Playing around with the mismatched RAM modules
Playing around with the mismatched RAM modules
Hey there, I upgraded my CPU six months back and had these RAM sticks ready: two 8GB 2133Mhz CL14 models and two 8GB 2400Mhz CL15 models. To match my new processor’s speed, I installed them at 3200Mhz speeds. They all passed the memory tests and kept my PC running smoothly for months without any problems. The overclock helped a lot. Now, since I needed 32GB of RAM (for compiling code, virtual machines, etc.), I bought a proper kit—Kingsgate Fury RGB with two 16GB 3200Mhz units (16-18-18-36).
Most advice says to stick with the 2x16GB setup and either remove the old sticks or sell them. But I’m thinking about trying 48GB instead for a bigger upgrade. I installed all four sticks, but now I can’t boot into my 3200Mhz configuration anymore. The 3000Mhz combo works fine, while the 2400Mhz + 3200Mhz mix only gets 3000Mhz. I’m trying to figure out why the 8GB 2133Mhz stick doesn’t boot at 3200 even with new RAM, but it did when paired with the older 2400Mhz one. I’ve been testing different combinations and hoping someone can help me understand this better. In the end, I’ll probably go with the newer sticks anyway.
Not uncommon. Various memory modules use distinct memory ICs, and these ICs need different memory controller settings for proper startup (these details are determined through memory training). As frequency rises, the acceptable parameter range shrinks; at 3200MT/s the overlapping settings disappear, preventing successful booting. Certain ICs perform well across high frequencies with minimal issues, while others struggle to reach JEDEC speeds when combined with other modules.