changing CPU for Z² generation?

Hello!I just noticed this item on ebay Intel I7 640M and i was thinking to change my cpu from my vpc z13a7e which has the i5 460M in that time i didn't have enough money to buy one with this cpu the problem is that i still have more than 2 years guarantee and to make this change at sony is very expensive so could someone give his opinion about the i7 cpu if its worthy to change with this one or not?
PS: i wanna sell the i5 cpu like so i don't need to much money for the price difference

 

There's not a huge difference between the two processors, although obviously it depends what you do with your laptop.

If it was mine I wouldn't consider the potential loss of two years' warranty worth it for a relatively minor upgrade, although others may disagree.

Edit: see beaups's comment below.

 

Z CPUs are soldere on the board, you aren't going to be able to upgrade it.

 

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What he said. No CPU upgrades possible for the Z series.

 

at least not the VPC-Z series, the VGN-Z series had their cpu socketed on (and replaceable) afaik.

 

True, they are soldered, but technically, you CAN unsolder and solder a new BGA CPU. This requires appropriate tools (rework station) and skills or for 99% of us a load of money. Of course this kind of upgrade doesn't make ANY sense for the average user.

 

^Maybe technically YOU can, but I certainly can't ...and I suspect OP can't either

 

but that's stupid because for the first generation of z series you could do that why had they made it like so?

 

They save a couple of bucks, and one process less in the factory cell. Multiply by number of machines produced.

 

Isn't the VPC-Z series thinner than the VGN-Z series? I guess that is the byproduct of being "obsessed" with product thinness, like what Apple is doing to their products. Even if Sony wants to & can do so, there is simply no space to implement socketed CPUs as their notebooks get thinner & thinner with each iteration.

 

Mr positive There is no business case for soldering a cpu on the board, especially when multiple cpu options are offered. It makes inventory a nightmare, not to mention service parts.

It obviously was a design tradeoff - size/weight, etc. Every millimeter counts.

 

Second that.