does multiple cores effect speed

[MR ORANGE]

Pc 1 has 2 cores, clock speed= 2.75ghz
Pc 2 has 4 cores , clock speed= 2.50ghz


which cpu will be able to procces the fastest

 

[kanewolf]

It depends on the software and the architecture of the CPU. AMD CPUs at the same clock speed have been slower than Intel CPUs for a long time (less efficient). If the software can only use one core then the higher clock speed wins. But if the software can efficiently use all cores then the multi-core wins.

 

[USAFRet]

Pc 1 has 2 cores, clock speed= 2.75ghz
Pc 2 has 4 cores , clock speed= 2.50ghz


which cpu will be able to procces the fastest

It depends. Can the software use all cores? Some do, some don't

Consider a 2 lane road with a 60mph speed limit, and a 4 lane road with a 50mph speed limit.
Both at max capacity.

The 4 lane will allow more cars per hour. Almost but not quite twice as much.
But if you (the software) can only drive one car at a time (one core), then the 2 lane road with the faster limit wins.

 

[cryoburner]

The processor generation makes a difference too. For the most part, each generation of processor is a bit faster than the previous, getting moer performance per clock. So, even though the one processor might be clocked higher at 2.75 GHz, if it's a few generations older than the 2.50 GHz one, there's a good chance that it will be slower.

Additionally, these processors might boost to different speeds under load. Just because one processor has a higher base clock, doesn't mean it will boost to a higher speed than the other when presented with a heavy processing task. To provide a more definitive answer, we would need to know exactly what model the two processors are, and what you intend to use them for.

 

[USAFRet]

The processor generation makes a difference too.

Exactly.
A 3.0GHz Pentium 4 is significantly slower than a 2.4GHz i5, even in strictly single core tasks.