Your system's maximum RAM speed is limited to 1800MHz.
Your system's maximum RAM speed is limited to 1800MHz.
I designed a fresh system, yet my RAM doesn’t reach 3600Mhz and the Ryzen 3900X struggles above 4Ghz under full demand. What options remain?
CPU-Z indicates your RAM speed as 1800 MHz for a 3600 MHz rated chip, which is accurate. It displays the actual clock frequency, not the advertised one. This value can be double what you expect. The performance depends on the workload you're applying. A 4 GHz frequency is still within normal ranges.
You're asking about the meaning behind those specifications. It refers to a standard where the effective speed is doubled, which is why it's called DDR (Double Data Rate). The 4GHz all-core configuration is typical for a stock 3900X model.
In short, 1800Mhz CPU-Z indicates 3600Mhz memory bandwidth. Each cycle handles two files, meaning the specs are based on 1800Mhz ticks per second, not 3600 transfers per second. Manufacturers simplify by showing 3600MT/s for marketing purposes. For clarity, a 3900X boost across all cores reaches around 4.1-4.2GHz, making 4GHz boost reasonable.
This program operates at 3600MHz and uses DDR memory. The term 'DDR' means Double Data Rate, which doubles the data transfer rate. It's typical for this setup, as the base speed is around 3.8GHz, giving a performance boost.
1800Mhz is the standard frequency reported in certain software. DDR means double data rate, where data moves during both the rising and falling edges of each clock cycle. This is why it's doubled (from 1800 to 3600) for stable performance at 4ghz on a 3900x chip. Your temperatures are likely between 70-85°C.
The price remains consistent at 1800. (ddr applies double rate)