Very bad 4K read speed with Sandisk SSD Plus 240GB, any idea why? - Overclock.net - An Overclocking Community

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Very bad 4K read speed with Sandisk SSD Plus 240GB, any idea why?

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post #1 of 16 (permalink) Old 09-02-2018, 03:35 AM - Thread Starter
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Very bad 4K read speed with Sandisk SSD Plus 240GB, any idea why?

I replace the harddisk with Sandisk SSD Plus 240GB which I bought few days ago in my old samsung notebook NP350V5C. The notebook is running windows 10 Home 64 Bits version and the SSD is running in SATA 3. I have tried to use the Microsoft chipset driver, turn off the Windows Write-Cache Buffer Flushing, run windows safe mode, run in high performance mode, check partitions are correctly aligned. The CrystalDiskMark score pic is attached. Any idea why the 4K read speed is so low? Thanks.
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post #2 of 16 (permalink) Old 09-03-2018, 09:38 PM
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It's mainly your laptop's power saving features holding it back. Plus the new spectre and meltdown patches make matters worse. Besides installing the latest IRST version that will install on it, there's not much else you can do.

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post #3 of 16 (permalink) Old 09-03-2018, 09:46 PM
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Im curious as to how 4k write speeds are far surpassing 4k read speeds. Percentage-wise, that is a huge margin.
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post #4 of 16 (permalink) Old 09-03-2018, 10:09 PM - Thread Starter
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Quote: Originally Posted by Sean Webster View Post
It's mainly your laptop's power saving features holding it back. Plus the new spectre and meltdown patches make matters worse. Besides installing the latest IRST version that will install on it, there's not much else you can do.
I check out other forum and people talked about this model has updated version with much worse cheap design, people get similar horrible 4k read speed. So this is WD money hungry problem.
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post #5 of 16 (permalink) Old 09-03-2018, 10:09 PM
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Quote: Originally Posted by mattliston View Post
Im curious as to how 4k write speeds are far surpassing 4k read speeds. Percentage-wise, that is a huge margin.
Because that is how NAND devices are optimized. It can program faster than read. Also, when the controller reads data it might have to utilize ECC to fix or verify the data it is reading before delivering it to the program.

For instance: http://www.thessdreview.com/featured...-review-1tb/3/

See the CDM result for the 660p? 55MB/s read 130MB/s write at QD1. Every SSD delivers faster writes than reads at QD1.

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Last edited by Sean Webster; 09-28-2018 at 09:57 AM.
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post #6 of 16 (permalink) Old 09-27-2018, 10:07 AM - Thread Starter
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Quote: Originally Posted by Sean Webster View Post
It's mainly your laptop's power saving features holding it back. Plus the new spectre and meltdown patches make matters worse. Besides installing the latest IRST version that will install on it, there's not much else you can do.
This SSD is really that bad:
https://forums.anandtech.com/threads...p-ssd.2553883/
and I have read stuff from forums, this last version uses USB flash drive controller and this is the main problem. Not going to buy any product from WD/Sandisk again, such a cheater company.
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post #7 of 16 (permalink) Old 09-27-2018, 10:29 AM
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Quote: Originally Posted by Sean Webster View Post
Because that is how NAND is optimized. It can program faster than read. Also, when the controller reads data it might have to utilize ECC to fix or verify the data it is reading before delivering it to the program.
Programing NAND, on a block for block basis, is generally no where near as fast as reading from it.

The reason why drives can often write, especially in smaller chunks, faster than they can read, is buffering/caching. You cannot cache a random read effectively without an enormous cache that already has the data you are looking for in it. You can cache any write, and even a small write cache can dramatically reduce the number of disk accesses needed.

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post #8 of 16 (permalink) Old 09-27-2018, 10:55 AM
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Probably a lot has to do with how full your SSD is. You've only got 8% free space.

My Sandisk SSD:


Intel i9 9900K Coffee Lake @ X8 5309mhz (+47.5%)
AMD FX-8320 Vishera @ X4 5022mhz (+43.5%)
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post #9 of 16 (permalink) Old 09-27-2018, 11:40 AM - Thread Starter
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This ssd model has few different generation with same name, read my link above for details. Very likely you bought much earlier version which is mlc. Current version uses usb flash drive contoller with tlc.
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post #10 of 16 (permalink) Old 03-31-2019, 07:13 AM - Thread Starter
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I have read different comments from other forums and this WD green ssd 4 read is really just that bad.
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