Intel old i7 processor faster than newer i9?

Questions and Answers : Windows : Intel old i7 processor faster than newer i9?

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Profile Neo (ClaudioP)

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Message 100965 - Posted: 1 Apr 2021, 11:03:42 UTC

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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Brian Nixon

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Message 100969 - Posted: 1 Apr 2021, 11:19:48 UTC - in response to Message 100965.  

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.
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Sid Celery

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Message 100972 - Posted: 1 Apr 2021, 12:45:38 UTC

April fool?
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Profile Neo (ClaudioP)

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Message 100986 - Posted: 1 Apr 2021, 17:03:41 UTC

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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Brian Nixon

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Message 100987 - Posted: 1 Apr 2021, 17:34:04 UTC - in response to Message 100986.  

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.
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Profile Neo (ClaudioP)

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Message 100991 - Posted: 1 Apr 2021, 18:16:45 UTC

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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Brian Nixon

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Message 100992 - Posted: 1 Apr 2021, 18:35:15 UTC - in response to Message 100991.  

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…
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Questions and Answers : Windows : Intel old i7 processor faster than newer i9?



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