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Discussion: HW.4 Suite - Availability, retrofit, suitability etc.
- Thread starter SageBrush
- Start date
It does actually. They would not make it if it weren’t a huge improvement: interconnect, cooling, raw computing power, upgradability, resolution and the effect that has on maximum speed. All a big deal. It’s such a big deal that Tesla was willing to sacrifice backwards compatibility with millions of cars. And likely they over engineered it because they won’t want to make such a big change again for a while.
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stopcrazypp
Well-Known Member
The drop in backwards compatibility in the form factor is more to prepare for future iterations (like HW5) than necessarily HW4 itself being the leap. The major change was the elimination of the GPU daughterboard (which is the MCU part, nothing to do with AP/FSD part), the rest looks like it would still largely fit on a HW3 form factor. So while there is now plenty of room to grow, HW4 doesn't really use the form factor yet to its fullest.
You can see for HW4, the general purpose CPU went from 12 cores (3x4) 2.2GHz to 20 cores (5x4) 2.37 GHz. That's a 1.8x bump, which may seem like a lot, but those are Cortex A72s which are very old cores, about akin to old smart phone level and not really responsible for most of the computing power of the chip.
From here, 4 Cortex-A72 @1300MHz gives 41.6 GFLOPS (FP32), which works out 211 GFLOPs (0.211 TFLOPs) for HW3's CPUs to 379 GFLOPs (0.379 TFLOPs) for HW4.
First OpenCL Encounters on Cortex-A72: Some Benchmarking - CNX Software
The core of the computing power is in the NPUs (or TRIP as described by Tesla). which are measured in TOPs, and the CPUs turn into a rounding error in comparison. Depending on which number you believe, HW3 was either 73 TOPs or 144 TOPs. That went from 2 NPUs to 3 NPUs or a 1.5x bump so either 105 TOPs or 216 TOPs. It's a decent incremental bump (which is speculated to help for the higher resolution cameras), but not exactly a leap (even green noted this).
Some references here and you can see the change from HW2.5 to HW3 was actually a leap (Tesla claimed 7x improvement from 21 TOPs to 144 TOPs).
Tesla's New HW3 Self-Driving Computer — It's A Beast (CleanTechnica Deep Dive) - CleanTechnica
FSD Chip - Tesla - WikiChip
I would say however the HW4 camera quality is a ton better, especially if you rely on dashcam:
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Is there any information about phantom breaking on HW4?
I've had my HW4 MYLR for exactly 1 month now, I was really worried about phantom breaking, but so far I've not experienced it at all after 2000 miles of driving. I do use Autopilot extensively, even at night too.
After comparing HW3 video footage with HW4 footage, I think reduction in headlight glare might be even more beneficial than increased resolution? It's probably much easier for the computer to process where the nearby vehicles are with reduced glare?
I've had my HW4 MYLR for exactly 1 month now, I was really worried about phantom breaking, but so far I've not experienced it at all after 2000 miles of driving. I do use Autopilot extensively, even at night too.
After comparing HW3 video footage with HW4 footage, I think reduction in headlight glare might be even more beneficial than increased resolution? It's probably much easier for the computer to process where the nearby vehicles are with reduced glare?
hasselboxster
Member
Curious the source of the VIN #s. I missed out on something like this with my Model 3, build date was actually AFTER Tesla's range but still didnt have the right harness for a retrofit.
I am looking at a PF841 - based on your logic should have HW4, then.
hasselboxster
Member
Look at post 230 here:
FSD Transfer - NO - but Tesla says it's really OK
oh no no no .. the text says "included at time of delivery of the new Tesla vehicle" Right. it had to be included when the vehicle you're moving FSD from was delivered new. hence why people who added it after the fact were told they don't qualify- including one who was told there's a code in...
teslamotorsclub.com
![[Zombie]](/tmc/data/avatars/l/236/236453.jpg?1658216431){kind=avatar}
[Zombie]
Member
There are a couple of threads on reddit where helpful people with "repairer" access to Tesla's EPC were looking up VINs and confirming what parts they were built with.
Tesla don't always build in VIN order so if you're within the changeover range then you can't guarantee you have the new parts - which likely happened with your Model 3 - but any Model Y built in the USA in the last month or so will have HW4.
This thread says
Austin HW4 switch date: Jun 4 2023. (VIN PA131200 ++ - all VIN after do have HW4)
Fremont HW4 switch date: May 24 2023. (VIN PF789500 ++ - all VIN after do have HW4)
And this thread says
I'm no longer doing lookups for Austin/Fremont VINs. HW4 is rolling out to Austin (VIN A130xxx +) and Fremont (VIN 798xxx +).
Yes it should. But if you want to be 100% sure you can ask the poster on the 2nd thread to do a full lookup of those VINs for a small donation.
Matrix headlights would be nice, wasn't expecting those on an Austin LR build - I'm also waiting for 7SAYGDEE5PA15XXXX here. To be delivered within a week or so.Just got my VIN assigned today ... 7SAYGDEE0PA15XXXX. Sales Associate confirmed I have both HW4 and Matrix headlights. Delivery 8-15 August; in transit from Texas to Washington.
Jaymc5
Member
Matrix headlights are totally useless because there is no software to control the actual matrix part AND there is no mention of when it will be released.
It seems Tesla is to busy making zombie games for the infotainment part, to actually code stuff that matters like matrix headlights...
gtae07
Member
Tesla apparently can't enable the full matrix capability yet because the regulations in the US haven't caught up to the technology. Until the government gets around to specifying how they must/are allowed to work, we're stuck with them emulating "dumb" headlights.
Dogs_In_A_Pile
Member
But according to the results from the IIHS Headlight Test they are superior to the reflectors, mostly in turns, even just being dumb headlights.
That might be an explanation for the US, but here in Europe Matrix headlights have been accepted, so why not enable it for our markets ?
The FSD for cities has been enabled in the US, even though it has apparantly not been approved for use in Europe.
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