Usb c bandwidth12/11/2022 ![]() ![]() But now there are no lanes remaining for USB 3.1 data. To the computer and the external monitor, this still looks exactly like a regular DisplayPort connection. If you want 4K 60Hz, 5K, or multiple external monitors, then you’ll need to use DisplayPort Alternate Mode with all four lanes for DisplayPort data, as shown in the bottom rows of the table. To keep a 60 Hz refresh rate, you need to step down to 2K or lower resolution. #Usb c bandwidth windows#That’s OK for watching movies, but a 30 Hz Windows or MacOS desktop experience is painful. Two lanes for DisplayPort provide enough bandwidth for one external monitor at up to 4K 30Hz. To the computer and the external monitor, this looks exactly like a regular DisplayPort connection. In this case the USB-C connector functions like a DisplayPort connector with a different shape and some extra wires for USB data. These two lanes can be repurposed to carry a native DisplayPort signal, using what’s called DisplayPort Alternate Mode, as shown in the middle table rows. The other two lanes are essentially wasted (they will be used by USB 3.2). USB 3.1 Gen 2 only uses two of the four lanes, as shown in the top two rows of this table. Let’s look at what happens when DisplayPort is added into the mix: There’s also a fifth differential pair D+ and D-, that carries old-style USB 2.0 data. USB-C connectors have four differential pairs called “lanes” for carrying high speed data. The 24 pin USB-C connector is the key to understanding. ![]() Otherwise I’m not aware of any difference between these two DisplayPort types.īandwidth Tradeoffs – It’s All About The Lanes Regular DisplayPort connectors can’t do this, and require an active HDMI adapter with more built-in smarts. This is because DisplayPort video can be carried more efficiently on the USB-C connection than HDMI for the same resolution and refresh rate.ĭualMode DisplayPort++ connectors are able to function as HDMI connectors with a simple passive adapter (it does 3.3V to 5V level conversion). I strongly suspect most hubs with an HDMI port are actually implemented internally as a DisplayPort, with an integrated DisplayPort to HDMI converter. You’ll never find a USB-C hub that offers better video capabilities through its HDMI port than through its DisplayPort, but you will find hubs that offer better DisplayPort resolution and refresh rates. Lesson 1 is to focus on DisplayPort video connections, and forget about HDMI. October 2020 Update: see the notes at the end of this article about how DisplayPort 1.4 changes the landscape. If you’re hoping to connect a high-res external display to your USB-C equipped computer, read on. This is the guide to high-resolution video over USB-C that I wish I’d had. Prices range from $20 to over $300 for what look like very similar features. There are mentions of alt mode and dual mode and more. Some are advertised as “not for gaming use”. Supported resolutions and refresh rates vary widely. USB-C hubs with external monitor support are also common, but understanding their capabilities and limitations can be extremely confusing. USB-C converters to DisplayPort or HDMI are common and inexpensive. USB-C offers exciting new capabilities, including external monitors connected through the USB port. ![]() Gregg Lemke on Yellowstone Universal Disk Controller for Apple II.Hightray on Floppy Emu Disk Emulator for Apple II, Macintosh, and Lisa.Steve on Floppy Emu Disk Emulator for Apple II, Macintosh, and Lisa.John Payson on NMOS 6502 Phantom Reads, Odd Yellowstone Bugs.Jeffg on The Amazing Disk II Controller Card.Yellowstone Universal Disk Controller for Apple II Floppy Emu Disk Emulator for vintage Apple II, Macintosh, and Lisa ![]()
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