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On the topic of iStats Menus; I have iStats Menus 6 installed on my 5,1 Mac Pro with six-core single CPU. Why does iStats Menus insist on displaying CPU A and CPU B in the menu when clearly there can't be any data to show for CPU B as my machine has just 1 CPU?

Is iStats simply not reading the system correctly?
Is there a second cpu socket on your Logicboard?
 
On the topic of iStats Menus; I have iStats Menus 6 installed on my 5,1 Mac Pro with six-core single CPU. Why does iStats Menus insist on displaying CPU A and CPU B in the menu when clearly there can't be any data to show for CPU B as my machine has just 1 CPU?
Is iStats simply not reading the system correctly?

With a six-core CPU I wouldn't care about any kind of that software but just enjoy ...
 
That's a good question. Where might that be located in the board if I were to check?

Whatever the case, if your Mac Pro shipped with a single processor, however many cores it has, then you don't have a place on the logic/main board for a second physical CPU. Unless I’ve missed something over the years, multiprocessor systems as with some Mac Pro versions will not function if only one CPU is fitted. Steps 19–21 of a Mac Pro teardown on iFixit is your definitive visual reference check if you’re still feeling some doubt about what you have.

For your setup, iStat Menus will show, depending on your configuration settings, either all logical cores as discrete graphs/percentages or as an amalgamated single physical processor.
 
Whatever the case, if your Mac Pro shipped with a single processor, however many cores it has, then you don't have a place on the logic/main board for a second physical CPU. Unless I’ve missed something over the years, multiprocessor systems as with some Mac Pro versions will not function if only one CPU is fitted. Steps 19–21 of a Mac Pro teardown on iFixit is your definitive visual reference check if you’re still feeling some doubt about what you have.

For your setup, iStat Menus will show, depending on your configuration settings, either all logical cores as discrete graphs/percentages or as an amalgamated single physical processor.
Aha, I didn't know that. Thought they share the same two socket logic board
 
Whatever the case, if your Mac Pro shipped with a single processor, however many cores it has, then you don't have a place on the logic/main board for a second physical CPU. Unless I’ve missed something over the years, multiprocessor systems as with some Mac Pro versions will not function if only one CPU is fitted. Steps 19–21 of a Mac Pro teardown on iFixit is your definitive visual reference check if you’re still feeling some doubt about what you have.

For your setup, iStat Menus will show, depending on your configuration settings, either all logical cores as discrete graphs/percentages or as an amalgamated single physical processor.

Thank you for your answer. I am 100% certain that my model has 1 CPU. I have added a screenshot to display what I am referring to in iStats menu:
 

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Thank you for your answer. I am 100% certain that my model has 1 CPU. I have added a screenshot to display what I am referring to in iStats menu:

Still having this issue. Anyone know why iStats menu is showing two CPU's when I clearly only have a one CPU machine?
 
Still having this issue. Anyone know why iStats menu is showing two CPU's when I clearly only have a one CPU machine?

Out of curiosity, did you run a trial of iStat Menus 5 (or an earlier version) since you last posted your question about iStat Menus 6? The likelihood isn’t high, but an earlier version might correctly render/recognize the number of cores you have on your CPU and show either the discrete logical core graphs, or the combined of those cores as one processor. If so, then there might be a bug in 6.x.

I haven’t used iStat Menus 6, so I can’t speak to that version. I’m using iStat Menus 5.3. On 5.3, there are two toggles involved (“combine cores into one item” and “combine logical (Hyper-Threading) cores”). Version 6 may either be similar or offer additional toggles I’m not aware of.
 
Out of curiosity, did you run a trial of iStat Menus 5 (or an earlier version) since you last posted your question about iStat Menus 6? The likelihood isn’t high, but an earlier version might correctly render/recognize the number of cores you have on your CPU and show either the discrete logical core graphs, or the combined of those cores as one processor. If so, then there might be a bug in 6.x.

I haven’t used iStat Menus 6, so I can’t speak to that version. I’m using iStat Menus 5.3. On 5.3, there are two toggles involved (“combine cores into one item” and “combine logical (Hyper-Threading) cores”). Version 6 may either be similar or offer additional toggles I’m not aware of.

Haven't tried version 5.3 to be honest. Maybe I should give that a try to see if it resolves the issue. Alas it won't provide me with an anwer as to why it occured in the first place.
 
Haven't tried version 5.3 to be honest. Maybe I should give that a try to see if it resolves the issue. Alas it won't provide me with an anwer as to why it occured in the first place.

If 5.3 worked, it might tell you there’s a bug in 6.x which the developers might need to know about for an update. They might be able to explain why it does that on your system. Once it’s resolved in an update, you could then return back to the current version.
 
Just happened to be poking around and came upon this thread.

I had totally forgotten about MenuMeters! Sadly gave up on it since it was not supported beginning in El Capitan and never looked back.

I only use it for troubleshooting or ad-hoc investigation rather than leaving it in the menu bar all of the time (so it is the leftmost item). Other items I have up there from left to right: BwanaDik (click on icon to see internal and external IP addresses and interface MAC addresses), Itsycal (to see a small month calendar), and Fanny (fan RPM monitor, CPU and GPU temps too) followed by standard Apple stuff.
 
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