GreenCube runs on your machine, so your machine sets the pace. Ten seconds.
RAM, not storage. Not the hard drive or SSD space.
Most laptops have no separate card, and that is completely fine.
GreenCube runs on your own machine, so your machine sets the speed. There is one version and one price, €9.99 (US$9.99) paid once, and everybody gets everything.
About 8 GB of memory, no graphics card. Unlimited answers, reads your PDFs, looks at images, makes study material and files you can keep. The heaviest jobs start switched off and you can switch them on.
16 GB or more, no graphics card. A bigger AI, it writes slide decks for you, and it builds web pages after telling you how long they will take.
A graphics card with 4 GB or more. Everything with no waiting message, images read properly, and it remembers much more of a long chat.
A card with 8 GB or more and 24 GB of memory. The biggest AI your computer can hold, and it remembers as much as your memory allows.