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Groups > comp.sys.mac.system > #59841
| From | Lewis <g.kreme@gmail.com.dontsendmecopies> |
|---|---|
| Newsgroups | comp.sys.mac.system |
| Subject | Re: SSD speed on 2009 Mac Book Pro |
| Date | 2014-05-30 04:28 +0000 |
| Organization | Miskatonic U |
| Message-ID | <slrnlog272.ece.g.kreme@amelia.local> (permalink) |
| References | <slrnlodfb6.hq.g.kreme@amelia.local> <1lmf6aj.pclg9h1xpgg2qN%dempson@actrix.gen.nz> |
In message <1lmf6aj.pclg9h1xpgg2qN%dempson@actrix.gen.nz> David Empson <dempson@actrix.gen.nz> wrote: > Lewis <g.kreme@gmail.com.dontsendmecopies> wrote: >> I have an SSD in my 2009 MBP. When I run Black Magic the first write >> test is quite decent, coming in around 170MB/s-225MB/s and the read test >> is around 250MB/s. However, as the test continues to run the write speed >> for the SSD drops dramatically, to the 20-35MB/s range and stays there. >> Read speeds remain high. >> >> This doesn't seem like it should drop like that. >> >> The "Stress level" is set to 1GB and the machine has 8GB of RAM. >> >> There's over 40GB of free space on the SSD. >> >> So... ideas? > I'd guess the SSD has a RAM-based write buffer, and writes to flash > memory in the background. Once you saturate the buffer you are limited > by the actual write speed of the flash memory in the SSD. > What brand/model is the SSD? There might be reviews online (e.g. > anandtech.com) which show expected performance and address this sort of > issue. Capacity: 240.06 GB (240,057,409,536 bytes) Model: Crucial_CT240M500SSD1 Revision: MU03 The M500s are generally rated quite decently, if not at the top tiers. -- "You've got to dance like nobody's watching." - Kathy Mattea
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SSD speed on 2009 Mac Book Pro Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-05-29 04:53 +0000
Re: SSD speed on 2009 Mac Book Pro dempson@actrix.gen.nz (David Empson) - 2014-05-29 18:16 +1200
Re: SSD speed on 2009 Mac Book Pro dempson@actrix.gen.nz (David Empson) - 2014-05-29 18:22 +1200
Re: SSD speed on 2009 Mac Book Pro Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-05-30 04:28 +0000
Re: SSD speed on 2009 Mac Book Pro billy@MIX.COM - 2014-05-30 22:52 +0000
Re: SSD speed on 2009 Mac Book Pro Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-05-29 13:12 -0400
Re: SSD speed on 2009 Mac Book Pro JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-05-29 16:00 -0400
Re: SSD speed on 2009 Mac Book Pro Jolly Roger <jollyroger@pobox.com> - 2014-05-29 20:14 +0000
Re: SSD speed on 2009 Mac Book Pro Your Name <YourName@YourISP.com> - 2014-05-30 09:03 +1200
Re: SSD speed on 2009 Mac Book Pro Jolly Roger <jollyroger@pobox.com> - 2014-05-29 21:24 +0000
Re: SSD speed on 2009 Mac Book Pro billy@MIX.COM - 2014-05-30 22:40 +0000
Re: SSD speed on 2009 Mac Book Pro Jolly Roger <jollyroger@pobox.com> - 2014-05-30 22:49 +0000
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