OSFP vs QSFP-DD: Understanding the Key Differences in 400G and 800G Optical Transceivers

In recent years, data traffic has surged due to AI workloads, cloud computing, and 5G deployments. As a result, data centers are rapidly transitioning from 100G to 400G and even 800G infrastructure.
Two high-speed optical module form factors—OSFP and QSFP-DD—have emerged to meet these growing demands.

What is OSFP?

• l Full name: Octal Small Form Factor Pluggable

• l Supports 400G, 800G

• l Designed for high power consumption (up to 15W or more)

• l Larger form factor for enhanced heat dissipation

What is QSFP-DD?

• l Full name: Quad Small Form Factor Pluggable - Double Density

• l Supports 400G and now 800G (QSFP-DD800)

• l Backward compatible with QSFP28 / QSFP+

• l Compact size with high port density

• l Ideal for gradual infrastructure upgrades

OSFP vs QSFP-DD: Key Technical Comparison

Use Cases and Application Scenarios

OSFP is ideal for high-power applications, such as AI clusters, hyperscale cloud infrastructure, and next-gen 800G deployments.

QSFP-DD fits well in high-density environments that require backward compatibility, such as telecom networks, enterprise-grade data centers, and edge computing. Future Trends: Toward 800G and Beyond

The industry is rapidly moving toward 800G and even 1.6T. OSFP’s thermal and power advantages position it well for future scalability. Meanwhile, QSFP-DD is evolving into QSFP-DD800, maintaining its compact advantage. Choosing the right form factor depends on your network architecture and long-term goals.

ESOPTIC’s High-Performance OSFP & QSFP-DD Transceivers

At ESOPTIC, we offer a complete lineup of 400G and 800G transceivers based on both OSFP and QSFP-DD standards：

• 400G OSFP SR4 / DR4 / FR4

• 400G QSFP-DD SR4 / SR8 / DR4 / FR4

• 800G OSFP SR8 / DR8 / 2*FR4 

• 800G QSFP-DD SR8 / DR8

All our modules are rigorously tested for interoperability, thermal performance, and signal integrity. They are compatible with major switch brands, including Cisco, Arista, Juniper, and more.

Conclusion: Making the Right Choice

Whether you need high-density compatibility or superior thermal performance, understanding the trade-offs between OSFP and QSFP-DD is key.

ESOPTIC is here to help with professional support, fast delivery, and reliable high-speed optical modules tailored to your needs.

 Looking for expert advice on OSFP and QSFP-DD deployment? Contact our team today.