If the type of GPU is different, will the results of the same code not be exactly the same?

[studycreate11]

I ran a radio map code using Sionna RT on two different computers, each with a different type of GPU.

The resulting radio maps were very similar but not exactly the same.

Would running the same code on different types of GPUs lead to different results?

I used an RTX 4070 Ti and an RTX 3090.

[merlinND]

Hello @studycreate11,

Massive parallelism often involves some non-determinism, and that is the case for Sionna radio maps as well. In fact, even two runs on the same computer are not guaranteed to give strictly identical results due to some randomness in the order of computation.

[studycreate11]

I saw that the Radio Map Solvers have a SEED parameter.

It seems that having the same seed doesn't guarantee the same results?