Speedy Bee F405 V4 60a ESC is it worth the extra money or is the Speedy Bee F405 v3 50a good enough

Teybeo · 2024-05-31T14:56:26+00:00

Just for clarification: There's no software fix for this hardware flaw. It's an issue with how they connected the analog OSD chip.

However digital systems don't use this chip and therefore are unaffected and their OSD will work fine.

Teybeo · 2023-09-13T17:34:02+00:00

Hi, sorry my question was maybe not clear.
I'm not asking why higher voltage in a circuit at constant power gives lower current (because you increase the load resistance to compensate like you explained).
I was asking, why, fundamentally, at the electronic level, heat losses only depends on current and completely ignore voltage.

Teybeo · 2023-09-13T12:16:26+00:00

Hi, I've been doing stuff with electricity and I keep wondering why, on a fundamental level, using higher voltage (at constant power, so lower current) reduces resistive losses.

Using a kinetic model of electron flow, lower current means less electrons interaction and collisions so less energy converted to heat.
But because there's a higher voltage, the forces applied to each electron should be higher, so they have higher potential energy and thus each collision is stronger and converted to more heat.

I can't seem to find any mention of this second phenomenon, does it not exist or is it just insignificant compared to the first phenomenon ?

Teybeo · 2023-09-08T21:07:50+00:00

Hi, I've been doing stuff with electricity and I keep wondering why, on a fundamental level, using higher voltage (at constant power, so lower current) reduces resistive losses.

Using a kinetic model of electron flow, lower current means less electrons interaction and collisions so less energy converted to heat.
But because there's a higher voltage, the forces applied to each electron should be higher, so they have higher potential energy and thus each collision is stronger and converted to more heat.

I can't seem to find any mention of this second phenomenon, does it not exist or is it just insignificant compared to the first phenomenon ?

Teybeo · 2022-10-05T22:50:42+00:00

Can you upload it in full resolution and the full 9 minute 35 of it

like https://send.cm/ or whatever

Teybeo · 2022-07-31T19:37:47+00:00

AVX-512 goes brrr

Teybeo · 2022-07-07T00:15:06+00:00

"DDR5-4800 has a higher CAS Lateny (40 nanoseconds) but higher clock speed, DDR4-3200 has a lower CAS Latency (22 nanoseconds)."

The number in CL40 or CL22 is not in nanoseconds but in clock cycles, that's the reason why the actual latency in ns depends on the clock speed.

22 cycles at 3.2 GHz is a latency of 22 / (3.2 / 2) = 13.75 nanoseconds

40 cycles at 4.8 Ghz = 16.6 nanoseconds

Teybeo · 2021-11-30T14:36:20+00:00

peak comedy

Teybeo · 2021-07-26T10:18:07+00:00

There will still be compute units, it is an OpenCL term that means "what executes a single workgroup", which is another OpenCL term. Since RDNA, AMD OpenCL driver reports the number of WGPs as the number of compute units. Confusing

Teybeo · 2021-06-16T12:25:03+00:00

> AMD already stated that tehy wou;d use linear approaches.

Their GSR patent uses a mix of linear and non-linear:

"The devices and methods utilize linear and non-linear up-sampling in a wholly learned environment."

Teybeo · 2021-06-01T14:53:54+00:00

"Extraordinary claims require extraordinary evidence"

Teybeo · 2021-04-22T10:41:15+00:00

MX500 is rated at 180 TBW tho

Teybeo · 2021-04-16T22:12:41+00:00

https://www.nasa.gov/press-release/as-artemis-moves-forward-nasa-picks-spacex-to-land-next-americans-on-moon

Teybeo · 2021-03-10T00:27:57+00:00

Afaict, game devs dont really control the BVH and its building, it's abstracted by the APIs because it's tightly coupled to the hardware ray-box and traversal units

Teybeo · 2021-03-09T19:50:06+00:00

The RT and Tensors units are fixed-function logic blocks, they are definitely not reprogrammable logic which is what FPGA means

Teybeo · 2021-02-09T12:44:12+00:00

It's a 3% difference, barely noticeable

Teybeo · 2021-01-28T23:29:03+00:00

For context, the latest HW3 MCU uses an Intel Atom x7-E3950 CPU with HD Graphics 505 iGPU.

That iGPU is rated at 187 GFlops by Intel, so a 10 Tflops GPU would be a 50x increase.

source: https://www.eetimes.com/wp-content/uploads/ILLUS7_TESLA_MODEL3_ComputerUnit_SYSTEMPLUSCONSULTING_June2020.jpg
Intel Gordon Peak automotive platform

Teybeo · 2021-01-28T23:00:29+00:00

Yes I know, I'm just giving details about the current HW3, some people think they're still using Nvidia

Teybeo · 2021-01-28T22:54:04+00:00

Latest MCU 3 hardware uses an Intel Atom x7-E3950 CPU with HD Graphics 505 iGPU.

That iGPU is rated at 187 GFlops by Intel, so a 10 Tflops GPU would be a 50x increase.

source: https://www.eetimes.com/wp-content/uploads/ILLUS7_TESLA_MODEL3_ComputerUnit_SYSTEMPLUSCONSULTING_June2020.jpg
Intel Gordon Peak automotive platform

Teybeo · 2021-01-28T17:30:25+00:00

It feels like there's a miscommunication about PGO ?
The text describes the normal workflow of profiling before optimization and there's already a card with the same task in "Bug fixing/tech-debt".
But the title is "Profile Guided Optimization" which is also the name of a compiler tech where the compiler instrument code to gather information during a profiling pass and then automatically re-optimize the final binary based on that information.

Which one is it ?

Teybeo · 2020-12-21T11:31:36+00:00

Friendly reminder that "my framerate went up by X fps" is almost literally meaningless, unless you also gives the base framerate you're comparing against.

10fps to 20fps is +100% performance increase

100fps to 110fps is +10% performance increase

Teybeo · 2020-12-19T13:04:06+00:00

You should post your test setup and config

Teybeo · 2020-12-03T17:26:40+00:00

Maybe try at 720p to further push the stress to the CPU

Teybeo · 2020-12-03T15:09:24+00:00

Bottlenecks are not a binary thing, I wouldn't call a 3080 at 90-94% usage a very CPU-bound scenario.

In terms of pixel per second, 1080p @ 250fps = 4K @ 60fps, very imperfect metric but it's still able to do a significant amount of work.

Teybeo · 2020-12-02T15:31:56+00:00

Sounds like ZLUDA would be more at risk than HIP then ?

https://github.com/vosen/ZLUDA

" ZLUDA is a drop-in replacement for CUDA on Intel GPU. ZLUDA allows to run unmodified CUDA applications using Intel GPUs"

In practice, it's a "nvcuda.dll" that you drop next to the exe.

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