Hello, I recently upgraded my windows hardware by installing a new motherboard and an i9-9900KF processor at 4.8GHz. My old arrangemet used an i7-980X at 4.2GHz. Both machines run with same Win10 pro. Running Rosetta I see the old CPU takes about 5 hours to complete single tasks while the new one employs 8 hours. How is it possible? Perhaps Rosetta sends heavier tasks depending on CPU speed?
Thank you.

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Rosetta@home tasks are fixed duration, not fixed work. They will all run to a target CPU time of 8 hours (or whatever you choose in your project preferences) regardless of CPU speed. The recent tasks on the i7 ran for 8 hours, not 5.

April fool?

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Okay, so I just checked out my machines, the i7 starts every task with a remaining time of 5 hours and 56 minutes, while the i9 starts with 7 hours and 55 minutes, but in the end both computers complete the tasks in roughly 8 hours. So let me say it looks Rosetta works like modern computer games (computing speaking....) which run always the same way regardless of hardware speed.

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The i7 appears to BOINC to be a new machine (as the i9 has inherited the older ID), and for new hosts the initial remaining time estimate is always off. Give it a few days and you should find that it too will show each task as needing 8 hours to run.

Ok, thanks a lot for the explanation, I was a little bit concerned to have wasted money for an i9, of course I didn't buy it for Rosetta only.....

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Don’t worry. The performance measurements from BOINC’s Whetstone benchmark show the i7 at 4.96 GFLOPS and the i9 at 5.95, and the i9 is already earning substantially more credit per task. Everything’s fine…