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Category: Support
Forum: BOINC Agent Support
Thread: Hyperthreading not working? |
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Thread Status: Active Total posts in this thread: 5
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RTS48
Veteran Cruncher Bolivia Joined: Aug 2, 2009 Post Count: 1353 Status: Offline Project Badges: 
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Hi, I have just acquired a second hand iMac 21.5" Quad core 3.8GHz Intel i3 processor with 8Gb of memory. I also run at home a 15" Mac Book Pro (late 2013) and a 27" iMac (2010) both of which are quad core Intel i7 processors. On the Mac Book Pro and the 27" iMac I can run 8 threads but on the 21.5 iMac I can only get 4 threads to run. Why??
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Rod Peel
Santa Cruz Bolivia South America  ,  |
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Falconet
Master Cruncher Portugal Joined: Mar 9, 2009 Post Count: 3315 Status: Offline Project Badges: 
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You don't list the exact i3 model but I'm fairly certain there aren't any 8-thread i3 CPUs.
---------------------------------------- - AMD Ryzen 5 1600AF 6C/12T 3.2 GHz - 85W - AMD Ryzen 5 2500U 4C/8T 2.0 GHz - 28W - AMD Ryzen 7 7730U 8C/16T 3.0 GHz |
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Acibant
Advanced Cruncher USA Joined: Apr 15, 2020 Post Count: 126 Status: Offline Project Badges: 
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I only see that 21.5 iMacs with an i3 ran at 3.6 GHz. Specs. The i3 series is lower-end and it only has four threads (no hyperthreading). Intel specs.
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RTS48
Veteran Cruncher Bolivia Joined: Aug 2, 2009 Post Count: 1353 Status: Offline Project Badges:
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Many thanks for your replies. Sorry, you are right 3.6 GHz it is. I'm just somewhat disappointed as my old 27" iMac has given faithfull 8 thread service for getting on for 80 CPU Years. I just find it hard that Intel / Apple would take a step backwards between 2010 and 2019.
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Rod Peel
----------------------------------------Santa Cruz Bolivia South America , [Edit 1 times, last edit by RTS48 at Aug 21, 2021 1:58:28 AM] |
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Mike.Gibson
Ace Cruncher England Joined: Aug 23, 2007 Post Count: 12594 Status: Offline Project Badges: 
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It is not a step backward. There were i3 machines back then and i5 and i7. Now you can also get i9's. The choice is there.
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