Having put an SSD in my MacBook (7,1 Model) In System Information under Serial-ATA as follows;
Link Speed: 3 Gigabit
Negotiated Link Speed: 1.5 Gigabit.
Why is this? The Negotiated Link Speed should be 3 Gigabit. The SSD is SATA-III and capable of 6GB/s, I appreciated that the SATA controller (NVidia MCP89) doesn't support SATA-III and 6GB/s but 3GB/s would be nice. I have reset the SMC. Any Ideas?
MacBook, Mac OS X (10.7.4)
I might have a solution. Which SSD are you using?
It's an OCZ Agility 3 120GB.
That was my guess!
I have the same problem. There is a fix for this problem from by the manufacturer:
"Some SATAII motherboards, when used with one of the above drives will downgrade the drive to SATA1 speeds. We find this mostly on Nvidia chipset motherboards for PC and Nvidia chipset based Mac's.
To resolve this, we have a tool that will set the link speed to be locked at SATAII and improve performance. This can be reversed when you update your motherboard/system so you can have the full SATAIII speed again."
Details can be found here:
Please let me know if this works for you. Will try to apply the fix this weekend, too.
Success!
Now getting SATA-II speeds 3GB/s. (Not that I can really tell the difference)
Just make sure you download the tools for mac and burn the ISO to a disc then boot to the disc. Quite a nice set of tools some other features on there too which are worth a look.
Many thanks for your help.
If anyone has an OCZ SSD this fixed mine.
https://discussions.apple.com/thread/4046514?answerId=18725282022#18725282022
Hi, I don't know if anyone here can help me with this question or have personal experience with it. So here it goes:
Does the OCZ's tools for locking the SSD to SATA II work with other SSDs that's also using the SandForce SF2281 controller?
Has anyone tried this fix on a intel SSD 520? OCZ vertex3, agility3 and Intel SSD 520 are using SandForce SF-2281 controller.
MacBook SSD - Negotiated Link Speed: 1.5 Gigabit?
