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old desktop PC 4770 Vs new lenovo i7

rangor gubbins

rangor gubbins

rangor gubbins

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Kent, UK
I've got an old desktop PC with an i7-4770K CPU @ 3.50GHz (i don't bother overclocking it these days). And my work laptop which is a 12 month old lenovo something or other, with an i7 CPU (can't remember which one off the top of my head). I've noticed that when it comes to CPU intensive tasks, e.g. some simple image analysis or statistical analysis, my old desktop PC is usually faster than the laptop. On both systems the same process maxes out the CPU (and does not use the GPU), but the old one is usually faster or at least no slower. Why is my >10 yr old CPU be beating a 1 year old CPU of the same class? Or to put it another way, why is the laptop so crap when it comes to CPU intensive tasks?
 
Get the exact specs of the laptop and we can check some stuff.

Would be a good idea to run a benchmark like Cinebench too, to assess if the laptop is themal throttling.
 
It depends on how the software uses multiple cores. The i7-1255 (12th gen) only has 2 performance cores with 8 efficient cores - so 12 threads in total. If the software can only make use of 2-4 cores say, the 4 cores of the i7 4770K might well be faster.

Even if the software can use all of the cores/threads, its also only a 15W CPU, so it will spend much of its time at a much lower GHz than the 4770K.
 
Would expect the laptop to kick its behind easily unless it is crippled with a pathetically low amount of RAM or something.

On cpubenchmark tests, the desktop part average multi score 7132 and single core 2162
the laptop part multi 13616 and single core 3267

So as you can see in short test the laptop CPU thrashes the desktop part.

One thing you may be experiencing is the laptop CPU is so badly cooled that it is throttling the frequency right down and trashing its performance.

Sadly with thinner and thinner laptops generally comes a tiny pathetic cool fan.
 
The efficiency cores of the 1255u isn't great either (in terms of performance)
Also, is the program you're using able to make use of multi threading on 10 cores?
 
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According to Passmark the laptop with the 17-1255U should be almost double the performance of the i7-4770 in every aspect.


I am pretty sure i have that same cpu in my Lenovo Thinkpad T15S and its nice and zippy.

Are you comparing tests done on the desktop against the laptop on battery or plugged into the mains?
 
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It's plugged in.
I'm wondering if there's a setting somewhere that's limiting the cpu, or as mentioned before it's being thermo throttled. I've put the laptop on a mesh now so that it has airflow underneath.
It's a Lenovo thinkbook 15 G4 IAP. I definitely would not call it snappy. It's also slow to navigate in file explorer, slow to open files, but maybe that's due to network issues/setup.
 
It's almost certainly thermal throttling when running CPU intensive tasks. It'll hit 4.7GHz for a few seconds but if you open task manager when under prolonged load I doubt the CPU would be running at much above 2GHz.

I have an i7-1165G7 in my work laptop. It's fine for short bursts of activity but very slow for longer workloads.
 
I had one of those i7 12th gens with 2 P cores and for my uses it was bloody useless. Bogged down with all the security crap and most software only seeing the P cores it was like using a dual core machine with one core always occupied with security scans.
 
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