I ended up ordering an i7/M395 256GB SSD, but I'm rather worried about whether the SSD performance would be significantly slower than the 512GB, particularly as I've heard mixed things. Has anyone actually run benchmarks like Black Magic on these and is able to post them so we can see the difference? It would be much appreciated.
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Any 27" Late 2015 iMac SSD Benchmarks?
- Thread starter Kappsi
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No, they have Pcie drives which should be 2.5x faster
Apples website says:
"For maximum performance, you can configure iMac with up to 1TB of PCIe-based flash storage that’s now up to 2.5 times faster than the previous version.2 Delivering up to 1800 Mbps of sequential read performance, pure flash storage is the fastest way to speed through the most demanding tasks"
"For maximum performance, you can configure iMac with up to 1TB of PCIe-based flash storage that’s now up to 2.5 times faster than the previous version.2 Delivering up to 1800 Mbps of sequential read performance, pure flash storage is the fastest way to speed through the most demanding tasks"
I run a macbook pro with a 64gb ssd for 4 years now. I use my computer as an instance of osx. I don't have any precious content on it; just software. 256gb is enough at that price.
Here is a QuickBench test on the new 27" with a 2TB Fusion drive. This is a fresh install so it is only testing the SSD although you can tell from the write speeds that there is some logic going on behind the scenes that slows it down; likely to see whether the data should be written to the HDD or the SSD.
I don't think that there's anything going on in the background. the Fusion Drives of the late 2015 iMac have SSDs with only 24 or 32 GB capacity. they simply can't take (write) more than 650 MB per second.
Thanks! If the 128GB from a Fusion drive can reach these read speeds, the 256GB should certainly be able to.
This does make my decision of 256 vs 512 rather harder though.
I have a second computer that I'd expect to use for gaming (except perhaps at LANs), while using this one for browsing and programming. 256 is almost certainly fine, particularly since I could use an external SSD later, but that speed is just fantastic...Could someone with a late 2015 27" iMac with the 512GB SSD provide benchmarks?
Here is a QuickBench test on the new 27" with a 2TB Fusion drive. This is a fresh install so it is only testing the SSD although you can tell from the write speeds that there is some logic going on behind the scenes that slows it down; likely to see whether the data should be written to the HDD or the SSD.
That's very strange, my late 2015 27" 2TB fusion drive only scored up to around 700MB/s read/write on backmagic, but maybe blackmagic is just behaving weirdly. Do you mind sharing a screenshot of the details of your drives in system report?
@dezza85 got a late 2015 5k with a 2 TB fusion and is seeing similar results in black magic as @Kappsi in quick bench.
https://forums.macrumors.com/threads/just-picked-up-3-3ghz-late-5k-imac.1929606/#post-22102078
He tested the 2TB fusion drive. His theory is that his test is only hitting the SSD in the fusion drive. It would be faster as the late 2015 iMac uses a faster SSD.
Ok so I just booted up blackmagic and let it run for a little bit longer this time. It looks like what is happening is the stress file transfer is completing too quickly for the 'read' speed meeter to get to the actual speed that the drive is working at, and while leaving it on, it continually reaches higher speeds until the HDD kicks in and slows it right down, so I never actually see the meter go to speeds like 1600MB/s. However, the 'how fast' columns are showing speeds on par with dezza85.
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Well, I cancelled my 256GB and am going to reorder the 512GB. The SSD speed is too nice to use an external, and the upgrade price is surprisingly reasonable. Unfortunately since the previous charge will still apply to my credit limit, which is too low to be able to order until that's gone, looks like I'll not only lose my place in the queue but then also have to wait a few extra days as well. The Apple Store FAQ says:
Does anyone have any experience with how long it usually takes, or what that request to remove the authorization is?