Solved RAM Speed

My system shows the installed memory speed as 4800 MT/s. please confirm what this speed corresponds to in MHz?

this may explain better

Frequency (MHz) and data rate (MT/s) are therefore both good parameters for measuring RAM speed. MHz measures RAM speed in terms of the number of times it can change voltage per second, while MT/s measures RAM speed in terms of the amount of data it can transfer per second.
Although RAM speed is still usually quoted in MHz, the numbers are actually MT/s, so this shouldn't be a problem when comparing modules.

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best of luck Steve ..

asadermo said:

My system shows the installed memory speed as 4800 MT/s. please confirm what this speed corresponds to in MHz?

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2400 Mhz.

2400 MHz is is the clock speed and since two memory transfers occur in a clock cycle, the memory transfer speed in MegaTransfers/sec is twice the memory clock speed. That is why it is called DDR (Double Data Rate).

asadermo said:

My system shows the installed memory speed as 4800 MT/s. please confirm what this speed corresponds to in MHz?

Click to expand...

MT/s is the same as Mhz, for all intents and purposes.
DDR means Double Data Rate, which is why CPU-Z will show 1600Mhz when the RAM is 3200Mhz.





It's all just idiotic terminology.

They are the same with SDR memory, but not with DDR memory(double data rate).
One is the clock frequency (MHz), the other is data rate(MT/s).

Unfortunately the App writers cause confusion by using some additional terms that most people do not know about. Even the likes of CPU-Z.

The data rate sometime back used to be shown as MHz but that changed to MT/s to avoid confusion but that still remains...

The speed you see in device manager is the actual speed of the RAM
.

CPUZ screenshot:

This Task Manager (Windows 10) shows 800 MHz, not MT/s. I have DDR3 at "1600 MHz" in this computer (the RAM itself can do 1866 w/ XMP but the mobo cannot w/ 4x8 GB modules, pre-Ryzen AMDs are poor in memory bandwidth anyway -14 GB/s I've heard for the FX8350, Intel was superior in this age specially in memory bandwidth, bear in mind double channel-). It follows the same rule as CPU-Z, that I consider "half the speed". 800 MHz is the RAM timers frecuency ("CL9" means 9 cycles of a 800 MHz clock), 1600 MHz is the data frequency. To get the PC3-12800 (or PC3-14933/14900 if @1866) you multiply the timers frequency times 16 or the data frequency times 8 (the data bus has 64 bits = 8 bytes), and you get MB/s (and per channel).

My first DDR RAM had 100 and 133 MHz. The 100 MHz modules for a 500 MHz Katmai (first Pentium 3) were weak and I upgraded them to 133. Before or after I upgraded the Katmai to a 650 MHz Coppermine (evolved Pentium 3) that could do 866 as if it were an 866 MHz part, with "133 MHz RAM" of course. I'm sure it was so in the commerce and in the users minds. Maybe DDR 200/400 started with the shift to name the data frequency.

I still have a DDR2 system, all my DDR2 RAM is/has been "800 MHz". The same for DDR3 (1333, 1600 or 1866 here) and DDR4 (I believe my miniPC uses 2133 MHz, soldered anyway).