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Old 04-14-2012, 06:41 AM
Join Date: Mar 2012
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Default Does SATA 2 interface limit my 4K Random Read/Writes?

I've learned that the third-party Marvell SATA 3 ports on my mobo are actually slower than my chipset's SATA 2 ports, so I'm going to be using the SATA 2 ports for my upcoming upgrade to an SSD.

I'll still buy a SATA 3 drive so that I'm 'future-proofed'. I don't really care about the slower sequential data transfer because large sequential data is less relevant than the day-to-day small random IOPS.

The drive I wanna buy says this in the specs:

Max Sequential Read: Up to 550 MB/s (SATAIII) / Up to 280 MB/s (SATAII)
Max Sequential Write: Up to 500 MB/s (SATAIII) / Up to 260 MB/s (SATAII)
4KB Random Read: Up to 25,000 IOPS
4KB Random Write: Up to 40,000 IOPS

So I am wondering: by using a SATA 2 interface, am I also reducing the IOPS? Or are those zillions of tiny random reads/writes not affected by the port's maximum throughput?

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Old 04-14-2012, 07:00 PM
zeo's Avatar
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So long as the throughput doesn't exceed the limits of the connection then it should perform as indicated. Though the SATA Controller can effect overall performance of the drive. So this may vary a bit from system to system but generally should be very close to the indicated max for the small read/writes.
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