eGPUs do work, but they come with some notable limitations
Razer relaunched its external‑GPU line in July 2025 with the Core X V2, a $350 Thunderbolt 5 dock that routes a desktop graphics card through a PCIe 4.0 x4 link (64 Gbps). The enclosure itself lacks a power supply or peripheral ports, forcing buyers to purchase an ATX PSU and a separate Thunderbolt 5 dock (starting at $390) for USB and Ethernet. Benchmarks show a sizable performance penalty: Notebookcheck’s 2021 RTX 2080 Ti test recorded 7‑32 % slower rendering versus a desktop, while PC Gamer’s recent RTX 4070 Ti and 4090 trials found roughly 25 % loss over Thunderbolt compared with OCuLink, with the faster 4090 gaining even less. The bottleneck stems from Thunderbolt’s 40 Gbps (Thunderbolt 4) or 80 Gbps (Thunderbolt 5) ceiling, an eighth of a PCIe 4.0 x16 slot, meaning high‑end cards cannot fully exploit their silicon when tethered to a laptop.
The move reflects a broader push to keep thin laptops gaming‑capable without the expense of a full‑size PC. Framework’s OCuLink dev kit for its Laptop 16 sidesteps Thunderbolt by exposing an eight‑lane PCIe connection capable of 128 Gbps, but it sacrifices plug‑and‑play convenience and requires a separate power source. Apple’s abandonment of eGPU support on its Silicon Macs further narrows the market, leaving Windows‑based laptops and niche workstations as the primary candidates. Meanwhile, the cost equation—$350 enclosure, $390 dock, plus a high‑end GPU and PSU—often exceeds the price of a modest gaming desktop that avoids the external bandwidth choke entirely.
Looking ahead, the viability of eGPUs hinges on wider adoption of Thunderbolt 5 laptops and cheaper, integrated dock solutions that bundle power and I/O. Developers may also explore software tricks to preload textures and reduce frame‑back‑haul, but the physics of the link remain unchanged. Consumers should watch for future Razer or third‑party models that offer native PCIe x8 or x16 external lanes, and for any macOS updates that might revive eGPU support beyond AI‑only drivers like TinyGPU.
Key Takeaways
Razer’s Core X V2 delivers a Thunderbolt 5‑based eGPU solution but adds $390‑plus for essential I/O and power, inflating total cost beyond a budget gaming PC.
Benchmarks confirm a 7‑32 % performance hit for RTX 2080 Ti and about 25 % loss for RTX 4070 Ti/4090 when run over Thunderbolt, with higher‑end cards suffering proportionally more.
Framework’s OCuLink kit offers up to 128 Gbps PCIe bandwidth, yet its lack of power delivery and plug‑and‑play convenience limits mainstream appeal.
Apple’s continued lack of eGPU support confines external GPU use to Windows laptops, making the market dependent on Thunderbolt 5 laptop proliferation.
About the Source
This analysis is based on reporting by Engadget. Here is a short excerpt for context:
You're probably better off buying a basic gaming PC than messing with an eGPU.Read the original at Engadget
