SSD Problems Yosamite

Unknown96

macrumors newbie
Original poster
Mar 30, 2015
15
0
Hey guys today i changed to SSD On my iMac with a 240gb kingston, i puted it in a usb 3.0 enclosure and clean installed Yosemite 10.10, when i booted it was faster then on HDD, and apps performance was great except the read and write in benchmarks got me worried, i tried using trim enabler to enable trim same thing nothing changed. So any ideas how to get my read write faster? On hdd it was 110mb/s read and write 118mb/s on SSD it dropped to 40mb/s read and write. Any suggestions would be nice. Thank you :)
 

yjchua95

macrumors 604
Apr 23, 2011
6,725
230
GVA, KUL, MEL (current), ZQN
Hey guys today i changed to SSD On my iMac with a 240gb kingston, i puted it in a usb 3.0 enclosure and clean installed Yosemite 10.10, when i booted it was faster then on HDD, and apps performance was great except the read and write in benchmarks got me worried, i tried using trim enabler to enable trim same thing nothing changed. So any ideas how to get my read write faster? On hdd it was 110mb/s read and write 118mb/s on SSD it dropped to 40mb/s read and write. Any suggestions would be nice. Thank you :)
You bought a Kingston, such results are normal. Kingston makes cheap SSDs that use cheap NAND which perform poorly.

http://www.anandtech.com/show/7763/an-update-to-kingston-ssdnow-v300-a-switch-to-slower-micron-nand
 

Unknown96

macrumors newbie
Original poster
Mar 30, 2015
15
0
i got the SSD in my laptop and working pretty fast, what can i do to speed things up on my iMac?
 

throAU

macrumors 603
Feb 13, 2012
5,284
2,276
Perth, Western Australia
Hey guys today i changed to SSD On my iMac with a 240gb kingston, i puted it in a usb 3.0 enclosure and clean installed Yosemite 10.10, when i booted it was faster then on HDD, and apps performance was great except the read and write in benchmarks got me worried, i tried using trim enabler to enable trim same thing nothing changed. So any ideas how to get my read write faster? On hdd it was 110mb/s read and write 118mb/s on SSD it dropped to 40mb/s read and write. Any suggestions would be nice. Thank you :)
If your SSD is still connected via USB, then the 40 megabyte/sec read/write speeds are due to the limitations of the USB 2 bus.
 

joe-h2o

macrumors 6502a
Jun 24, 2012
998
443
You can't enable TRIM on the USB3 bus - it's for internal (or thunderbolt) busses only.

My suggestion would be that your system is bottlenecked - likely because the USB bus is not designed for continuous high bandwidth data transfer when the system is under load.
 

Unknown96

macrumors newbie
Original poster
Mar 30, 2015
15
0
yes my ports supports 3.0 USB and in my country they don't sell thunderbolt enclosures or i would have bought one, do you guys know any cheap thunderbolt enclosures that i can see and buy ?
 

Unknown96

macrumors newbie
Original poster
Mar 30, 2015
15
0
That's okey i will order one from Australia Thanks anyways :) i will make it as solved this thread