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Best COMPATIBLE ssd for NVidia MCP79 chipset?

I'm having a **** of a time searching for an answer.

I recently purchased a Toshiba Q Series SATA3 SSD, only to discover my MBP will negotiate it at 1.5 Gigabits only. That's when my crusade began.

I've read that SATA3 is backwards compatible with SATA2. I've proven that false, at least with mine.

I've read that some SATA3 SSDs will indeed work with MCP79, but I've only found hearsay, not real people who have done it and guarantee it.

I've been looking at SATA2 SSDs, but the ones I've seen benchmark well below 3 Gigabits... so what's the point?

Try Crucial M500 SSDs and possibly Samsung 840 Pro SSDs.

I tried to upgrade a friend's late-2008 MBP with an Intel 520 Series SSD and it would not boot into OS X Mavericks when installed in the MBP. The drive could be seen and maintained when I booted from an external drive. Also, when I could see the drive, it showed the same Linked Speed and Negotiated Link Speed as you're seeing with your Toshiba SSD.

I had a new Crucial M500 SSD that I tried and it worked great showing 3Gbps Linked and Negotiated. And it was bootable when installed in the MBP. So, I used that one.

Bottom line, as you've noticed, some brand SSDs don't play nice with the nVidia chipset.

To be clear, SATA 3 is 6gbps, SATA 2 is 3gbps, and SATA 1 is 1.5gbps. It sounds like you have SATA 1. You don't say which specific MBP you have, so we aren't going to be able to verify that. Often the drive will negotiate downwards, but the SATA cable is marginal and the increased demand of an SSD shows up as a failure, so it could be your SATA cable that's the issue.

The way to think about drive speed is Bottleneck Analysis. As long as the connection methods are faster than the Drives, there will be no appreciable slowdown.

All single rotating and SSD drives available today and most Arrays are MUCH slower than SATA-2, PCIe, or ThunderBolt, so there will be no real-world slowdown.

"A chain is only as strong as its WEAKEST Link", and a drive is only as fast as its SLOWEST connection. In this case, that is the speed at which the data spins under the read heads, or the access time of an SSD. At this writing, these are all quite a bit slower than the Busses available. So there will be no real-world difference in where you attach those drives.

RE: SATA Bus speed:

SATA 3 is rated at 6G bits/sec, which theoretically is about 750 Mega Bytes/sec

SATA 2 is rated at 3G bits/sec, which is theoretically about 375 Mega Bytes/sec

SATA 1 is rated at 1.5G bits/sec, which is theoretically about 187.5 Meg Bytes/sec

Rotating drives available today, whatever their SATA spec, can source data off the spinning platters no faster than about 125MBytes/sec.

None of the SATA Busses is a bottleneck for consumer Rotating drives you can buy today. Trying to speed up the SATA Bus will not provide any real-world performance increases for Rotating Drives.

Even MOST common SSD drives are not bottlenecked by SATA 2.

>> If you have a faster SSD Data drive, consider mounting it on a PCIe card that features SATA-3 slots, but it may not be bootable from there.

There are no superfast PCIe-direct devices available today (except inside Apple computers), but rumors suggest we may see some in 2014.

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I have an OWC Mercury Electra 3G SSD installed in a 2009 PowerBook.  It has a link speed of 3 Gbps and a negotiated link speed of 3 GBps. I purchased it from OWC (macsales.com) because very often in this forum people praise OWC and Crucial.com for their Mac-compatible parts and service.

Try Crucial M500 SSDs and possibly Samsung 840 Pro SSDs.

I tried to upgrade a friend's late-2008 MBP with an Intel 520 Series SSD and it would not boot into OS X Mavericks when installed in the MBP. The drive could be seen and maintained when I booted from an external drive. Also, when I could see the drive, it showed the same Linked Speed and Negotiated Link Speed as you're seeing with your Toshiba SSD.

I had a new Crucial M500 SSD that I tried and it worked great showing 3Gbps Linked and Negotiated. And it was bootable when installed in the MBP. So, I used that one.

Bottom line, as you've noticed, some brand SSDs don't play nice with the nVidia chipset.

The Crucial M500 works great. Thanks!

Fantastic!  My pleasure.

I decided to upgrade my 2009 Macbook with Nvidia MCP79 chipset last month.  The first drive I tried was the SanDisk Extreme II.  That one was incompatible so I returned it and bought the Crucial M500.  I've sinces spent the last 3 weeks trying to make it work properly.  Right out of the box I had trouble cloning my original Apple 128GB SSD while connected to my laptop.  Using a couple different external USB/SATA adapters to clone the drive proved to be impossible with the Macbook.  So, I tried a clean install of OS X to the M500.  It would not take the install if I was using my Macbook to do it.  This was true whether the drive was internal or external at the time of install.  I even tried using my original Leapord disk that came with the system and even that would not sucessfully install on the M500. 

I eventually got an OS installed on it by using a different computer and external enclosure.  After placing that inside my Macbook everything seemed fine.  After 3 days the computer began to lag and drive errors starting popping up. Verifying/repairing permissions in disk utility failed with "open error 5" reports for multiple items.  Attempting a disk verify/repair also failed.  Booting with a system on a USB flash drive and using disk utility on the M500 also failed.  By removing the drive and reconnecting it to a different computer I was able to repair it file structure on the drive.  However, after a few hours the same problems returned. 

Crucial advised that I update the firmware on the SSD.  I did that and started with a fresh install on the drive after doing a secure 3 pass erase.  Again I had to install the OS on a seperate system and then install the drive in the Macbook.  Again after 3 days the system became unstable. 

I've returned the drive as defective.  However, the problems seemed to be related to using it in the Macbook.  I could install the OS using a newer iMac, but not the 2009 Macbook 5,3 with Nvidia MCP79 chipset.  I put the original drive back in with a fresh OS install and everything is working flawlessly exactly as it was before I tried using the M500.

It could be that the drive I had was defective.  It appeared to work fine for several days then slowly became unusable to the point that it couldn't even boot anymore.  Yet, taking it out and connecting it to a different computer seemed to restore it to working condition again for a few days.  I'm curious to know if the other people reporting the M500 as compatible with the Nvidia MCP79 chipset had problems days to weeks after installing the M500.

My M500 continues to work great after 6 weeks. I purchased it from Newegg. If it hadn't worked, I would have given up.

Thanks, I suppose I just had a dud. 

There are two difficulties that could be contributing to your difficulty.

Some of the recent MacBook Pro models are seeing a rash of Internal Hard Drive cable problems. These show themselves not as outright failures, but as flaky unreliable operation. At faster transfer speeds, such as using an SSD, they are worse. Since booting from a drive is much more intensive than simply reading files off a drive, these sometimes install OK, and sometimes even seem to be OK when checked with Target disk Mode from another Mac.

Anecdotally, the worst of these seem to be the 2009 models. But others are not trouble-free.

-----

The other issue has to do with an SSD's inability to unload deleted data. The OS never tells a Non-Apple SSD what data are being deleted, so the SSD must continue to track, move, and re-organize data that are no longer needed. This can cause an SSD to slow down and even become dysfunctional while Mac OS X says there are still lots of blocks it calls "Free". This article explains the back story:

https://en.wikipedia.org/wiki/TRIM

TRIM Enabler by groths has been widely used to get better results from non-Apple SSDs. Apple has not provided a mechanism that allows more elegant support of TRIM on third-party SSD drives.

So this (and others like it) requires setting aside an Apple module and replacing it with a patched version. Apple has not chosen to allow drive Vendors to qualify their drives, and has not left the names of qualified drives in a config file where they could be modified without changing the code itself.

The symptoms you list for non-apple SSD TRIM support do sound like the problems I experienced.  Except, I did have TRIM turned on with the Crucial M500.  That was the first thing I did after I got it up and running in the Macbook.

The bad cable symptoms also match mine, but I was exchanging an SSD for a larger SSD and the speed difference was probably not critical.  Also, I had issues with the Crucial M500 even when attached to the MBP through an external USB enclosure. 

Other people have had similar problems with Crucial drives that require doing regular power cycles to restore functionality.  A power cycle involves removing the drive and attaching it to a power source without connecting it to the drive controller.  After letting it idle in that state for 20 minutes the drive is powered down for another 30.  This cycle is repeated a few times and then the drive will be good to go again.  However, this solution is temporary and I've found reports from several Crucial SSD users stating that the power cycle fix becomes a weekly, or even daily, routine to maintain drive functianality.  This seems to be a production defect of some Crucial drives.  I returned mine as soon as it became clear it could not maintain integrity for more than a few days at a time without being removed from the MBP. 

After letting it idle in that state for 20 minutes the drive is powered down...  This cycle is repeated a few times and then the drive will be good to go again. 

That cycle applies Power, but no activity -- the exact conditions needed for the drive to perform a major Garbage Collection cycle (or several). After completing some of those, the drive is more likely to have several free SuperBlocks available, and having free SuperBlocks means it can Write at full speed again.

A drive would be much more likely to get into that state without the use of TRIM. It may also be an indication that the drive's firmware is a bit primitive. The number of drive firmware update being issued suggests that brand has firmware that is less mature than other manufacturer's drives.

I told you I was using TRIM.  That's not the issue.  Also, TRIM can be enabled without the use of third party software.  You are overstating the effect of TRIM as a properly functioning drive will operate fine with or without TRIM enabled.  The original APPLE SSD that is in the MBP now does not use TRIM and I used that for 4 years without a problem.

Crucial just issued a firmware upgrade for the M500 to version MU5 in March 2014.  Even with that upgrade I still had problems.  However, the M500 has been been used successfully even with the previous firmware, as Invisible E has reported.

As I see it I was using a drive under indentical conditions in an identical system using the identical drive that other users have used without problem.  I know my system is fine and I performed a clean install of the OS after a secure 3 pass full erase.  So, all else being equal it has to be a drive failure.

Finally, the many users who also report the same problems with their M4 & M500 drives indicates a sporadic defect specific to Crucial drives.   I've not heard of anyone actually fixing one of these defective drives and I'm certainly not going to start dissambling my MBP every few days to run a power cycle on my SSD.  That's not what I consider a functioning drive.  I think Crucial just let some defective drives get past quality control.

最后更新：2017-09-19 11:35:06

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