Do you really need a photographic memory to be a super GM?
Click your heels together three times and say, "I do believe I can be a grandmaster, I do believe I can be a grandmaster, I do believe I can be a grandmaster." That's all it takes.

A photographic memory would be very useful, but not make-or-break.
The ability to recognize patterns is probably the game-breaker. And that does require memory, but not photographic memory.
No. Reshevsky and Spassky had a poor memory.
Reshevsky could not remember opening lines.
Spassky had to consult his score sheet in post game analysis.
Spassky also forgot a critical opening move Geller had told him for game 6 against Fischer.

No. Reshevsky and Spassky had a poor memory.
Reshevsky could not remember opening lines.
Spassky had to consult his score sheet in post game analysis.
Spassky also forgot a critical opening move Geller had told him for game 6 against Fischer.
You shouldn't take anecdotes for full face value. Those comments were probably half-jokes, not to be taken too seriously.

No. Reshevsky and Spassky had a poor memory.
Reshevsky could not remember opening lines.
Spassky had to consult his score sheet in post game analysis.
Spassky also forgot a critical opening move Geller had told him for game 6 against Fischer.
You shouldn't take anecdotes for full face value. Those comments were probably half-jokes, not to be taken too seriously.
I agree many anecdote about players are fiction. I don't play chess psychology only good moves is one of them. Another is I don't study Opening Theory.

No. You must know tactics & endgame. However, I'm not a super GM. I've got a good memory, not photographic I suspect but I do fine with chess at an expert level. 🙂♟️
@9
"Those comments were probably half-jokes, not to be taken too seriously."
++ No joking. Spassky lost this game:
https://www.chessgames.com/perl/chessgame?gid=1044366
Geller had told Spassky about the stronger 14...Qb7 as Geller himself asserted after this game:
https://www.chessgames.com/perl/chessgame?gid=1049648
An eye witness said Spassky needed to consult his score sheet in post game analysis.
Reshevsky could not remember opening lines. That is one reason why he always ended up in time trouble. Several contemporaries asserted that: Bronstein, Fischer...
They gladly exploited his weak memory:
https://www.chessgames.com/perl/chessgame?gid=1008376

Everyone mixes up his opening prep occasionally. Nakamura did that is the penultimate round of the Candidates. That doesn't mean that he has "bad memory". As I said, don't take anecdotes at full value.
Using the proper anecdote, everything can be proved or disproved. Oh wait, that is exactly what tygxc is doing. Every time.
But I’m curious if you really need a photographic memory for the top chess levels?