US$218 AKiTiO Thunder2 PCIe Box (16Gbps-TB2)  


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December 23, 2016 5:24 pm  

As per  AKiTiO Thunder2 PCIe Box

US$209 Amazon-US, US$218 bhphotovideo-US , €249 (fr)




AKiTiO Thunder2 PCIe Expansion Box


The portable Thunderbolt™ 2 PCIe expansion box provides an additional PCIe slot for systems that do not support or have enough available space for expansion cards. The external Thunderbolt 2 connection allows you to daisy-chain up to 5 additional Thunderbolt devices, making this the ideal plug and play companion especially when you have to take your system with you. Replacing the card is a simple matter of removing three hand tightening screws, so no tools are required.


Model No: AKiTiO Thunder2 PCIe Box
Part No: T2PC-TIA-AKTU (without PCIe card)
Certifications: CE, FCC, Thunderbolt™ technology

Case material: High quality aluminum with metal chassis

- 1 x PCIe card (see compatibility chart)
- Supports half-length, full-height and double-width cards
- PCIe (x16) slot provides a maximum of 25W


-2x Thunderbolt™ 2 ports
-1x internal PCIe (x16) slot with 4 lane PCI Express interface

Power supply

- External power adapter (UL, cUL, CE, FCC, BSMI, TUV approved)
- Input: AC 100-240V, 50Hz-60Hz
- Output: DC +12V/5A (60W)

Fan noise level: 23 dB(A)

Dimensions (LxWxH): 9.17 inches x 5.87 inches x 2.99 inches (23.3cm x 14.9cm x 7.6cm)

Package contents

- AKiTiO Thunder2 PCIe Box
- Thunderbolt_cable
- Power adapter
- Setup guide

GUIDE: DIY barrel plug adapter without soldering ... Used with a desktop ATX power supply [Yukikaze] here

GUIDE: Choosing a video card to fit in the unmodified Thunder2/Thunder3 chassis [enjoy] here image copied below:

 INFO: fitting unlimited length cards by opening the chassis here. Cards less than 215 mm long fit without any mods as seen here or link directly above.

Closing the AKiTiO Thunder3 will mean hot air can accumulate. Best is to leave it open OR at least drill holes matching the video card fan position to allow the fans to pull air in. I dressed my Thunder2 up with some black electrical tape around the edges and some sponge in the lower cavity. Looks good enough to leave open.

INFO: Slot power bypass mod here , alternate here  (eg: stabilizing AMD cards)

INFO: Dell DA-2 on/off using SENSE wiring here

INFO: 75W can be safely passed to the PCIe slot with an upgraded 90W or greater AC adapter

An AKiTiO engineer emailed me this info, quoted below:

We implemented the x16 PCIe slot although we only use x4 lanes signal that Thunderbolt can support. By spec the x16 PCIe slot is capable of 75W power while the x4 is spec’ed at 25W.. That means, if the user uses a power supply that is big enough, there is no problem that our design can support x16 PCIe card that requires 75W power. That is the reason why OWC’s PCIe Box has the identical PCBAs as ours but they shipped with the 120W power supply.

By the requirement of Intel/Apple, we need to reserve 30W power for the Thunderbolt circuits because it may need to provide power to the bus-powered downstream devices. That’s why we use 60W power supply but we only leave 25W for the PCIe card. For the eGPU application, users do not connect anything else to the Thunderbolt daisy-chain. In such case 10W for the Thunderbolt circuits should be enough and there is 50W to the PCIe card. In order to support 75W power to the PCIe card, users can simply upgrade the power to 90W or larger.


Adding soldered J6 header could achieve two things:

1. An INTERNAL method to supply up to 120W to drive the slot (75W) + additional circuitry.  That may be useful if trying to say house the AC adapter in the AKiTiO Thunder2/3.

2. J6 could be a tap off point to supply PCIe power if using say a 120W AC adapter plugged into the DC jack. 10W would be used for TB circuitry, J6 providing PCIe power via a custom lead and then provide up to 75W slot power. That could be a neat way to drive a slightly undervolted GTX1050Ti (120W TDP).


AKiTiO Engineer said:

You mentioned that you have the skills to modify the circuit board yourself, so with this drawing, you should be able to add a 4-pin connector to the pins labelled J6 for extra power. Having said that, the maximum power must NOT exceed 120W and as you said earlier, the modification is at your own risk.


Edited: 1 year  ago

eGPU Port Bandwidth Reference TableeGPU Setup 1.35

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