Goron Posted December 23, 2011 Share Posted December 23, 2011 So, my OCZ Vertex 3 seems not to run properly: it is specified for 550MB/s read AND write speed. As i´m quiete aware, that these are theoretical speeds and in every day use about ±80% should be realistic, i´m very sattiesfied with my read speed, but what the heck is wrong with writing? Anyone any suggentions? Goron Link to comment Share on other sites More sharing options...
al6042 Posted December 23, 2011 Share Posted December 23, 2011 I have the same problem on my Original MacBookPro 13" (late 2009). I'm using the OCZ Agility 3 (SATA-3) on my SATA-2 connector and getting around 100 MB/s write and 125 MB/s read, while the theoretical speed should be around 250 MB/s... Link to comment Share on other sites More sharing options...
Goron Posted December 23, 2011 Author Share Posted December 23, 2011 Well, if it was like that ... Your Speeds are quiete close together, while the gap between read and write is stunnigly wide Which App did you use for benchmarking? Link to comment Share on other sites More sharing options...
al6042 Posted December 23, 2011 Share Posted December 23, 2011 Blackmagic Disk Speed Test, genau wie du... The issue is that my SSD should a better throughput than my mentioned 100 MB/s (125 MB/s): Excerpt from http://www.mactrast.com/2011/09/mactrast-reviews-ocz-vertex-3-ssd/ : Make no mistake about it – installing an SSD in your Mac will provide a serious boost in performance, which makes sense considering that a traditional 7200RPM hard drive can operate at a max of around 105MB/Sec, whereas a SATA 2 SSD can operate at up to around 300MB/Sec, and the fastest SATA 3 SSD’s can operate at 550GB/s, nearly maxing out the 600GB/s maximum speed of SATA 3. I also just tried the Aja System Test app... There you have the ability to check/uncheck the file system cache... See the attached results: BTW: Are you using the TRIM Enabler for your SSD? AJA-OCZAgility3-enableCache.tiff AJA-OCZAgility3-disableCache.tiff Link to comment Share on other sites More sharing options...
Goron Posted December 23, 2011 Author Share Posted December 23, 2011 Yap, as shown in Screenshot, TRIM IS enabled Think i found it: Blackmagic just shows wrong values on some SandForce Controllers! Some new SSD´s (like Agility 3) use compression when writing to disk, so it assumes ALL SandForce Controllers do use that feature. Blackmagic tries to "compense" the file compression somehow ... this "feature" is massively criticized in AppStore comments, also ... Just tried to copy 2 GB file (1,93GB) from RAMdisk to SSD -> 8 seconds -> everything seems to be just fine Goron Link to comment Share on other sites More sharing options...
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