Hot on the heels of Gigabyte, ASUS has also put its Thunderbolt 5 card up on its website, although there are some differences between the two. Obviously the physical appearance differs somewhat, but that's largely cosmetic. However, the one key difference is that the ASUS ThunderboltEX 5 only sports a single 6-pin PCIe power connector. ASUS still claims USB PD support of up to 130 W—a feature the company calls Flexible FastCharge—however, a single USB Type-C port is limited to a maximum of 96 W, which means you can charge your MacBook Pro at full tilt, but not some other laptops. Admittedly the 4 W discrepancy compared to the Gigabyte card is fairly minor, but the second port gets left with only 34 W, although that's still enough for charging most phones. Oddly enough, ASUS ThunderboltEX 4 card, allowed for up to 100 W on a single port.

ASUS has also implemented a single Thunderbolt 5 pin-header for the GPIO, SPI I2C and UART interfaces, plus a standard USB 2.0 header, for adding USB 2.0 support to the Thunderbolt 5 ports. Just as with the Gigabyte card, we find Intel's JHL9580 Thunderbolt 5 controller at the heart of the card and once again it uses a PCIe 4.0 x4 interface and supports up to three DP 2.1 8K displays at 60 Hz, although ASUS mentions that this requires DSC. The card features three mini DP inputs and comes with three DP to mini DP adapters, as well as the two aforementioned USB Type-C ports. Note that if you use tree displays, you can only use two Thunderbolt devices with the card. ASUS only mentions Windows 11 64-bit support, so it looks like Windows 10 won't be getting a driver and so far it would seem neither is Linux.

Gigabyte has quietly added the first Thunderbolt 5 add-in card to its website under the rather unimaginative name of Thunderbolts 5. The card itself is nothing remarkable when compared to Thunderbolt 4 add-in cards, although it sports a third mini DisplayPort input for unclear reasons, as well as two USB Type-C outputs. This time around Gigabyte has added support for more power though, as the card features a pair of what appears to be 6-pin PCIe power connectors and the card supports up to 100 W USB PD charging. Courtesy of the new JHL9580, or Barlow Ridge controller, the card offers support for DP 2.1 with resolutions of up to 8K at 60 Hz, as well as data speeds of up to 80 Gbps, or 120/40 Gbps in asymmetric mode.

Intel's JHL9580 controller has a PCIe 4.0 x4 host interface, the same as ASMedia's ASM4242 USB4 host controller and it's a big step up from Intel's previous Thunderbolt 4 controllers that were stuck with PCIe 3.0. Note that the JHL9580 is also offered in a Thunderbolt 4 version known as the JHL9540 which also uses a PCIe 4.0 x4 interface and offers DP 2.1 support, but slower speeds. Both of the new Barlow Ridge controllers also support USB 3.2 Gen 2x2 (20 Gbps), something previous Thunderbolt controllers didn't. Intel has a list price for the JHL9580 of US$19, which is just over US$8 more than the JHL8540 Maple Ridge controller which launched in 2020, as such, expect Thunderbolt 5 add-in cards to come at an even higher price point than previous Thunderbolt 4 add-in cards. Gigabyte might be first out of the gate, but we expect most motherboard makers to follow suit with products of their own before the end of the year.