I did a bunch of driving yesterday and got to compare HW3 in my Model 3 on 2024.14.6 and HW4 in the Model Y with 2024.3.25
Both with FSD 12.3.6, the Model 3 is on its 30 day trial. I got to drive >100 miles I each car on a good mix of highway and regular roads.
I'd forgotten how much I miss the accuracy of the USS when parking, so much nicer that the hand waving of the cameras.
The two cars were much closer than they were with 11.4.9.
The Y really did seem to spot traffic lights and other cars much sooner than the 3, but overall the difference is much smaller than it was with 11.4.9 and earlier.
Both versions displayed the same issues, I was curious to see if there was a difference. Still ignores speed limit signs over 60 if the road isn't divided, still has the fetish with the left lane.
Not sure if I'm disappointed or not with the lack of difference, if they're that close what was the point in upgrading all the hardware?
I remember reading that musky said that FSD was targeting HW3 and that HW4 was running HW3 emulation - but that was probably at the time when he was wanting to stop people waiting for HW4 cars
[edit]
Obviously HW4 does improve visible camera quality and clarity on the display, but I was looking for FSD differences