MT/s measures RAM speed by how much data it can transfer per second.
1600MHz will actually mean 3200 MT/s (dmidecode reports of my DDR only 1333 MT/s) because the data rate is double the frequency or clock speed in DDR RAM.
Installed DDRL is a single-rank module 1Rx8 and PC3-12800S Low Voltage (1.35V). By far 1.35V should not be a concern as nowadays the sticks are dual-voltage (1.35/1.5V).
So the main question is why 1333 MT/s is reported?
I attached some info for your review. Thanks so much!
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Ok, why not check what the BIOS says? Or if you want to call it UEFI.
You should be able to enter the BIOS and choose at whatever speed you want to run the RAM at unless if you have some brand name laptop that doesn't offer much in terms of configuration.
A real techy BIOS will let you tune the voltage, tune each timing.
Have you checked the maker's website and downloaded their manual?
On my system, I go into the BIOS and push my DDR4 to 3200 MHz and reduce the timings a bit. If stable for a long time, I leave it.
The RAM will likely generate more heat, so I buy sticks with a heatsink.
I never increase the voltage.
