SSD and MacBook Pro: fast on MAC partition - slow on WINDOWS partition

Hi guys,

I hope I can find someone here with a MacBook Pro (or an Apple computer in general)

I have the Sandisk SSD running really good benchmarks when in Mac Os X,

but with half-speed performance under the Windows partition

(Please note: I use Bootcamp, so it’s like “native” inside a dedicated Windows partion - not virtual machine!)

Someone had the same issue?

It’s the SSD firmware? It’s the Apple driver for Windows sucks? 

Thank in advance…

Michele

What model of MacBook Pro?

What is the SSD model?

Firmware version?

OS X version?

Bootcamp Version?

Hi Summit48 and thanks for your reply…

MacBook Pro 15" Late 2011

SSD: Sandisk Extreme Pro 480GB (Sata III)
Firmware version: X21100RL

OS X Mavericks 10.9.5
Bootcamp version: 5.1
Windows OS version: Micrsoft Windows 7 Professional 64bit (SP1)

600MB/s under OS X Mavericks

300MB/s under Bootcamp

P.S. I read AHCI is disabled by Bootcamp so SATA speed are reduced till you tweak something…?

 I note the firmware on the drive is not the latest. Not saying an update will fix the problem.

New changes since version X21100RL (240GB, 480GB) and X211T0RL (960GB):

  • Improved DEVSLP compatibility.
  • Improved compatibility with certain systems where SATA link sometimes negotiated to SATA 2 vs SATA 3.
  • Added periodic save SMART Attribute to non-volatile memory

Given the above, are you able to confirm if the SSD is running at Sata2 (3 Gbit/s) or Sata3 (6 Gbit/s) when running Win7 via Bootcamp?

HWiNFO64 could be a useful tool in Win7

How much free space do yo have on the Windows partition?

I assume the figures are Seq read?

What did you use to get the numbers?

Hi and thank you again

Yes, the firmware is not the latest, but considering the ssd is running great and at full speed under os x,
I assume this is my last problem…

Despite read/write speeds, using the sandisk tool for windows, the drive appears to be working in sata 3 (6Gbits/s)
(not negotiated sata 2)

190GB free on the windows side

I used ATTO to get the numbers…

I’m pretty sure the drive is not working in ahci though… and this should be the thing

HWiNFO64 should tell you if AHCI is enabled.

Also check Win7 Device Manager.

Trim on the drive is supported, to confirm it is turned on use trimcheck.

Benchmarking tools are not always accurate, so it pays to test witha few different ones.

Crystal Disk Mark64 and AS SSD for benchmarking windows

Blackmagic Speed Test for benchmarking OS X and compare results.

Here the results compared…

Under MAC OS X

Under Windows 7 Professional (Bootcamp)

 TRIM is enabled, the drive is SATA III 6 GB/s, but it’s IDE (NOT AHCI!)

I think your first hunch was correct.

It you google “ACHI win7 bootcamp” there is info out there.

Looks like it can be done if you have a Mac with an Intel Host Controller.

@mikygyver wrote:

Hi guys,

 

I hope I can find someone here with a MacBook Pro (or an Apple computer in general)

 

I have the Sandisk SSD running really good benchmarks when in Mac Os X,

but with half-speed performance under the Windows partition

(Please note: I use Bootcamp, so it’s like “native” inside a dedicated Windows partion - not virtual machine!)

 

Someone had the same issue?

 

It’s the SSD firmware? It’s the Apple driver for Windows sucks? 

 

Thank in advance…

Michele

It you google “ACHI win7 bootcamp” there is info out there.

Looks like it can be done if you have a Mac with an Intel Host Controller.