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Community Manager

Intel 520 180GB sudden write speed degradation

I have a brand new SSD Intel 520 180GB.

The sequential write speeds were around 220 MB/s at first (using SATA 2 here).

After just a few benchmarks and Windows 8 installation it's down to 170-180 MB/s.

The read speed is always the same, it's only the write speed that dropped.

I formatted and even completely erased the SSD with diskpart "clean all", but it didn't help. Ran the SSD Toolbox optimizer, scanned the drive.. no errors or anything, I just can't get the write speeds back to normal.

Any ideas?

I can post the pictures from benchmarks if you're interested.

Here's the screenshot from HDTune after the speed drop:

Does this look normal?

I'm using Windows 7 64, Gigabyte P55A-UD4, "native" SATA port (not Marvell).

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Community Manager

I installed the benchmark program you used. Read test went fine. When I tried to do a write test the program complained that write tests were disabled because I had active partitions on the disk and they had to be removed before write tests could be done. Removing/deleting partitions on my setup isn't an option because it's the only disc in my computer! I was just curious how my SSD 520 performance compared to your results.

Community Manager

You can try with CrystalDiskMark CrystalDiskMark and AS SSD Benchmark, which don't require deleting partitions.

Here are my results before and after:

Some say this is just normal degradation after writing incompressible data. In fact if I try with Atto, which tests with compressible data, it's the same as before.