---
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: "94182 Ft"
currency: HUF
in_stock: true
reviews_count: 3
category: "Chelsio Communications"
url: https://www.desertcart.hu/products/13667130-t520-so-cr-2-port-low-profile-1-10gbe-server
store_origin: HU
region: Hungary
---

# 10GbE ultra-fast throughput PCI-E x8 Gen 3 interface Dual SFP+ ports for versatile connectivity T520-SO-CR 2-Port Low Profile 1/10GbE Server Offload Adapter with PCI-E x8 Gen 3, SFP+ Connector

**Brand:** chelsio communications
**Price:** 94182 Ft
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your network game with the T520-SO-CR — where speed meets smart offload!

## 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?** 94182 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/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

- • **Blazing 10GbE Speeds:** Experience lightning-fast 10 Gigabit Ethernet for seamless data flow and zero lag.
- • **Dual-Port Versatility:** Two SFP+ connectors enable flexible, high-speed network configurations tailored to your needs.
- • **Next-Gen PCI-E x8 Gen 3:** Harness the power of PCI-E Gen 3 for maximum bandwidth and future-proof performance.
- • **Unified Protocol Offload:** Offload TCP, RDMA, iSCSI, FCoE, and more simultaneously to supercharge your server efficiency.
- • **Optimized for Modern Data Centers:** Designed for cloud, HPC, virtualization, and storage workloads—stay ahead in the digital race.

## 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 offload protocols like TCP, RDMA, iSCSI, and FCoE, making it ideal for high-performance storage, cloud, and virtualization environments. With a 10Gbps data transfer rate and robust multi-protocol support, it delivers efficient, scalable networking for demanding data center applications.

## 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 | #1,006 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 Hungary*
*Store origin: HU*
*Last updated: 2026-02-14*