View Full Version : New Sandisk 240GB Extreme SSD- IOPS seem low

13-06-2013, 06:41 PM
Should have got the Samsung. :p

Anyway, I got the Sandisk Extreme 240GB, this (http://www.sandisk.com/products/ssd/sata/extreme/)one. I've only got SATA 3Gbps, so I know that's a bit of a limit, but when benchmarks are run, the IOPS I'm seeing aren't as high as I was expecting. Everything else seems good - I'll attach a bunch of screenshots, I'm limited a lot in sequential writes by the 3Gbps interface, but seem to be seeing about what I'd expect there.

Do you guys think this is right? Thanks. :)

5052 5053 5054

pablo d
14-06-2013, 10:25 AM
SATA 3Gbps will limit your IOPS as well, not just your maximum transfer rate. Here is what I got on my Extreme 120GB over 6Gbps, which should in theory get slaughtered by a 240GB:

Random 4KB Read (QD1)
"20 MB/s
5,189 IOPS"

Random 4KB Write (QD1)
"117 MB/s
30,180 IOPS"

Random 4KB Read (QD16)
"69 MB/s
17,843 IOPS"

Random 4KB Write (QD16)
"136 MB/s
35,037 IOPS"

P.S. this was using Anvil SSD tool which uses incompressible data.

pablo d
14-06-2013, 10:30 AM
So yeah you're actually looking alright tbh, hitting over 40K IOPS at least.

14-06-2013, 10:59 AM
I think synthetic benchmarks only matter when reviewing drives. My intel 320 120GB SSD is only a 3GB/s and benchmarks much slower than the Samsung 830 256GB I replaced it with but in practice the only difference I can notice is the size. Don't worry about it.

pablo d
14-06-2013, 11:59 AM
^You're completing ignoring the placebo effect that benchmarking has on the user :p

The other thing to check is which SATA port you have it plugged into. A lot of mobo's have 4 or so native SATA ports and a couple of 3rd-party ports which are usually a different colour. The native ports are generally better for performance.

14-06-2013, 01:30 PM
Fantastic, thanks. Yeah I wasn't worried about it - I figured it was just the way that benchmark tested, with small queue depths. And I wanted to make sure there wasn't actually something wrong with the SSD. :badpc:

I ran anvil and things are better than expected. And yes, it is in one of the Native SATA ports. :)