Mobile Ivy Bridge vs Desktop SB and IB

I'm waiting for the 7970m to be available for purchase, but mean time I need to decide if I am going to order Mobile ivy bridge or wait for the clevo/sager re-design for the p270 ( desktop 6-core prosessor).

Has anyone found any real reviews with mobile ib ( 3820qm or 3920xm) vs sb 2600k or ib 3770k / 3770?

I'm currently using 2600k for my work ( photoshop, indesign, 3d, etc) so if I decide not to wait for the delayed p270 from clevo, would I lose much power against my current 2600k with the mobile 3820qm or 3920xm?

 

Theres not much difference but if you are getting a 3820qm it should easily beat your 2600k at stock.

Mobile Processors - Benchmarklist - Notebookcheck.net Tech

This shows it basically wins on the benchmarks so you won't lose any power, you will gain more power maybe slightly but the hd 4000 will be a big boost.

 

It depends on the cooling system of your laptop. With a good cooling system, there is very little difference between a 3820QM and a stock desktop 3770K and because of the instructions-per-clock advantage, you might even be able to beat a desktop 2600K (but only at stock, those things go up to 5GHz or more at which point you have no chance). However, this requires the CPU to operate at near the maximum Turbo frequency the entire time so it will not happen with all laptops.

 

I'm not interested at overclocking, because I need absolute stability. With gaming I might overclock but if mobile ib with stock clocks can match my 2600k , I think I can order one of those. Darn shame that they delayed the desktop processor version from clevo.

So cooling wise, should I go with the 17" version or 15" version from clevo? I thought i read that they have the same cooling?

 

17" and 15" definitely don't have the same cooling (even if the parts are identical).

Contrary to others here, I would not bet that a notebook 3820QM will be able to outperform (consistently and continuously) a desktop 2600K.

I would say you'll have to hold off a couple of generations before notebooks match the power of even 'last years' desktops (simply because of heat limited throttling...).

If you're pushing the limits of your desktop i7 2600K for hours at a time, then I wouldn't bet money/buying a notebook that even an IB 3820QM would be able to match it. Not even with an 18.4" model.

As far as 'absolute stability', my desktop 2600K with a $30 aftermarket cooler runs cool and stable (year+) at 4.5 GHz which no notebook will likely touch for a long, long time.

EDIT: And here is some 'proof' for my thinking:

See:
http://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-3770K+%40+3.50GHz

When another desktop cpu only beats the i7 2600K by ~14%, I would not hold my breath for a notebook to be able to surpass it.

Good luck.

 

This was true a prior to the advent of Sandy Bridge, but not since then. Intel knows that the days of 100W+ desktop CPUs are numbered and with each generation, they optimize more and more for lower power consumption. Unfortunately, few sites compare desktop to laptop CPUs directly, but here is a pair of recent AnandTech articles that include results for the 3720QM and the 2600K. Not all of the benchmarks are common, but at least have Cinebench is:

Cinebench R11.5 Single Threaded:
3720QM: 1.49
2600K: 1.52

Cinebench R11.5 Multi Threaded:
3720QM: 6.84
2600K: 6.86

There are also some x264 benchmarks (the 3720QM wins), but I'm confused about what they say about the versions so there's no point in quoting them. The 3720QM is about the same as a 2600K; the 3820QM should be just a little bit faster.