Changing RAM speeds requires some guidance... would you be willing to help?
Changing RAM speeds requires some guidance... would you be willing to help?
Hello, your RAM speed has been upgraded from 2133 to 2666. The CPU-Z reports a base frequency of 4311.6 and DRAM frequency at 1337. With your i9-9900K CPU, the specs indicate it supports RAM speeds up to 2666, so you're within safe limits. You're using Corsair Vengeance PRO modules and have four sticks installed. Be mindful of stability, ensure all modules are compatible, and verify that your system settings match the new RAM speed for optimal performance.
the key to understand is that CPU-Z displays D-RAM frequency, not DDR4 speed, which is typically double the cycle count. This means your RAM appears at 2674, which might seem odd but fits real-world examples—like if your DDR4 is at 2133, it shows 1066, yet the command rate is 2T, so 2×1066 equals 2132.
Be mindful of potential stability issues and overheating risks when increasing RAM speed.
If it wasn’t the 2666, I wouldn’t recommend a nightly memtest unless you’re certain. A minor adjustment of 0.05 or 0.1 V might stabilize it, but if MemTest detects issues, a slight bump could help. Otherwise, you’d just get a faster PC with no other problems.
The RAM operates at the intended speed. Effective memory speed is DDR4-2666 at 2666 MHz, but the real frequency is around 1333.333 MHz. This happens because RAM uses Double Data Rate (DDR) and reads/writes on both rising and falling edges of each cycle. Command rate refers to the time between selecting the RAM and sending commands, measured in clock cycles. It’s unrelated to the RAM’s speed. One transition equals 1T (one cycle), two transitions equal 2T (two cycles).