No, but you can still use this card if the CPU has hyperthreading. RTX 3070 needs at least 4 physical cores to function properly. While you can technically use an RTX 3070 with a CPU that has fewer than four cores, it is not recommended. The RTX 3070 will likely be bottlenecked by a lower-end CPU, which will result in lower frame rates and reduced performance in video games. A CPU with less than four cores will not be able to take full advantage of this card's capabilities.