Slow OWC Mercury Extreme SSD Pro?

Mac Hammer Fan

macrumors 6502a
Original poster
Jul 13, 2004
778
109
Belgium
I tested the speed of my drives with Black Magic SpeedTest
OWC SSD 240GB:

Internal Harddrive Seagate 3TB:

Is this test accurate?
Although the results of my SSD are worse than these of the harddisk, the SSD disk boots faster.
Would reinitialize the SSD improve the results?
Here are the results from my new Accelsior 480GB SSD. Read speeds are here also below these promised on OWC's website, but I can live with that.

TIA
 
Last edited:

Mac Hammer Fan

macrumors 6502a
Original poster
Jul 13, 2004
778
109
Belgium
This SSD performed better in the beginning, I guess. It worked well when I bought it 3 years ago. It starts up fast. It is installed with an Icy Dock in the 4th drive bay of my Mac Pro. (Sata II)
When running XBench, I get the same results as in the beginning:
Results 342.95
System Info
Xbench Version 1.3
System Version 10.9.2 (13C64)
Physical RAM 16384 MB
Model MacPro5,1
Drive Type OWC Mercury Extreme Pro SSD
Disk Test 342.95
Sequential 212.24
Uncached Write 313.26 192.34 MB/sec [4K blocks]
Uncached Write 286.62 162.17 MB/sec [256K blocks]
Uncached Read 106.25 31.09 MB/sec [4K blocks]
Uncached Read 363.09 182.49 MB/sec [256K blocks]
Random 892.82
Uncached Write 1602.09 169.60 MB/sec [4K blocks]
Uncached Write 415.54 133.03 MB/sec [256K blocks]
Uncached Read 2919.82 20.69 MB/sec [4K blocks]
Uncached Read 903.34 167.62 MB/sec [256K blocks]
Of course it's not as fast as the Accelsior that I just bought.
 

Mac Hammer Fan

macrumors 6502a
Original poster
Jul 13, 2004
778
109
Belgium
I did some real world tests: I copied a 36 GB File
to the 3TB hard disk: 8 min
to the OWC Mercury Extreme SSD: 4 min
to the Accelsior SSD: 3 min
Therefore, in real world tests the OWC Extreme SSD doesn't perform that bad.
It boots very fast too. But the Black Magic Disk Speed Test results are bad.
I wonder whether they are accurate and reliable...
 

xcodeSyn

macrumors 6502a
Nov 25, 2012
548
5
I tested the speed of my drives with Black Magic SpeedTest
OWC SSD 240GB:
Image
Internal Harddrive Seagate 3TB:
Image
Is this test accurate?
Although the results of my SSD are worse than these of the harddisk, the SSD disk boots faster.
No, it's not accurate as explained here. Blackmagic test is quite meaningless for Sandforce-based SSDs, and Xbench is a better one as you already found out.
 

Tangu

macrumors newbie
Jun 21, 2010
17
0
UP for this post.

I tough my SSD was bad, but with Xbench it is okay performance with SATA 2 that i have with my mac pro.

I'll check if i can put a pci card with sata 3 and if it worth the shot, but 160 is okay for me :)