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Serial ATA 300MB/s performance
To explore the impact of 300MB/s transfer rates, we switched the Deskstar T7K250 over to an ICH7R-based platform and tested the drive with 150MB/s and 300MB/s interface speeds. For compatibility reasons, the Deskstar actually defaults to 150MB/s Serial ATA transfer rates, but the drive ships with a utility allowing users to set the interface speed to 300MB/s.

WorldBench overall performance

So much for faster interface speeds. WorldBench shows no difference between the T7K250's performance with 150MB/s and 300MB/s interface speeds.

Boot and load times

There's little to no difference in load times, either.