Sapphire Vega 56 Nitro+ Limited Edition ...
 

Sapphire Vega 56 Nitro+ Limited Edition as eGPU. Can it be done?  

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OliverB
Posts: 1282
(@oliverb)
Noble Member
Joined: 8 months ago

Hello dear community,
I would really like to buy a Sapphire Vega 56 Nitro+ Limited Edition, but then I saw it has 3 x 8pin connectors. Can it be used as eGPU? Has somebody done it?

11

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joevt
Posts: 364
(@joevt)
Reputable Member
Joined: 2 years ago

Three 8-pin connectors means 450W. 75W for the PCIe slot. 525W total.

The following links say the card can draw up to more than 400W and less than 500W (Sapphire website has a Nitro+ and a Nitro LE but no Nitro+ LE?):
https://www.overclockersclub.com/reviews/sapphire_nitro_limited_edition_radeon_rx_vega_56_8gb_hbm2/9.htm
https://bit-tech.net/reviews/tech/graphics/sapphire-radeon-rx-vega-56-nitro-review/10/
https://www.sapphiretech.com/en/consumer/nitro-rx-vega56-8g-hbm2-le_c
https://www.sapphiretech.com/en/consumer/11276-01-nitro-rx-vega56-8g-hbm2

Seems like any eGPU with 500W available to the GPU should work. That means those with 500W highlighted in green that are listed at:
https://egpu.io/external-gpu-buyers-guide-2019/

I guess you need to check the available power rails and plugs, and figure out how to populate all three 8-pin connectors. There are nine 12V wires needed, 50W per wire 4.17A each. Standard 18 AWG wire is more than sufficient but 16 AWG is better (less voltage drop and melts at a higher temperature). This example product says 20A 240W for a two-wire 26in 14 AWG cable.

Or replace the eGPU's power supply.

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Posts: 5
(@jay_weeks)
Active Member
Joined: 3 weeks ago

I purchased one of these as well as a Razer Core X not realizing the power couplings didn't match.
The Core X supports up to 500W draw, and the Nitro 56 should draw max up to 450W according to its specs.
Would it be possible to find different cables / an adapter to hook it up to the power supply of the Core X enclosure?

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sabrefv
Posts: 33
(@sabrefv)
Eminent Member
Joined: 3 months ago

What type of PCI-E power connector and how many do you have in the razer core X? If the current power supply produces enough power can you use splitters to plug into the 3 x eight pin connectors? I'm not an expert on power.
this one
https://www.ebay.com/itm/PCI-E-6-pin-to-2x-6-2-pin-6-pin-8-pin-Power-Splitter-Cable-PCIE-PCI-Express/151501045756?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
 together with this one
https://www.ebay.com/itm/60cm-18AWG-6Pin-Male-to-6Pin-Male-Video-Graphics-Card-PCI-E-Power-Adapter-Cable/173414879050?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

those two will split one 6 pin PCI-E power cable into 2 x 6pin+2 which will connect up 2 of the 8 pin connectors if you can use a splitter.

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Posts: 5
(@jay_weeks)
Active Member
Joined: 3 weeks ago

Yeah, I did a bit more research and got a female 8 pin to 2x 6+2 pin adapter.
The power supply has 2x 6+2 pin cords, so I split one to supply the 3x 8 pins on the GPU and it seems to be running well.

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sabrefv
(@sabrefv)
Joined: 3 months ago

Eminent Member
Posts: 33

@jay_weeks this is good news. I was reading back over @joevt post and it seems like as long as the power supply's 12v rail (hopefully there is only one 12V rail supplying all the power) can supply enough power to both 2 x 6+2 pin cords (one of which is split into 2 cords) you should be good and can continue to supply power to the GPU without any interruptions. Good to see it is working ok so far.
@oliverb looks like @jay_weeks accomplished what you were looking for at the beginning of the post with a razer core x enclosure and the Vega 56 Nitro!!

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OliverB
(@oliverb)
Joined: 8 months ago

Noble Member
Posts: 1282
Posted by: sabrefv

@oliverb looks like @jay_weeks accomplished what you were looking for at the beginning of the post with a razer core x enclosure and the Vega 56 Nitro!!

@sabrefv
Are you sure about it? Keep in mind that there is a Vega 56 Nitro and a Vega 56 Nitro+ Special Limited Edition. Only the latter one needs the three power cables... 🙂

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sabrefv
(@sabrefv)
Joined: 3 months ago

Eminent Member
Posts: 33

@oliverb
@jay_weeks is plugging in 3 x 8 pin power cables into his GPU so I'm assuming he has the Nitro+
There are two 6+2 pin power cables coming from his razer core x enclosure's power supply.
One of those he plugs into one set of 8 pins. For the other cable he has installed a splitter cable (1 x 8 pin female to 2 x 6+2 pin male) giving him 2 x 6+2 (2 x 8 pins) which he plugs into the other two sets of 8 pins on his GPU. That's 3 x 8 pins.
At least that's how I understood it from his description..

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