---
product_id: 13667130
title: "T520-SO-CR 2-Port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ Connector"
brand: "chelsio communications"
price: "977 zł"
currency: PLN
in_stock: true
reviews_count: 3
category: "Chelsio Communications"
url: https://www.desertcart.pl/products/13667130-t520-so-cr-2-port-low-profile-1-10gbe-server
store_origin: PL
region: Poland
---

# 10Gbps blazing speed PCI-E x8 Gen 3 interface Dual SFP+ ports T520-SO-CR 2-Port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ Connector

**Brand:** chelsio communications
**Price:** 977 zł
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your server game with 10GbE power and future-ready offload tech!

## Quick Answers

- **What is this?** T520-SO-CR 2-Port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ Connector by chelsio communications
- **How much does it cost?** 977 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/13667130-t520-so-cr-2-port-low-profile-1-10gbe-server)

## Best For

- chelsio communications enthusiasts

## Why This Product

- Trusted chelsio communications brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual SFP+ Connectivity:** Flexible dual-port SFP+ connectors enable versatile, high-speed fiber or DAC cable connections.
- • **Unified Protocol Offload:** Run TCP, RDMA, iSCSI, FCoE, NVMe-oF and more simultaneously to streamline your data center fabric.
- • **Blazing 10GbE Performance:** Experience ultra-fast 10 Gigabit Ethernet speeds for seamless data flow and reduced latency.
- • **Next-Gen PCI-E x8 Gen 3 Interface:** Maximize throughput with cutting-edge PCI-E Gen 3 connectivity designed for high-demand server environments.
- • **Optimized for Virtualization & HPC:** Engineered to boost cloud, storage, and virtualization workloads with advanced offload capabilities.

## Overview

The Chelsio T520-SO-CR is a dual-port low profile 1/10GbE server offload adapter featuring PCI-E x8 Gen 3 and SFP+ connectors. It supports advanced protocol offloads including TCP, RDMA, iSCSI, and NVMe-oF, making it ideal for high-performance storage, cloud, and virtualization environments. Designed for professional-grade data centers, it delivers blazing 10Gbps speeds with versatile connectivity and robust driver support for modern OS versions.

## Description

2-port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, Server Offload. SFP+ connector.

Review: FreeNAS server - it just works - I used this with a DAC cable to connect my FreeNAS server to the network. Install, boot, it just works. Perfect!
Review: Does not work as advertised - Good: Has a good reputation for performance, working well with FreeBSD right out of the box. Bad: In my case, at least, that reputation is unfounded. Docs state specifically that this card works with FreeBSD 10.3-STABLE, which is what my FreeNAS installation is running on. Installed the card, booted up, system recognized the card but driver refused to load. Several hours of research and tweaking were fruitless. Contacted Chelsio tech support. They responded promply. After e-mail exchange, they told me that recent firmware mods no longer support FreeBSD 10, the minimum is now ver. 12.0. Upgrading is not an option for me; FreeNAS will not support 12.0 until later this year. Chelsio supplied a set of patches they claimed would allow use on 10.3. I was and am dubious about rebuilding a critical driver with a set of patches which cannot have been thoroughly tested, but after considerable effort I managed to compile from source with patches applied. Patched driver still refused to load. Gave up, returned the card, and bought an older model Chelsio card on eBay known to work with my version of FreeBSD/FreeNAS. Bottom line: It's possible that I could have made this card work, eventually. The bottom line, however, is that I shouldn't have to. Chelsio made changes to their card that broke an allegedly supported release, and didn't backport their 10.3 driver to match. I need this 10Gb segment online, and I'm uncomfortable with tinkering with a critical driver that is claimed to, and should, work right out of the box. I have just enough faith left in Chelsio to try their S320E card, even if I take a bit of a performance hit. If that doesn't work out, I guess I'll buy an Intel card like I probably should have done in the first place. Two stars, mainly because Chelsio support was fast and professional.

## Features

- 10GbE Unified Wire Adapters for Offloaded TCP, RDMA(iWARP), iSCSI, FCoE, DPDK, NVMe-oF, OvS Offload, Packet Classification & Filtering, Virtualization and more
- The Terminator series of Adapters enable a unified fabric over a single wire by simultaneously running all Protocols Concurrently
- Optimized for storage, cloud computing, HPC, virtualization and other datacenter networking applications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00FAU898K |
| Best Sellers Rank | #872 in Internal Computer Networking Cards |
| Brand | Chelsio Communications |
| Built-In Media | Dual Port 10GbE Adapter with low profile mounting bracket, Full Height mounting Bracket, Quick Installation Guide |
| Compatible Devices | Desktop |
| Customer Reviews | 4.4 out of 5 stars 10 Reviews |
| Data Transfer Rate | 10240 Megabits Per Second |
| Global Trade Identification Number | 00897709002738 |
| Hardware Interface | Ethernet |
| Item Type Name | CHELSIO COMMUNICATIONS T520-SO-CR 2-port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ connector |
| Item Weight | 0.38 Pounds |
| Manufacturer | Chelsio Communications, Inc |
| UPC | 897709002738 |
| Warranty Description | 1 Year Warranty |

## Product Details

- **Brand:** Chelsio Communications
- **Compatible Devices:** Desktop
- **Data Transfer Rate:** 10240 Megabits Per Second
- **Global Trade Identification Number:** 00897709002738
- **Hardware Interface:** Ethernet
- **Item Weight:** 0.38 Pounds
- **Manufacturer:** Chelsio Communications, Inc
- **UPC:** 897709002738

## Images

![T520-SO-CR 2-Port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ Connector - Image 1](https://m.media-amazon.com/images/I/61xzRHH9SML.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ FreeNAS server - it just works
*by R***B on April 2, 2020*

I used this with a DAC cable to connect my FreeNAS server to the network. Install, boot, it just works. Perfect!

### ⭐⭐ Does not work as advertised
*by R***. on July 1, 2020*

Good: Has a good reputation for performance, working well with FreeBSD right out of the box. Bad: In my case, at least, that reputation is unfounded. Docs state specifically that this card works with FreeBSD 10.3-STABLE, which is what my FreeNAS installation is running on. Installed the card, booted up, system recognized the card but driver refused to load. Several hours of research and tweaking were fruitless. Contacted Chelsio tech support. They responded promply. After e-mail exchange, they told me that recent firmware mods no longer support FreeBSD 10, the minimum is now ver. 12.0. Upgrading is not an option for me; FreeNAS will not support 12.0 until later this year. Chelsio supplied a set of patches they claimed would allow use on 10.3. I was and am dubious about rebuilding a critical driver with a set of patches which cannot have been thoroughly tested, but after considerable effort I managed to compile from source with patches applied. Patched driver still refused to load. Gave up, returned the card, and bought an older model Chelsio card on eBay known to work with my version of FreeBSD/FreeNAS. Bottom line: It's possible that I could have made this card work, eventually. The bottom line, however, is that I shouldn't have to. Chelsio made changes to their card that broke an allegedly supported release, and didn't backport their 10.3 driver to match. I need this 10Gb segment online, and I'm uncomfortable with tinkering with a critical driver that is claimed to, and should, work right out of the box. I have just enough faith left in Chelsio to try their S320E card, even if I take a bit of a performance hit. If that doesn't work out, I guess I'll buy an Intel card like I probably should have done in the first place. Two stars, mainly because Chelsio support was fast and professional.

### ⭐⭐⭐⭐⭐ The best 10G card for Linux systems
*by D***D on June 17, 2020*

Would buy it again , package came in a very good condition this time .

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-02-06*