Quad core 4GHz CPU running each core at 1GHz?

[HirtheryDurthery]

I know this is an extremely stupid question but according to my ICT teacher in school, if a Quad Core CPU runs at 4GHz, each core is running at 1GHz and having the CPU set up with multiple cores improves multi-tasking because of this. I am pretty sure this is NOT true but I wanted to make sure about it.

Yeah, a lot of you seem to be disagreeing with him just as I am. But when I told him that he was wrong he just doesn't seem to accept it. Is there any way I could prove that he is wrong? Some sort of explanation or something? Sorry about my pretty bad English and how rushed this post is.

 

[KNARF XD]

I know this is an extremely stupid question but according to my ICT teacher in school, if a Quad Core CPU runs at 4GHz, each core is running at 1GHz and having the CPU set up with multiple cores improves multi-tasking because of this. I am pretty sure this is NOT true but I wanted to make sure about it.

all 4 cores will be running at 4GHz

 

[MeteorsRaining]

That made me laugh, hard. Each core runs at 4Ghz in that particular quad core.

 

[HirtheryDurthery]

That made me laugh, hard. Each core runs at 4Ghz in that particular quad core.

But are there any ways of proving that to him?

 

[MeteorsRaining]

I found this image of a hexa-core Phenom, your teacher's ideology is too stupid to be proved wrong. Anyways,

 

[turkey3_scratch]

Someone needs to teach the teacher 😉. Best way is to show the teacher this very topic. I am guessing the teacher is older and from the 90s when all CPUs were single core, so when dual-core and more came out he/she did not read up well enough.

A 4Ghz single core CPU would beat a 1Ghz quad-core any day because not all cores are always utilized whereas the single core is always doing work.

 

[slyu9213]

Your teacher must be old-school and not up to date with technology or at least terminology. Get a program that shows the clock speed of each core. For AMD there is OverDrive that will show the different clock speeds of each core. It should show that each core speed fluctuates depending on the workload.

It was several years ago when I last saw a program/person say a 3GHz Dual-Core was 6GHz, etc. Nicest way is to tell the teacher that '4GHz Quad-Cores' may have been 1GHz for each core back in the days but it is definitely not currently.

 

[turkey3_scratch]

Your teacher must be old-school and not up to date with technology or at least terminology. Get a program that shows the clock speed of each core. For AMD there is OverDrive that will show the different clock speeds of each core. It should show that each core speed fluctuates depending on the workload.

It was several years ago when I last saw a program/person say a 3GHz Dual-Core was 6GHz, etc. Nicest way is to tell the teacher that '4GHz Quad-Cores' may have been 1GHz for each core back in the days but it is definitely not currently.

I agree that the teacher must be old school.

 

[HirtheryDurthery]

Yeah, he may be outdated with his knowledge.

 

[turkey3_scratch]

Oh my now I just feel sorry for the false info sent to your class! Please inform your classmates of his mistakes!

 

[cmi86]

Somebody somewhere paid for this "education" This upsets me more than anything.

 

[MeteorsRaining]

cmi86 pretty much said it...

 

[Ryanrenesis]

Oh my lord, if that was true, my i5 @ 4.7 Ghz on each core would be a massive 18.8Ghz !!!

If you have a quad core, take a screen shot of your BIOS CPU settings, look for Intel Turbo Boost where you can see each core's Turbo Boost clock and show them that if he's right, your CPU should be running X times 4 cores = Ridiculous clock speed number

 

[irfan0922]

simple formula
if every core is 4ghz so manufacres need to say 16ghz for market purpose but they not using it because speed is 4ghz .
each core run max 1ghz and it make 4ghz .
if core share the speed for example in normal mode each core taking .2ghz and if when we run some thing heavy duty software so one of core can hit 3.6ghz means the core which need more power to run heady duty sotware other can help to hand over its power to core A to boost the performace it can be possible but in this case no .
each core max go for 1ghz becaue every process made buy intel the logic of tech is change , they change the trick of working method and improve day by day .
if you have single processor where late times we where installing 2 intel pantiam process was great idea we where getting 2 core cpu each was 3ghz . and total was 3+3=6 it was faster but they change the way ,
operation system and Proccessors changed
same sotware use 2 or more cores to boost the performance for example you running adobe photoshop your brush may use coreB and sotware runing on CoreA which mean the software doing malti tasking with help of Operating system.
teach is right ....

 

[RobCrezz]

That made me laugh, hard. Each core runs at 4Ghz in that particular quad core.

But are there any ways of proving that to him?

Easy way for me to display is by showing this VMware server. You can see that it displays each cpu running at 2.532Ghz, and you can also see that total usage is 2.6ghz with plenty to spare (27.7Ghz).

So a 4ghz quad core has 16Ghz total clock speed available, assuming it can distribute the workload across the cores accordingly.

So yeah, your teacher is incorrect.


Unfortunately many programs cannot distribute their processes across all cores.