Overvolting memory might lead to problems for the CPU.
Overvolting memory might lead to problems for the CPU.
1.9v is seen as the upper limit for DDR4, mainly to handle voltage spikes. It's likely okay for short periods, though I wouldn't use it every day. 1.2v to 1.5v is usually better for regular use. Overvolting doesn't harm the CPU itself, but could affect your memory.
Increasing voltage to the DRAM won’t harm the CPU, but boosting it on the memory controller might. For Intel, aim to keep VCCSA and VCCIO below 1.3V during regular operation; some sources suggest 1.35–1.4V is equally safe. Even at around 4000MHz, you shouldn’t exceed about 1.2V. A voltage of 1.6V on the SA/IO rails is likely to cause immediate failure. On Ryzen, roughly 1.2V is considered safe for the SoC, though I’m not entirely confident. Generally, target a daily system running at about 1.5V, and 1.6V is fine with quality components and stable temperatures.
However, that's incorrect. Most references to 1.9v relate to Samsung B-Die kits, especially premium devices. The claim that all DDR4 support 1.9v is misleading—it depends on the specific die. I've tested 1.9v and the memory still functions. Running at 2.2v is possible only under very extreme conditions like LN2 cooling.