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Difference between these two SSDs? What SSD to buy?

TheNuzziNuzz
By TheNuzziNuzz
in Storage Devices
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Posted
18 minutes ago, Jurrunio said:

note that it's IOPS and latency, they do not have to be linearly dependent on one another. It's just like saying the engine of a car's RPM must be proportional to the car's speed at all times.

Why's that ? If they're not dependent then your data is wrong. But even if that were the case then the line should've just continued on the IOPS axis to the lower latency, not the way the line travels back on the IOPS axis, it has multiple times where there are two points of intersection if you draw an additional vertical or horizontal axis, that shouldn't happen. It doesn't make sense.

unljaf38.png.b10e5df9219994f41f53daa8eed6e4e0.png

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Posted
26 minutes ago, Juular said:

Why's that ? If they're not dependent then your data is wrong. But even if that were the case then the line should've just continued on the IOPS axis to the lower latency, not the way the line travels back on the IOPS axis, it has multiple times where there are two points of intersection if you draw an additional vertical or horizontal axis, that shouldn't happen. It doesn't make sense.

unljaf38.png.b10e5df9219994f41f53daa8eed6e4e0.png

but what if it just slows down at some point (maybe because the drive fills up) causing the IOPS to drop? If latency shoots up at this time it will appear going towards the top left corner. Nothing's stopping IOPS to decrease. it's not a scale of time or bytes written (even though it is related to time).

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

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Desktop benching:

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SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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Posted
8 minutes ago, Jurrunio said:

but what if it just slows down at some point (maybe because the drive fills up) causing the IOPS to drop? If latency shoots up at this time it will appear going towards the top left corner. Nothing's stopping IOPS to decrease. it's not a scale of time or bytes written (even though it is related to time).

That's a possibility but data of this type should be represented by 3D graph, with time/amount of data/operations count as third axis, or two graphs, latency/time and IOPS/time, otherwise you have no point of reference.

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