2021 13" ASUS ROG Flow X13 (GTX1650) [R5K,8C,H] + RTX 3080 @ 64Gbps-XG (XG Mobil...
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2021 13" ASUS ROG Flow X13 (GTX1650) [R5K,8C,H] + RTX 3080 @ 64Gbps-XG (XG Mobile) + Win10 20H2 [aquaeatrae] // Quest 2  

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Eminent Member
Joined: 4 years ago


Yeah, I'm surprised we haven't met more #VanLife RV enthusiasts here. eGPUs fit a perfect niche for power, flexibility and portability. Seems ideal for playful folks living with various power and space limitations. While college students are starting to discover eGPUs, there's also many retirees, boondockers, and road warriors who telecommute from recreational vehicles these days. It's great to be able to play or cut videos while on shore power (campgrounds hookups, etc) yet bounce about carefree otherwise.

In my case, I've had two minivans over the years rigged for car camping. Decades ago, I spent one a college summer homeless and living out of a SUV in the Rocky Mountains. I enjoyed it actually. I've had a healthy career in IT since those days and now rent a room in a suburban home. But for the last decade, I've worked at a mountainside land trust that operates off-grid with a small ~50 kW microhydroelectric power system. Although most of my work is done remotely, I'll sometimes work on-site living out of my van for months at a time. As I go, I slowly build out the van with creature comforts and gizmos. Despite being an hour from the nearest town, work just happens to be located along an old fiber optic backbone. So ironically my gaming latency can actually be better in this remote mountain location than the bustling metropolis I call home.

More recently, I've begun building up a deployable solar charging system for vacations while away from power sources (national parks, etc). I recently bought two Lithium Ion batteries providing 200Ah to my 1250W invertor with Victron Energy management. But with the Flow X13, I believe I'll be able to charge the Asus' 2-in-1 from this tiny 12V USB-C PD adapter for non-gaming use [to be tested]. The DC adapter would avoid wasting lots of power compared to the much larger 120V AC transformer.

The batteries also power an AC/DC fridge, DC heated sleeping pad, a tiny DC swamp cooler / cooling pad, custom security system, HAM radio, and a small AC microwave. I use a small pressurized water sprayer for showers with an InstaPrivy (a pop-up port-a-pottie) where I need privacy. When connected to shore power, I can game freely and use a 1200W Foreman Evolve grill for cooking almost anything. I'm also getting into ultralight backpacking, bikepacking, packrafting, and drones. I'm very lucky to have so many great toys and just need more time to play with them all.

I've been keenly interested in the eGPU movement for years. I have a nice desktop rig at home, but the eGPU concept is so elegant and would fit my #VanLife perfectly. I should be able to extend the lifecycle of this laptop if we manage to build future GPU options for this 8-lane cable [to be tested]. Years ago, I remember defending how then GPUs rarely utilized more than a few PCI lanes but with each new generation that appears less and less true. Thunderbolt 3 and 4 were promising and seem to just manage today's GPUs, but I don't foresee the stadnard expanding bandwidth in the future without optical cables. 

For me, the thing that finally got my eGPU investment was seeing all-day ultrabook battery life combined with good CPU performance for gaming ...that and the fact I'd always wanted to try a 2-in-1 form factor. So despite being an Intel fanboy since the days of my IBM PC 8086, I went with my first AMD purchase here. Also, the RTX 30xx generation of GPUs saw the major uplift I'd been expecting. I'm super happy with it so far. Just planning how I'll arrange it in the van (with a mind toward larger eGPU enclosures potentially in the future).


#VanLife with solar productivity + microhydroelectric gaming

2021 13" ASUS ROG Flow X13 (GTX1650) [R5K,8C,H] + RTX 3080 @ 64Gbps-XG (XG Mobile) + Win10 20H2 // Quest 2 [build link]  

Lester Nightfly, hungsu, odin and 1 people liked
Founder Admin
Joined: 4 years ago

@aquaeatrae, What is your life?! Never have I wanted so badly to sell the house, cars, and dogs to hit the road. Enjoy in good health!


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2020 13" MacBook Pro [10th,4C,G] + RX 6700 XT @ 32Gbps-TB3 (CM MasterCase EG200) + Win10 1903 [build link]  

odin liked
New Member
Joined: 2 weeks ago

Congrats on your new gear! After couple of years using egpu setup I've decided to sell it and buy 2021 ROG Strix Scar 15 with rtx 3080 Smile Will see how it goes.

BTW, at the modding community we're trying various ways to improve overall performance of our laptops and since VBIOS modding is impossible these days, we are flashing em' from different manufacturers that has higher TDP. But using not ASUS VBIOS has it's cons... some things are just broken.

I wonder if you could help us and extract VBIOS from your EGPU? This could be done either via GPU Z:


or using CMD (admin) and nvflash command "nvflash -b rtx3080backup.rom":


Then just upload to Mega.nz or any other cloud storage.


To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.


Eminent Member
Joined: 4 years ago
Posted by: @musschrott

In case you're opening it up, do you see any space for a larger m.2 drive inside, ignoring that there is no way to screw it in place? A m.2 2242 might fit into the space? 2280 through an extender somewhere?
Could you measure the size of eGPU ports? That might shed some light if those are really Oculink ports.

I haven't opened the case quite yet. Looking at others who have (LaptopMedia disassembly video, NotebookCheck) and how thin the case is (below), I don't see a way to squeeze anything larger than a M.2 2230 in there. For the moment, the included 1TB drive is the largest available in that rare size [although that could change]. Looking at pictures of NVMe extenders, I think you'd have to cut through the case and out the bottom. Or perhaps if you removed the HDMI port and 3.5mm jack a flat cable could extend out the side. I suppose the more elegant solution might be able to 3D print a thicker case for an extender ...after calibrating all the dimensions. That bottom cover is a few inches wider than my printer can handle.

csm Asus ROG Flow X13 9 891aeb8624 from NoteBookCheck
20210406 095944

Not OCuLink 8i ?  What is OCuLink-2 ?

Physically measuring the eGPU cable, the PCIe male connector appears to be about 17.5mm wide and 3.0mm high. Regrettably, I believe that to be smaller than the SFP-8612 8i connector ...at lease given the specs I was able to find (source "OCULINK 8X RECEPTACLE Right Angle SMT shell leg DIP length 2.9mm tape and reel package"). Below, I've aligned the female port shown on in the diagram with the 300dpi scan and photograph I gathered. According to the diagram, it's about 3mm smaller width. If I try counting the tiny XG Mobile pins, I think I'm seeing 64 pins there whereas there would be 80pins on an OCuLink 8i cable (source).

Both the male and female ends came with black plastic covers which I placed on the platen of my scanner (300dpi) for the best accuracy.

XG Mobile port covers scanned 300dpi and compared


20210406 091901


20210406 092307
20210406 090629

A QR code on the male cover simply reads "6017B1599801A010000000ZF". I assume that's an Asus internal SKU for the plastic cover.


Mind you, I'm still not completely clear about the OCuLink connector (a use of the "MiniLink" connector apparently), its exact relationship with "SFF-8611" and "SFF-8512". Are these just "OCuLink-1" perhaps? I believe the "8i" designator is for 8-lane implementations. I was tempted to ship myself a desktop OCuLink PCIe adapter (PE0805 $80 USD) and dual NVMe expansion (PD893A $169 USD) just to experiment against, but if my measurements are correct they won't fit ...much less detect the toggle switch and be pinned out correctly. 

I think it was @itsage who posted on reddit about these being "OCuLink-2" cables, but with a proprietary pinout. Did that Asus Director offer any more specifications? The only mention of "OCuLink-2" I've found were here and here (cable pictured with 80pins I think). @joevt once compared the bandwidth of OCuLink vs OCuLink-2 here in the forums. Perhaps they know more.

#VanLife with solar productivity + microhydroelectric gaming

2021 13" ASUS ROG Flow X13 (GTX1650) [R5K,8C,H] + RTX 3080 @ 64Gbps-XG (XG Mobile) + Win10 20H2 // Quest 2 [build link]  

musschrott and itsage liked
Noble Member
Joined: 4 years ago

@aquaeatrae, it seems unlikely that it's an OcuLink connector. It appears to have 62 pins - 31 pins per side, dimensions: 18 mm x 3 mm.

oculink 4X 42 pins - 21 pins per side, inside shell: 12.85 x 2.83 mm
oculink 8X 80 pins - 40 pins per side, inside shell: 22.35 x 2.83 mm

I can't find much info about OcuLink-2. There's an article at https://www.connectortips.com/oculink-connectors-cables-support-new-pcie-standard/ with a bunch of pictures but none are of OcuLink-2.

Specifications at:


- SFF-8611 MiniLink 4/8X I/O Cable Assemblies
- SFF-8612 MiniLink 4/8X Shielded Connector
- SFF-9400 Universal 4/8X Pinout
- SFF-9401 Universal Multi-Protocol Single Cable for SAS/PCIe

- SFF-8087 Mini Multilane 4X Unshielded Connector Shell and Plug - SFF-8448 SAS Sideband Signal Assignments
- SFF-8613 Mini Multilane 4/8X Unshielded Connector (HDun)
- SFF-8654 0.6mm 4/8X Unshielded I/O Connector
- SFF-9402 Universal Multi-Protocol Dual Cable for SAS/PCIe


- PCI Express® OCuLink Specification Revision 1.1 (1.0 is downloadable from elsewhere)



Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case

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