Thanks for this long answer. It's what I expected. So I will take the 4 CORE and try to pass the work on GPU.
And for my funny mis-translation, you're right, but the I think the error was from english to french. In france, we say "coeur" instead of "core", "coeur" means "heart"... and a good translation for "core" will be "noyau", but we don't use it.