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AHCI? Does it make a difference? - Page 3

post #21 of 23
Quote:
Originally Posted by DooRules View Post

I would like to think most of those old Nvidia chipsets have been retired.. Would suck to be stuck at 1.5 link speed.

Indeed.

I've seen quite a few posts in forums about some 2010 - 2011 vintage Mac PCs that use Nvidia SATA chipsets. The old driver used apparently does not recognize SATA III as a valid protocol (which the chipset cannot support anyway) when it reads the SSD's information. The driver's code then downshifts to SATA I speed, and the owners new SATA III SSD they installed is crippled at SATA I speeds. I've seen this at Intel, SanDisk, OCZ, and other forums. Same thing happens on older desktop boards using the Nvidia SATA chipsets and Nvidia driver.

The Mac owners blame the SSD for the problem, and no amount of explanation will satisfy them. Since the SATA chipset, not the SSD, negotiates the link speed, it is not the SSD's fault. OCZ and SanDisk have offered a special firmware update to "fix" this issue, which simply writes "SATA II" as the SSD's speed protocol. Of course, that converts the SSD to a SATA II drive on any SATA interface.
post #22 of 23
I don't really have any plans to do put SSDs on those boards...only one is in use as the media machine in my exercise room and it is running a RAID 0 of some old WD Raptors (for no real good reason other than I had them laying around). Though if an OS HDD dies I would likely replace it with a SSD, but never a RAID 0 of them.

I was really just thinking out loud and asking about it out of curiosity. I've yet to RAID a SSD out side of a NAS that has like 40 of them and relatively poor performance (these appliances tend to serve a few users worse then a normal PC with a file share, but when you have a lot of users they still work just as good.)
Edited by Vagrant Storm - 9/9/13 at 6:32am
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post #23 of 23
AHCI really needs to be replaced for SSDs..... ACHI is designed for HDDs and is limiting SSDs. Samsung is actually pushing a new protocol.
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