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I've been watching Buildzoid's vids for a while and that makes me curious about the mosfets that the manufacturers have been putting in the motherboard. Particularly, Biostar has never seemed to me to be featured in Buildzoid's review, at least for a few years back, and Asrock has seemingly decided to replaced all of the Nikos Mosfets with something else (but still pretty garbage, as shown in the HWUB's recent videos).

I decided to dig through many of buildzoid's vids, some Chinese sites and dozens of datasheet to compare the RDS(on) of the various models of Mosfets that are used in the low-side, and to summarize it all in tables for you. I hope this will make a decent reference point of how good/bad the VRM should be.

The table is sorted by Max. RDS(on) at 10v, breaking ties with 4.5v values.

Mosfet Model	Max. RDS(on) @ 10v	Max. RDS(on) @ 4.5v	Notable board vendors	Notes
OnSemi - 4C024	2.8 mR	4.0 mR	MSI	Found on most budget MSI boards.
Nikos - PK632BA	3.3 mR	4.0 mR	MSI	Alternative for 4C024N on MSI boards, slightly higher RDS and quite a bit slower. May found in the same model using 4C024.
OnSemi - 4C06	4.0 mR	6.0 mR	ASUS/Gigabyte	Bog standard mosfets for cheap Gigabyte boards.
OnSemi - 4C028	4.7 mR	7.0 mR	Biostar	Found in the top of the line Z490 GTA (EVO) with 12-phase 1H1L setup. (Really, BIOSTAR?)
SinoPower - SM4336	5.3 mR	7.5 mR	Asrock
Nikos - PK618BA	5.5 mR	6.8 mR	Asrock	Alternative to SM4336, may found in some batch of the same model. Possibly superseded by 3906X
Potens - PDEC3906X	5.5 mR	8.5 mR	Asrock	Found in the most recent cheap boards made by Asrock (such as some batch of Z490 Pro4 or Z490 Phantom Gaming 4). Covered by HWUB and it's unsurprisingly garbage.
SinoPower - SM4364	5.7 mR	7.6 mR	Biostar	Found in cheap Biostar B460 boards.

Here's my rough interpretation of the 10v RDS(on) of the low-side mosfets based on Buildzoid's. Note that sometimes Quantity beats Quality (and vise-versa) but the table below represent one individual mosfets.

RDS(on) Range	Interpretation
Less than 2 mR	Very good, usually found in high-end VRM setups.
2 - 3 mR	Decent, especially for cheap boards.
3 - 4 mR	Questionable. It better be in 1H2L or 2H2L setup to be acceptable per-phase.
4 - 5 mR	Quite bad. Needs lots of 1H2L or 2H2L phases to be at least palatable.
More than 5 mR	Terrible. Only suited for the bottom-of-the-barrel boards.

RDS(on) vs Q(g)

As suggested by u/T2098, I should also look into gate charge parameter Q(g). I look into the datasheet once again and below is the table showing the results. The value for PDEC3906X is estimated because the data for 10v is not available, but the value should be just over 2x the 4.5v parameter.

Mosfet Model	Max. RDS(on) @ 10v	Typ. Q(c, total) @ 10v	Resistance - Charge Product
OnSemi - 4C024	2.8 mR	30 nC	84.0
Nikos - PK632BA	3.3 mR	42 nC	138.6
OnSemi - 4C06	4.0 mR	26 nC	104.0
OnSemi - 4C028	4.7 mR	22 nC	103.4
SinoPower - SM4336	5.3 mR	29 nC	153.7
Nikos - PK618BA	5.5 mR	28 nC	154.0
Potens - PDEC3906X	5.5 mR	~23 nC* (11.1 @ 4.5v)	126.5*
SinoPower - SM4364	5.7 mR	25 nC	142.5

If there are some mosfets missing from the list, you can always bring it up in the comment section.

submitted by /u/rngwn
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(Semi Engineering) Fundamental Changes In Economics Of Chip Security

Posted: 12 Jun 2020 06:10 AM PDT

submitted by /u/RandomCollection
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Looking for updated costs on quantum dots

Posted: 12 Jun 2020 11:05 AM PDT

It sounds like there have been major advances in the development in quantum dots, especially non-cadmium QDs.

Is the current cost of advanced QDs public knowledge ?

I'm thinking about QDs developed by the likes of Nanosys.

submitted by /u/TallnFrosty
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Are there any affordable thunderbolt NVME enclosures? Why so expensive?

Posted: 12 Jun 2020 10:55 AM PDT

Looking around for a thunderbolt 3 enclosure that can host an NVME drive.

USB-C 10Gbps enclosures using Asmedia or Realtek chips are quite cheap, like $20-$30.

However, anything TB3 is in the $120+ range!

Is this just a demand thing? The alpine ridge chips cost less than $10 each, so it's frustrating that these enclosures are so damn expensive.

Some options I've found:

Bundled with a drive:

Samsung X5 ($400 for 1TB)
Sabrent Rocket ($350 for 1TB)
Plugable NVME ($300 for 1TB)
Visiontek ($175 for 1TB) - JUST found this one while researching this post. Not sure which SSD's they use in it but this is the most affordable by far. Not sure of quality.

Sold separately:

Orico TB3 enclosure, runs $130-$160
Trebleet TB3 enclosure, $130 on amazon
Fledging TB3 active cooling - $140
TekQ Rapide or Cube, $130 on amazon
IO Crest, $130 on amazon
Wavlink, $100, bad reviews
Jeyi TB3 enclosure, $90 (about the cheapest I've found)

Is there really nothing in the $50 or under range for TB3? It also is frustrating that most of these are running the older JHL6340 chip launched in 2015, and TB4 is around the corner. If the chips were at least Titan Ridge it would be nice so they could fall back to USB-C as needed, but I can't find any enclosures with those chips.

Anything I'm missing? Just go with a cheap RTL9210 10Gbps enclosure for now and wait for TB4? Try to find something used?

I'm currently leaning towards the Jeyi for $90 + a WD SN750 for $110 = $200 total, but even that feels like a splurge to me.

submitted by /u/zerostyle
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Hardware support: Amazon lists AMD Ryzen 3000XT series, launching July 7th - VideoCardz.com

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