for experet peapole

[faisal92]

i am wondering if i take a strong cpu multi cores in a built up pc will that pc last so long without lagging or overheating and that kind of stuff  

if the cpu speed is 3 ghz and has a  4 cores can is say this cpu overall speed is 12 ghz ? 

what's better cpu has 4 cores or cpu has 2 cores hyperthreaded to 4 ?

 

thanks in adance

[minibois]

- no you shouldn't say it's 12GHz at that point

- whichever has the best performance for what you do. you can compare a 5 year old 4 core CPU vs a new 2 core 4 threads CPU and the latter would be better. Do the opposite and the 4 core would be better. It's a question you can't answer without context (AKA: without knowing both CPU's)

 

The overheating part also has to do with the cooler you use and the lagging also has to do with the rest of your system and software.

What kind of budget do you have for your PC as a whole? That way I can maybe given some advice on parts.

[Mr.Meerkat]

Everything is really down to IPC, clock speed and number of physical cores and HT threads. If a 8 core CPU has 50% of the IPC of a 4 core CPU but at the same clock speeds then underload, if the program can utitlise all 8 cores then they will perform about the same but if only 1-7 cores then the 8 core CPU would be slower.

2 CPUs with the same IPC and numbers of cores but one is clocked lower then obviously the lower clocked CPU is slower.

HT is only filling the gaps in a CPU workload where if there was let's say a instruction that is queued to be processed with the core currently idling for one instruction, the HT would basically make the core process the queued instruction so less time is wasted with the core not processing anything (therefore resulting in better performance) but since it's piggybacking off an actual core and they aren't real cores, a real 8 core will beat a 4 core with HT (while same IPC and Clock speed.)