Albert Einstein was traveling on a train. When the conductor came to him to collect the ticket, he began to search his pockets. The conductor could recognize him and said that he could ride for free. Then Einstein replied, "Thank you, but if I don’t find my ticket, I wouldn't know where to get off the train."
Einstein’s memory was too poor to remember even his phone number and dates. He often forgot his appointments. His memory was poor but it is universally perceived that he held a higher level of IQ though his IQ was never tested. The anagram for him is Ten Elite Brains.
Modern civilization is largely based on Einstein’s E=mc².
Now let me analyze briefly whether IQ relates to poor memory. Einstein believed that the true sign of intelligence was not knowledge but imagination. I think he imagined more than gathering knowledge in his lifetime. He was an absent-minded person.
Knowledge is kept static in the human brain while imagination flows ahead all the time. Although knowledge and imagination contribute to each other to be developed, imagination can be more important than knowledge in creativity and intelligence.
According to research, one’s memory is importantly waved by the flow of imagination making the memory unsteady. Hence, having a higher level of imagination causes poor memory. In my opinion, in terms of higher intelligence and creativity, it is better to have a higher level of imagination with more forgetfulness than a sharp memory with poor power of imagination.
It is therefore not only possible to have poor memory and high-level IQ simultaneously but also sometimes a poor memory might be the sign of having a higher IQ.