From that description, I would say if it turns up and doesn't work, you don't have a leg to stand on.
For £5-10 it's probably worth a punt (depending which CPU), but I would buy with the expectation of it not working, and be pleasantly surprised if it did.
For £5-10 it's probably worth a punt (depending which CPU), but I would buy with the expectation of it not working, and be pleasantly surprised if it did.