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MortenBS Author

Level 1

0 points

Macmini3,1 samsung 840 evo ssd 3 Gigabit 1,5 Gigabit

I have installed a Samsung SSD HDD 840 EVO 1TB and now the Mac mini slows down on the sata bus.

My system is a Mac Mini 3.1 (late 2009)

OSC = Maverick 10.9.2 (13C64)

NVidia MCP79 AHCI:

Producent: NVidia

Produkt: MCP79 AHCI

Koblingshastighed: 3 Gigabit

Forhandlet koblingshastighed: 1,5 Gigabit

Fysisk forbindelsestype: SATA

Beskrivelse: AHCI Version 1.20 Supported

Samsung SSD 840 EVO 1TB:

Kapacitet: 1 TB (1.000.204.886.016 byte)

Model: Samsung SSD 840 EVO 1TB

Revision: EXT0BB0Q

Serienummer: S1D9NEADA01207J

NCQ (Native Command Queuing): Ja

Antal kommandoer i kø: 32

Udskiftelige medier: Nej

Udskifteligt drev: Nej

BSD-navn: disk0

Medium type: Fast hukommelse

TRIM-understøttelse: Ja

Navn på rum: Lower

Type partitionsoversigt: GPT (GUID-partitionstabel)

S.M.A.R.T.-status: Kontrolleret

I have googles the issue and can see the same issue are on other SSD HDDs and it may be related to the NVidia MCP79. Has anybody a solution on this issue..?

Best Regards

Morten

Mac mini, OS X Mavericks (10.9.2)

Posted on Mar 22, 2014 4:07 AM

37 replies

lllaass

Level 10

210,417 points

Mar 24, 2014 1:20 PM in response to MortenBS

I have an OCZ Agility 3 SSD in my late 20o9 Mini and only get 1 .5 GB negotiated speed too.

BDAqua

Level 10

239,351 points

Mar 24, 2014 4:25 PM in response to MortenBS

One passing thought, might it be due to how much power is available, like how many other thing are connected at bootup?

Lanny

Level 6

13,183 points

Mar 24, 2014 5:12 PM in response to MortenBS

Just adding info, I don't have a SSD, I'm using one of Seagate's Hybrid drives, in a MacMini 3.1, but the connection stays at 3 Gigs.

Hardware Overview:

Model Name: Mac mini

Model Identifier: Macmini3,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2.66 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache: 3 MB

Memory: 8 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MM31.00AD.B00

SMC Version (system): 1.35f1

NVidia MCP79 AHCI:

Vendor: NVidia

Product: MCP79 AHCI

Link Speed: 3 Gigabit

Negotiated Link Speed: 3 Gigabit

Physical Interconnect: SATA

Description: AHCI Version 1.20 Supported

ST750LX003-1AC154:

Capacity: 750.16 GB (750,156,374,016 bytes)

Model: ST750LX003-1AC154

Revision: SM12

Serial Number: W200NATL

Native Command Queuing: Yes

Queue Depth: 32

Removable Media: No

Detachable Drive: No

BSD Name: disk0

Rotational Rate: 7200

Medium Type: Rotational

Bay Name: Lower

Partition Map Type: GPT (GUID Partition Table)

S.M.A.R.T. status: Verified

lllaass

Level 10

210,417 points

Mar 25, 2014 3:36 AM in response to BDAqua

I just disconnected my FW iSight camera and rebooted and now both the SSD and internal HD say negotiated speed is 3 Gb

later 2009 Mini

BDAqua wrote:

One passing thought, might it be due to how much power is available, like how many other thing are connected at bootup?

MortenBS Author

Level 1

0 points

Mar 25, 2014 3:45 AM in response to lllaass

Hi ..

Besides the 24" Apple Screen, I have an Eye TV USB only connected. This has been working together with the Old HDD and the standard rotating HDD uses more power compaired to the SSD HHD.

I did unmont the Eyetv USB dongle and sorry to say this again..

Still 1.5Gbit

Morten

BDAqua

Level 10

239,351 points

Mar 25, 2014 10:15 AM in response to lllaass

Can you now reconnect the iSight after bootup & mauntain the 3 Gb/s speeds?

BDAqua

Level 10

239,351 points

Mar 25, 2014 10:18 AM in response to MortenBS

Since the speed is an intermittent thing, the only variable things I can think of are power & timing during negotiation.

lllaass

Level 10

210,417 points

Mar 25, 2014 10:30 AM in response to BDAqua

I reconnected iSight, turned it on then rebooted and still at 3 Gb

BDAqua

Level 10

239,351 points

Mar 25, 2014 10:57 AM in response to lllaass

Does it work from a full shutdown then power up?

lllaass

Level 10

210,417 points

Mar 25, 2014 11:19 AM in response to BDAqua

Yes it still shows 3 Gb for the SSD but I lost the internal HD. Does not show at all in System Report. I did both restore and shutdown and button restart..

lllaass

Level 10

210,417 points

Mar 25, 2014 1:45 PM in response to lllaass

Popped the top/bottom off and the cable connection to the HD was backed-off a lottle. Resetted and all is well at 3 Gb

MortenBS Author

Level 1

0 points

Mar 25, 2014 4:10 PM in response to lllaass

Hi IIIaass

with your experience....

I may try to disconnect the DVD drive inside the Mac Mini and boot up again?

Do anybody recommend this try for getting the nagotiating speed up to 3Gbit?

Morten

lllaass

Level 10

210,417 points

Mar 26, 2014 3:29 AM in response to MortenBS

I would try that. It is easy to do that

Mar 27, 2014 2:58 AM in response to MortenBS

I've the same problem with a MacMini 4.1!

I installed some days ago Samsung 840 SSD mSATA 1GB at my MacMini and it's slow

and buggy. I tryed to install a system serveral times and it crashed, makes copy faults.

Bus Speed 1.5GB/s but it feels like 0.15GB/s.

Firmware from the MacMini and the SSD is the newst, as far as I know...

Any idea?

MortenBS Author

Level 1

0 points

Mar 27, 2014 4:16 AM in response to stefan.saur

Hi all,

I have send Samsung an equiry of the problem and below is there answer:

Thank you for your inquiry!

Unfortunately we are not able to help you either. There is something pre-set in some Apple computers, that they just do not negotiate the full link speed with SATA III SSDs. With Windows computers there is always a BIOS update or chipset update to fix this problem, but for Apple computers there is not much you can do, unless Apple provides you with a solution for this.

The SSD is not defective, this is a limitation which comes from the BIOS /FW settings of your computer.

Kind Regards,

Liva Rutka

Customer Support

Hanaro Europe BV

Florijn 8

5751 PC Deurne

The Netherlands

This is Really really , really really bad stuff to hear......

Does anybody know if Apple will fix this issue?

Morten

Macmini3,1 samsung 840 evo ssd 3 Gigabit 1,5 Gigabit