Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
1TB Fusion Disk speed test results
- Thread starter myname70
- Start date
- Sort by reaction score
The Black Magic Disk Speed Test isn't the best tool for testing Fusion drives due to the test-file size which is larger than the SSD assigned write buffer size. Thus you are actually seeing more of the hard disk speed than the SSD speed itself. The read speed may also be affected by this.
You might try the AJA System Test as it gives somewhat more test flexibility.
https://www.aja.com/en/products/aja-system-test
Also, as mentioned above, selecting a smaller test file size rather than the default may show more accurate results.
However, due to the way the Fusion drive operates, it is difficult to determine exactly what the transfer speed is since the results will be highly dependent on how much data is actually in place on the Fusion drive (i.e. is the drive almost empty so that all your files including the test file are on the SSD, or is the Fusion algorithm moving things around on the hard disk because you have exceeded the capacity of the raw SSD part of the joined drives).
Allow me to show off my significantly smaller, but significantly faster 256GB SSD in my 21.5" iMac (3.1 i7/16/SM0256F/750M)
*troll face*
I had the option of choosing between the Fusion drive and the 256GB SSD, and since I needed pure performance (I keep all my media offshore), I went for an SSD instead.
Attachments
Last edited:
RAM disk eh?
Let me outspeed you
I frequently use RAM disks myself to reduce writes to the SSD when working on projects, so I normally create RAM disks about 24-32GB in size (out of a total of 64GB in my cylindrical Mac Pro baby).
Attachments
RAM disk eh?
Let me outspeed you
I frequently use RAM disks myself to reduce writes to the SSD when working on projects, so I normally create RAM disks about 24-32GB in size (out of a total of 64GB in my cylindrical Mac Pro baby).
Very cool to see some old school tricks being used with a new device. Kudos.
RAM disk eh?
Let me outspeed you
I frequently use RAM disks myself to reduce writes to the SSD when working on projects, so I normally create RAM disks about 24-32GB in size (out of a total of 64GB in my cylindrical Mac Pro baby).
You beat me
, haha~I usually use 10G of RAM for caching or other use (out of my 32G RAM). Anyway, it's good to see that the nMP RAM write 18% faster than the oMP.
You beat me
I usually use 10G of RAM for caching or other use (out of my 32G RAM). Anyway, it's good to see that the nMP RAM write 18% faster than the oMP.
The screenshot was actually on my rMBP
Anyway, yeah, the RAM operates faster because 1600 MHz is a step up from 1333 MHz.
Guys, sorry for the silly question -but how can I set a RAM drive?
Guys, sorry for the silly question -but how can I set a RAM drive?
You can download some free apps from AppStore for this purpose.
Guys, sorry for the silly question -but how can I set a RAM drive?
I use TmpDisk for creating RAM disks.
Thanks. So, RAM disk uses somehow the available RAM? Is slow down the overall performance of the iMac? I have 16GB RAM
It won't slow down as long as you don't fully utilize RAM.
For instance, I know that my Photoshop work uses around 5-6GB of RAM. The file itself is 1GB. So I create a 1.5GB RAM disk (out of a total of 16GB). This means I still have 14.5GB of RAM for everything else. So it'll be enough for whatever I'm doing at that moment.
The old days when 64K of RAM was already the flower of technology
At times I miss those days of early DOS and later, OS/2. I also remember showing a programmer (of all people sigh) how to create a RAM drive and do his compiling within. The difference was incredible. Then again, I remember J-RAM and PCs when a "co-processor" was an add on. At that time I used CAD programs to do basic layouts for graphic paste up. The print out would take several hours with a dot matrix printer (without the co-processor).