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[REQ] Custom eGPU electronic parts  

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Mordo
(@mordo)
Active Member
Joined: 3 years ago
 

Hello everyone,

First of all my name is Alex and i'm pretty new in this segment of tech. I kept an eye on eGPUs since razer core was announced but never went into the deep of the concept. At first i wanted to buy Gigabyte's aorus enclosure, than the Omen Accelerator (which i will do if i cant get done what i want). 

Second i want to apologies if i posted in the wrong category, didnt know if this is the right one or the Custom eGPUs.

Now lets talk about the elephant in the room. I would like to build my own eGPU in a custom chassis (or miniITX case). I dont know enough about the eGPU electronic components so i dont know which one to buy. Basically i want the best (fastest, newer etc) 'motherboard' that will deliver the best performance out of a GPU. Also like the Omen Accelerator i would like to have at least 1 SATA connector for a ssd/hdd (will it decrease the performance of the GPU?).

Bonus question: Do you think i ll be able to run the eGPU with the new VEGA 56? Since i like the game performance being somewhere equal to a GTX 1070 but the compute power is much higher so it will help me in render operations.

In the end i'd like to thank you all in advance for your aswers, eGPU.io looks like a dope community tho Smile

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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3RYL
 3RYL
(@3ryl)
Eminent Member
Joined: 3 years ago
 

Hello and welcome

For now, because of Intel specifications the Thunderbolt eGPUs can only be sold as a complete enclosure. So you will need to buy one and disassemble to get the adapter board if you want to use a custom chassis. Bare PCB products are only available for passive NGFF/Expresscard/Mpci-E connection.

About the SATA port, from what I know every extra connection will eat a bit of the thunderbolt bandwidth, unless it uses a separate connection. You should check the buyer's guide for info about the enclosures.

Chimera ~ 2011 15" Dell Vostro 3550 HD6630M + [email protected] (PE4C 3.0) +Win7
My adapter models for eGPU case projects


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switch
(@switch)
Estimable Member
Joined: 3 years ago
 

ANY port on an enclosure (USB, Ethernet, SATA) will eat up bandwidth otherwise available for the eGPU (notable exceptions exist, involving a separate cable plugged somewhere else on the laptop). Technically, all "extras" are actually hosted on a USB hub and can never exceed more than 25% of the bandwidth normally available to the GPU. Which is, in itself, rather limited. Think something on the order of PCI Express 3.0 x2.5 (yes, I do mean two and a half). That's the real speed. And believe it or not, it's actually ok, with only modest performance impact (less than 20% compared to the same GPU on a x16 motherboard).

 

Also, as stated before, there are currently no Thunderbolt "motherboards" available - Intel only allows them to be sold as part of complete products. You can always buy an Akitio (or anything else) and strip it for parts if you so wish. You won't find "cheap" thunderbolt boards.

 

Currently the cheapest eGPU enclosure is the Aorus (or the Mac Dev Kit) since it also comes with a decent GPU that, in itself, pays for about 75-90% of the full enclosure+gpu price.

 

I gave up on things like the Mantiz or Omen which pack everything AND the kitchen sink in with the GPU. You only have so much bandwith (screw you, Intel!) which is much too precious to waste on trivial things that you can do without. Power + GPU is actually all that matters. And me I don't think (anymore) that it's justified to use any top-tier GPU in an enclosure. You'd actually need a hardcore CPU, extra-good cooling for the laptop plus 4K monitors.

2016 15" HP ZBook 15 G3 (Xeon E3-1545M, Iris Pro p580, no dGPU) + [email protected] (Aorus Gaming Box) + Win10pro
2018 15" HP ZBook 15 G5 (i7-8850H, HD630, Quadro P1000) + [email protected] (Aorus Gaming Box) + Win10pro


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Mordo
(@mordo)
Active Member
Joined: 3 years ago
 

Thank you for your answers!

Im pretty dissapointed about them tho.. I like to think about the eGPUs as a dock (y ik it sounds dumb, its called eGPU u jackass, not a dock). For the moment im rocking an LG 34" UltraWide [email protected] and i might buy a secondary display (for sure not with higher resolution) or upgrade this one with an ultrawide 1440p @>=100hz, so i guess i can just stick with the Accelerator for now cuz i could really use those ports also the SATA connector until i something better comes out. And at those resolutions i dont think something like a gtx 1070 or vega56 wont push enough fps to keep up with the refreshrate at a decent graphic level even with the other ports sucking up some juice. I ll use it with a xps13 9360 for the moment, i ll wait for the new xps 15 (i hope it'll rock a ryzen 5/7) and hopefully more and better TB3 connections (also who knows maybe we ll have pcie 4.0 as rumored to start showing up at the beginning of the year and the bandwith problem will be solved once and for ever). 

Btw i think the next TB port should work like the connector on the alienware amplifier, directly with the cpu not through the mb,  its so god damn much better.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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