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Intel TB3 throttle bypass?  

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saltynerd
(@saltynerd)
Active Member
Joined: 8 months ago
 

Recently built my eGPU . But kinda disappointed about the results perhaps attributed to the lack of homework done before hand. It turns out Intel throttles TB3 which from 40Gb/s to like 22Gb/s. I am wondering if there is a way to bypass this, or its due to hardware.

 

2018 14" Lenovo Thinkpad X1 Carbon Gen 6 [8th,4C,U] + GT 740 @ 32Gbps-TB3 (ADT-Link R43SL * M.2-TB3) + Win10 [build link]  

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itsage
(@itsage)
Illustrious Member Admin
Joined: 4 years ago
 

@saltynerd, Thunderbolt 3 bandwidth is capped at 22Gbps, no way around it unfortunately. Since you have the M.2 eGPU adapter, you can try connecting to the M.2 slot directly to get 32Gbps for the eGPU.

 

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2020 14" MSI Prestige 14 EVO [11th,4C,G] + RTX 3080 @ 32Gbps-TB4 (AORUS Gaming Box) + Win10 2004 [build link]  


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saltynerd
(@saltynerd)
Active Member
Joined: 8 months ago
 

@itsage, is this the case for all TB3 or its just the the ones with a dual port controller like I have on my laptop? Is it ever possible to achieve 40Gb/s with TB3 like it was advertised, or that's just theory?

 

2018 14" Lenovo Thinkpad X1 Carbon Gen 6 [8th,4C,U] + GT 740 @ 32Gbps-TB3 (ADT-Link R43SL * M.2-TB3) + Win10 [build link]  

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@saltynerd, The 40 Gbps can only be fully used if you have a display or two connected to the Thunderbolt 3 port. In that case DisplayPort signals are tunnelled through Thunderbolt up to 36.6 Gbps for the Apple Pro Display XDR without DSC (dual HBR3), and up to 34 Gbps for Dual DisplayPort 1.2 (HBR2). Any bandwidth that is not used for DisplayPort tunnelling over Thunderbolt, up to ≈22 Gbps, can be used for PCIe tunnelling over Thunderbolt.

 

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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