Desktop CPU v Mobile CPU

Does anyone know how much of a difference there is between the performance of a desktop cpu and a Laptop cpu as looking at the passmarks website there are cpus like the i7 2670 qm that are more powerfull than a i5 2500k and the i2960xm is very closes to the i7 2600k how is this possible or am i missing something.

 

Different features etc. such as the 15-2500k does not have hyperthreading available. TurboBoost of the 2960 is 3.7 and is 3.8 on the 2600k. Alot of these things will affect synthetics such as passmark............

 

There is and there will always be a difference in performance between desktop and laptop CPUs. Desktop CPUs will always be faster as they clock higher than laptop CPUs. They clock higher because cooling solutions are never a problem on a desktop, while on a laptop it is (limited space = limited cooling potential = lower CPU speed).

 

i always prefer to rely on notebookcheck

Mobile Processors - Benchmarklist - Notebookcheck.net Tech

cheers

 

Passmark CPU Benchmark:

2670QM: 6803
2600K: 9102
2960XM: 8544

 

Every Manufacturer seems to be offering a $150 upgrade from the Intel Core i7-2760QM 2.4/3.5ghz to the Intel Core i7 2670QM 2.2/3.1ghz..

Do y'all think thats worth the change?

 

No, unless you crunch number/video edit all day.(where you better off get a desktop)

 

I think I've got 11700ish Passmark on my CPU.. Passmark scores are an average, right?
Notebookcheck scores are always at stock.

You have to remember that some people (can only) run it at stock multis and some overclock...

The mobile XMs are pretty insane though.. I can get 30K Vantage CPU on it, the only thing that stops me getting higher is cooling.

 

thats what i'm saying the i7 2960xm nearly performs as well as an i7 2600k at nearly half the wattage i no the i7 2960xm cost like £850 to the i7 2600ks £250 but does this mean that intell are holding back with there desktop cpus and could do better but chose not to because most people dont wont that sort of power.

in fact if you look at the i7 2960xm it looks to be an i7 2600k with lower wattage and a lower clock speed when all 4 cores are being used

 

Well, my 2920XM pulls around 85+ watts during full load @4.5Ghz... I've seen people go to 100+ watts for 5.0Ghz... all the way up to 130 watts in a laptop, lol.

It's just rated 55w for the stock clocks.

 

How do you draw up the conclusion i7 2960xm nearly performs as well as an i7 2600k?

 

Core i5 2500K and Core i7 2600K review

2920XM gets 29k @ 4.4Ghz, 30K at 4.5Ghz

The M18x users w/ 2920/2960XMs have pushed for 32-33k on Vantage. Just shows that clock for clock desktop and mobile 2nd gen CPUs are more or less the same.

However, it all boils down to:

 

notebookcheck.net has benchmarks for both processors at stock and they get very similar results
........................ i7 2600k v i7 2960xm
ciniebench r11.5.......... 6.8 v 6.3
super pie 1m............... 10.2 v 10.2
super pie 32m ............ 559.2 v 568.2

also both have 1m+8m cache both have 4/8 core/threads i7 2600k is 3.4gh-3.8 the i7 2960xm has 2.7 ghz-3.7ghz

 

The mobile SB is essentially a downclocked desktop version, with the former having such a similar score due to turbo-boosting to higher levels).

It would be easier for Intel to simply make 1 cpu for both desktops and laptops.
The main limitation being that in laptops, OC-ing would be limited because of potential overheating and stock speeds would be lower.

But we know it's far more profitable to make 10 separate products and charge different premium price tags for them.

 

can't blame them for holding back as they don't have any competition at the moment.

 

This.

They really don't. AMD cannot compete with current SNB, much less IVB, in a desktop or notebook. Intel could probably release a new CPU tomorrow that would put SNB and IVB to shame, but since there's no high-end competition... why do it? Until AMD pushes back, not much will change...

 

Today there is not a big gap anymore between mobile and desktop CPU's.
A few %, unless you want the max performance (including overclocking) you should go for a desktop CPU.
But at stock speeds,there's not that much difference (thanks to turbo boost)
(GPU is another story...)

 

Well, cost is a big factor too.

 

It's not as if intel are holding back as such, just that the mobile chips are the more efficient of the bunch. Desktop chips don't have the same power constraints so it doesn't make sense for them to charge you for something you don't need.

I'm not denying that they have un-released tech (i.e. the gigaflops research chip), but the power difference between laptop and desktop parts only really comes down to application and the binning process.

EDIT: meant to say terraflops research chip

 

2670qm is fine for gaming unless you have an xfire or sli 6990m/580m at which point you may want a little more.