What is yk51x86?

The genuine yk51x86.sys file is a software component of Marvell Yukon Ethernet Controller by Marvell.
This is the driver for the Marvell Yukon Ethernet Controller. The Yukon family of Ethernet controllers offer some of the highest performance, lowest power PCI ethernet solutions for PCs and notebooks. Founded in 1995, the Marvell Technology Group has operations worldwide. Marvell’s expertise in microprocessor architecture and digital signal processing drives multiple platforms including high volume storage solutions, mobile and wireless, and networking products.

Yk51x86 stands for Yukon 5.1 server platform x86

Yk51x86.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if yk51x86.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for yk51x86 drivers in need of updating

Yk51x86.sys file information

The process known as NDIS5.1 Miniport Driver for Marvell Yukon Ethernet Controller or Miniport Driver for Marvell Yukon Ethernet Controller belongs to software Marvell Yukon Ethernet Controller or NDIS5.1 Miniport Driver for Marvell Yukon Ethernet Controller by Marvell (

Description: Yk51x86.sys is not essential for the Windows OS and causes relatively few problems. Yk51x86.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 285,952 bytes (37% of all occurrences), 265,856 bytes, 223,104 bytes, 262,912 bytes or 245,248 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. It is a Microsoft signed file. The service has no detailed description. The file is not a Windows system file. yk51x86.sys appears to be a compressed file. Therefore the technical security rating is 18% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you have any problems with yk51x86.sys, you can uninstall Marvell Miniport Driver from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify yk51x86.sys related errors

Important: Some malware disguises itself as yk51x86.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the yk51x86.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Treiber LAN
  Jürgen Quast  
it is the sys file for the marvell yukon ethernet on my laptop
It is important if your network card is the Marvell Yukon Chipset based Ethernet Controller.
networkcard driver
LAN driver software, only delete if you don't want to be able to get on the internet
net work driver files
  kaung myat  
it's a lan controller
I found this under DFI Mainboard / Network Drivers Marvell LAN Drivers install disk for the Marvell Miniport Driver
  Bill Moor  

Rating chart

Summary: Average user rating of yk51x86.sys: based on 15 votes with 9 user comments. 12 users think yk51x86.sys is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks it's neither essential nor dangerous. 3 users don't grade yk51x86.sys ("not sure about it").

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Best practices for resolving yk51x86 issues

A clean and tidy computer is the key requirement for avoiding problems with yk51x86. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the yk51x86.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

yk51x86.sys [all]