Whether or not more cores can help a task be completed quicker on a PC depends on the specific task being performed and the software being used to perform it.

Tasks that are highly parallelizable and can be broken down into smaller, independent sub-tasks can benefit from having more cores. This is because each core can work on a separate sub-task simultaneously, which can lead to faster overall processing times. Examples of such tasks include video rendering, scientific simulations, and certain types of data analysis.

On the other hand, tasks that are not easily parallelizable, such as single-threaded applications, may not see a significant improvement in performance with more cores. In some cases, adding more cores may even slow down the task if the overhead of coordinating multiple cores outweighs the benefits of parallelization.

In addition, the software being used to perform the task must also be designed to take advantage of multiple cores in order to see a performance boost. Not all software is multi-threaded, and some may not be able to utilize more than a certain number of cores, even if they are available.

Overall, having more cores can potentially lead to faster processing times for certain tasks, but it is not a guarantee and depends on a number of factors.