Indeed this is true, but so what? It's not like it always uses at least 45W. If you're not doing much, it underclocks itself to around 800MHz, I believe, and uses a very small amount of power. The TDP is just a recommendation from Intel that cooling systems should be able to dissipate that much heat to be able to use turbo effectively. If Apple were to use a lower performance cooling solution, it would just mean the CPU would turbo lower, and for less time. Still be faster than a dual
Furthermore, a quad CPU (as you can surmise from the TDPs) will get more done in much less time, and due to the power drain being only slightly higher than a dual, will use less total energy. Hence a quad should actually save battery life. The only real reason Apple may not use a quad is cost.
I see your point but unless your a Pro user the benefits are negligible. Most people with MacBook Pros could get by with low-end new MacBook Air or Macbook given how they use their computer. But, this definitely impacts Pro consumers that I do not think are the majority of MacBook Pro buyers anymore?
Previous generations underclock below max as well so for new generation with same idle usage with greater max usage equals reduced battery life for similar design chips across generations. Producing heat from energy is very inefficient so a more effective cooling system (45W vs 35W) is a more efficient energy wasting system. Better battery life comes from lower "overall" clock speed with less efficient heat dissipation when a machine is run at max. At max with turbo, quads have greater overall clock and greater TDP.
True, you may get less done over the same time period with dual but if your battery runs out then you got less done anyway with quad. I do not know the specifics about that cost benefit analysis. Plus, I suspect many users would run off the power adapter during sustained and intensive computing tasks that benefit from a quad so really even battery life considerations may be just for marketing?
Maybe this thread is really about differences in marketing strategy, horse power (PC) vs. battery consumption (Mac)?
The rumored/expected February release date is simply due to the fact that Apple very rarely release things in January. Less of an effect is that the 13" are unlikely to get quads to keep their price down, and heat management constraints, and Apple will want to release all MBPs at once. Hence after duals have been released as well.
Good point. But, it is rumoured the 13 inch will no longer have dedicated graphics (EDIT: already has only integrated; meant switch from Nvidia to Intel) so another factor is the dual core i7 2620M has a faster turbo clock rate for its integrated graphics. This would allow an i7 in the 13" as no cost for dedicated graphics. But, it would be strange for a Pro machine to not have dedicated graphics. Maybe the rumours are about the non-pro Macbook getting an iX cpu?
I'm actually happy this post exists. I keep debating whether to pull the trigger on a refurb i7 now. But I really just think I owe it to myself to see what Apple does with this next update. At the very least, a Quad at the top of the chain or as an upgrade option would be promising. I can see them sticking one at the top of the chain the way they did last year with the iMac.
Is there actually a Sandy Bridge mobile quad that would work? (based on the spreadsheets that were released listing all the SB cpu's). It seems like the lowest wattage on a mobile quad is 45watts. Can the MacBook Pro 15 and 17 do that currently, or is there something keeping a cap at 35watts?
From what I understand the slim MacBook Pro form factor limits the TDP that are usable due to heat limitations. If the unibody for the next gen is the same, I don't think you will see 45W chips in the MacBook Pros. But, that is just my opinion.
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