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coreymlong

macrumors newbie
Original poster
Nov 30, 2012
19
0
Portland, OR
I plan to upgrade to 32GB RAM. For Photoshop, Video Editing, Music Editing, and every day use, which is best?

27-inch iMac - $1924.00
2.9GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz
8GB 1600MHz DDR3 SDRAM - 2x4GB
1TB Fusion Drive
NVIDIA GeForce GTX 660M 512MB GDDR5

27-inch iMac - $2124
3.2GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz
8GB 1600MHz DDR3 SDRAM - 2x4GB
1TB Fusion Drive
NVIDIA GeForce GTX 675MX 1GB GDDR5

27-inch iMac - $2304.00
3.4GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz
8GB 1600MHz DDR3 SDRAM - 2x4GB
1TB Fusion Drive
NVIDIA GeForce GTX 675MX 1GB GDDR5
 

coreymlong

macrumors newbie
Original poster
Nov 30, 2012
19
0
Portland, OR
if you are already planning on 32gb of ram, then I guess go the whole hog & spend the 280 bucks extra to have one heck of a kick ass' mac!

But wouldn't the $1924 model suffice for what I'm doing? I'm just wondering if the extra processor speed would really make a difference or if the Fusion Drive and 32GB RAM will make enough of a difference?
 

iPad2lover

macrumors newbie
Oct 18, 2011
11
0
if you are already planning on 32gb of ram, then I guess go the whole hog & spend the 280 bucks extra to have one heck of a kick ass' mac!

Yes, and you won't have to buy another one for a very long time!! Unless, you really want to.
 

talmy

macrumors 601
Oct 26, 2009
4,725
332
Oregon
I plan to upgrade to 32GB RAM. For Photoshop, Video Editing, Music Editing, and every day use, which is best?

The i7 choice is only worth it for applications that can use the additional 4 virtual ("hyper threaded") cores. I've only found a real time savings with Handbrake. Photoshop won't use it. iMovie doesn't but Final Cut would. GarageBand won't and I don't know about Logic. The i5 upgrade would give you at most a 10% speed boost at at a minimum none (because of TurboBoost).

Frankly the base model would be fine. Save your money for other things. And even though RAM is pretty inexpensive (except for the 32GB upgrade), you are unlikely to use more than 8, so try running your normal application load first to see what you are using. Look at the "Page Outs". Every 100MB represents second lost to swapping.
 

coreymlong

macrumors newbie
Original poster
Nov 30, 2012
19
0
Portland, OR
The i7 choice is only worth it for applications that can use the additional 4 virtual ("hyper threaded") cores. I've only found a real time savings with Handbrake. Photoshop won't use it. iMovie doesn't but Final Cut would. GarageBand won't and I don't know about Logic. The i5 upgrade would give you at most a 10% speed boost at at a minimum none (because of TurboBoost).

Frankly the base model would be fine. Save your money for other things. And even though RAM is pretty inexpensive (except for the 32GB upgrade), you are unlikely to use more than 8, so try running your normal application load first to see what you are using. Look at the "Page Outs". Every 100MB represents second lost to swapping.

That's what I was figuring. I wouldn't use it for gaming so the graphics upgrade doesn't mean much to me. I might by a 16GB pack of RAM so that it runs at 24GB which would be perfectly fine. I think the fusion drive will give me a big speed increase as well.
 

mrschultz

macrumors newbie
Dec 9, 2012
1
0
32gb ram

Hey guys, I found 32gb ram way cheaper online. Is the RAM from Apple the only ram I can use in the imac? anyone know how many pin the ram is on the imac 27" models ?

the price difference where I'm from is $600 (from apple), or $160 (corsair - found online).

thanks!!
 

bunger

macrumors 6502
Mar 1, 2007
468
6
The i7 choice is only worth it for applications that can use the additional 4 virtual ("hyper threaded") cores. I've only found a real time savings with Handbrake. Photoshop won't use it. iMovie doesn't but Final Cut would. GarageBand won't and I don't know about Logic. The i5 upgrade would give you at most a 10% speed boost at at a minimum none (because of TurboBoost).

I would imagine that future versions of these apps could add support for hyper threading.....
 

lixuelai

macrumors 6502a
Oct 29, 2008
957
326
I would imagine that future versions of these apps could add support for hyper threading.....

HyperThreading has been around for over a decade. If software is going to take advantage of it then it would have already.
 

talmy

macrumors 601
Oct 26, 2009
4,725
332
Oregon
I would imagine that future versions of these apps could add support for hyper threading.....

There is no way to explicitly support hyperthreading. It's a matter of how many execution threads an application can keep active at one time. Most applications have only a single execution thread. All of the processors are quad core and will run four threads simultaneously. Hyperthreading will allow eight threads, although the additional 4 are only about 30% as fast. Very few applications will use a quad core processor fully.

Most applications aren't really amenable for multiple threads or require so little CPU resources that recoding for multiple threads is not worth the effort.

You can use activity monitor to see how much CPU an application is using. In the process display, 100% CPU represents full use of a single core while the CPU display at the bottom of the window is scaled so that 100% means every resource is 100% utilized (with a quad-core hyperthreaded CPU, 12.5% would be one core fully utilized).
 
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