Sonnet eGFX Breakaway Box 650
Expert rating7 / 10
- Connection:
- Thunderbolt 3
- PSU:
- 650W
- Host Charging:
- 87W
- GPU Fit:
- Double-wide
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Manufacturer: Sonnet Last updated: 2026-09-12
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Sonnet eGFX Breakaway Box 650 (Thunderbolt 3 / 650W PSU / 87W Laptop Charging / Double-Wide GPU / Mac-Certified) Review
If you're comparing the Sonnet eGFX Breakaway Box 650 against the newer 750ex or 850 T5 to figure out which Sonnet enclosure fits your card,
the 650 is the mid-tier Thunderbolt 3 option, enough headroom for most double-wide RTX 30-series cards and official Apple eGPU certification, but if you're running anything RTX 40-series or larger you'll want to step up to the 750ex or the Thunderbolt 5 850 T5.
What It Actually Is
The Breakaway Box 650 sits in the middle of Sonnet's long-running eGFX lineup, between the smaller 350/550 boxes and the larger 750ex. It's a 650W internal supply in Sonnet's signature vented aluminum chassis, officially certified by Apple for macOS eGPU support, with 87W of laptop charging and room for double-wide cards up to 310mm.
Comparison to Alternatives
Sonnet's own eGPU Breakaway Box 750ex adds 100W more PSU headroom and a built-in USB hub plus Ethernet, which is worth the extra cost for RTX 3080/3090-class cards. The flagship Sonnet eGFX Breakaway Box 850 T5 goes further still with Thunderbolt 5 and 100W charging for RTX 40/50-series cards. If you're running an RTX 3060 or 3070-class card on a Thunderbolt 3 Mac, the 650 is the right-sized, cheaper choice over either.
Specifications
Identity
| Brand | Sonnet |
|---|
Connectivity
| Connection Standard | Thunderbolt 3 |
|---|---|
| Extra Ports | None onboard beyond the GPU's own outputs |
Power & Compatibility
| PSU Wattage | 650 W |
|---|---|
| Host Power Delivery | 87 W |
| Max GPU Length | 310 mm |
| Cooling Type | Active Fan |
| Model | eGFX Breakaway Box 650 |
|---|---|
| GPU Compatibility | GTX 10-series through RTX 30-series and equivalent AMD cards, double-wide |
| Price | Launched around $449 (2018) |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating7 / 10
The right-sized Sonnet box for mid-range Thunderbolt 3 cards, officially Mac-certified.
Best for
- Mac users wanting official Apple eGPU certification on a mid-tier budget
- RTX 3060/3070-class double-wide card builds on Thunderbolt 3
- Buyers who want Sonnet's build quality without paying for the 750ex's USB hub
Not for
- RTX 3080 Ti/3090 or RTX 40-series cards that want more PSU headroom
- Anyone wanting built-in USB or Ethernet ports on the box itself
- Thunderbolt 4/5 laptop owners who want to make full use of higher bandwidth
FAQs
What are the key specifications of the Sonnet eGFX Breakaway Box 650 (Thunderbolt 3 / 650W PSU / 87W Laptop Charging / Double-Wide GPU / Mac-Certified)?
The Sonnet eGFX Breakaway Box 650 (Thunderbolt 3 / 650W PSU / 87W Laptop Charging / Double-Wide GPU / Mac-Certified) is a eGPU enclosure from Sonnet. Key specs: Connection Standard Thunderbolt 3, PSU Wattage 650, Max GPU Length 310, Host Power Delivery 87, Extra Ports None onboard beyond the GPU's own outputs.
Who is the Sonnet eGFX Breakaway Box 650 (Thunderbolt 3 / 650W PSU / 87W Laptop Charging / Double-Wide GPU / Mac-Certified) best suited to?
It suits mac users wanting official apple egpu certification on a mid-tier budget, rtx 3060/3070-class double-wide card builds on thunderbolt 3, buyers who want sonnet's build quality without paying for the 750ex's usb hub.
What are the drawbacks of the Sonnet eGFX Breakaway Box 650 (Thunderbolt 3 / 650W PSU / 87W Laptop Charging / Double-Wide GPU / Mac-Certified)?
It is a poor fit for rtx 3080 ti/3090 or rtx 40-series cards that want more psu headroom, anyone wanting built-in usb or ethernet ports on the box itself, thunderbolt 4/5 laptop owners who want to make full use of higher bandwidth.
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