We’ve got just two drives from Seagate, so analysis is going to be an easy job. :)
Under the linear load (1 request in the queue), the ST3200822AS is head above its ATA-interfaced mate, although the two graphs drew nearer at 100-percent writing. Well, as you remember, the advantage of the SATA drive over the PATA model had been "planned" originally (see this article for details), so let’s not make a face as if we were in any way surprised.
Let’s see if the same goes for higher loads.
The drives both accelerated under a load of 16 requests when performing reads. The ST3200822A is slightly slower than its SATA mate under mixed loads, but is getting closer to it at high percentages of writes.
The discs perform more similarly under the maximum load. At 100% write requests, the drives deliver the same performance. At 100% reads, the ST3200822A is just slightly slower than the other drive.