SSD performance under bootcamp crippled? Read only 300MB/sec

[Philflow]

I've got a Vertex 3 120GB in my MBP 2011 13". Read speed (with 0 fill data) under bootcamp is only 300 MB/sec while it should be getting 550 MB/sec.

In every benchmark (CDM, ATTO, AS-SSD) sequential read is <300 MB/sec.

Does anyone know why?

Is anyone getting better SSD performance in bootcamp?

Edit: I think I found the answer: IDE vs. AHCI: http://www.ocztechnologyforum.com/f...ing-AHCI-for-Windows-on-MBP-2011-now-possible

 

[wikus]

If youre on a 2010 Macbook Pro, youre using SATA which is limited to 3Gbit speeds, although that should still be 375Mbp/s (3000mb/8=375mb).

 

[Philflow]

It's a MBP 2011 with SATA 6Gbps support. I'm getting full speed in OS X.

Edit: I think I found the answer: IDE vs. AHCI: http://www.ocztechnologyforum.com/f...ing-AHCI-for-Windows-on-MBP-2011-now-possible

 

[Timur]

By default Bootcamp only uses IDE drivers instead of AHCI. You need to do a hack that changes the value of a sector on the MBR. Once done you cannot put the MBP to sleep on Bootcamp anymore.

http://www.ocztechnologyforum.com/f...ing-AHCI-for-Windows-on-MBP-2011-now-possible

Furthermore it depends on which AHCI driver you are using (Intel vs. MSAHCI) and then it depends on whether Link Power Management (LPM) is active or not (Registry hack for Intel drivers, "High Performance" power-profile for MSAHCI to turn it off).

Last but not least CPU power-saving features have a considerable impact, both on real performance and on the measurements. Run something like Prime95 and try the benchmark again, results will change.