Well, it’s happened again – Apple’s online store went down briefly this morning, meaning that the secretive company was stocking its virtual shelves with new product. As expected, when the curtain was pulled back, we all had new iMacs staring us right in the face, and they brought with them the customary slew of incremental upgrades over last year’s models. If you were paying attention when Apple refreshed the MacBook Pro earlier this year, a lot of this is going to be familiar to you.

There were two major improvements in the MacBook Pros that made most of the headlines: an upgrade to Intel’s new Sandy Bridge processors, and the introduction of the new Thunderbolt port in place of the former Mini DisplayPort. Formerly code-named Light Peak, this Intel-developed port enables two-way 10Gbps transfer speeds between a variety of devices while also maintaining compatibility with existing Mini DisplayPort dongles and cables.

To see more about the particulars of Thunderbolt, you’ll definitely want to read the extensive write-up we did about the technology when it launched in the 2011 MacBook Pros – everything written there is true of the port in the new iMacs. You’ll definitely see Thunderbolt crop up in other Macs as the year goes on, and you may start to see it pop up in PCs as well depending on how quickly people jump on the bandwagon. Until then, use of the port in peripherals is and will probably continue to be rare, so the more immediate concern for us is the hardware upgrades in the new Macs.

2011 iMac Lineup
  21.5-inch (low-end) 21.5-inch (high-end) 27-inch (low-end) 27-inch (high-end)
Dimensions (inches) 17.75 H x 20.8 W x 7.42 D 17.75 H x 20.8 W x 7.42 D 20.4 H x 25.6 W x 8.15 D 20.4 H x 25.6 W x 8.15 D
Weight 20.5 lbs (9.3 kg) 20.5 lbs (9.3 kg) 30.5 lbs (13.8 kg) 30.5 lbs (13.8 kg)
CPU 2.5 GHz quad-core Core i5 2.7 GHz quad-core Core i5 2.7 GHz quad-core Core i5 3.1 GHz quad-core Core i5
GPU AMD Radeon HD 6750M (512MB) AMD Radeon HD 6770M (512MB) AMD Radeon HD 6770M (512MB) AMD Radeon HD 6970M (1GB)
RAM 4GB 1333MHz DDR3 (16GB max) 4GB 1333MHz DDR3 (16GB max) 4GB 1333MHz DDR3 (16GB max) 4GB 1333MHz DDR3 (16GB max)
HDD 500GB 7200 RPM 1TB 7200 RPM 1TB 7200 RPM 1TB 7200 RPM
Display Resolution 1920x1080 1920x1080 2560x1440 2560x1440
Ports Gigabit LAN, Firewire 800, Thunderbolt, 4x USB 2.0, SDHC slot, separate audio in/out jacks Gigabit LAN, Firewire 800, Thunderbolt, 4x USB 2.0, SDHC slot, separate audio in/out jacks Gigabit LAN, Firewire 800, 2x Thunderbolt, 4x USB 2.0, SDHC slot, separate audio in/out jacks Gigabit LAN, Firewire 800, 2x Thunderbolt, 4x USB 2.0, SDHC slot, separate audio in/out jacks
Price $1,199 $1,499 $1,699 $1,999

All iMacs now come packing quad-core Sandy Bridge processors, dedicated graphics with 512MB or 1GB of memory (the high-end 27” model can also be configured with a 2GB 6970M), Thunderbolt (one port in the 21.5” model, two in the 27” model), and an HD Facetime camera (which supplants the previous generation’s iSight camera, making the white MacBook Apple’s last product to carry the iSight branding). Update: Reader emails have alerted me to an iFixit teardown of the new iMac, which reveals that they're shipping with the new Intel Z68 chipset. We wrote a little about Z68 earlier this year - no word on whether OS X supports or plans to support any of its unique features at this point.

It's too bad to see that all iMac models across the board still come with 4GB RAM installed by default, and Apple's upgrade prices for memory remain ridiculous (bumping it up to 8GB across two 4GB DIMMS costs $200; market value for 8GB DDR3 kits is about $80). At least these iMacs continue to offer four RAM slots, versus the two slots on older iMacs - if 4GB is not a suitable amount for you, adding another 4-8 GB is easy and relatively inexpensive if you don't pay Apple's prices.

All of these internals are packed into a case that’s virtually identical to the aluminum unibody iMac design introduced in 2009, which itself was a gentle retooling of the aluminum iMac introduced in August of 2007. The point being, this refresh is all about the hardware inside: you’re not getting anything drastically thinner or lighter, and if you’ve seen an iMac in the last three or four years, you should have a pretty good idea of what you’re buying.

CPUs: The iMac Gets Sandy Bridged

Prior to the MacBook Pro refresh (and excluding the Mac Pro), the iMac was Apple’s only product line to transition completely away from Core 2 Duo processors to newer Nehalem-based Core i3, i5, and i7 processors – the white MacBook, the Mac Mini, and the MacBook Air lines continue to use the Core 2 Duo along with nVidia chipsets to save space and energy, and to get around using Intel’s previous-generation integrated graphics processor.

So the iMac wasn’t as far behind in CPU architecture as some of Apple’s other products, but the switch to quad-core processors across all models and price levels should give new customers a healthy speed bump over the previous generation. As we saw in our review of the Sandy Bridge MacBook Pros, Apple makes use of Intel’s Turbo Boost feature to make up for the quad core parts’ lower clock speeds relative to dual core parts in single-threaded applications.

The Sandy Bridge and Thunderbolt upgrades are more or less known quantities at this point – what impressed me most about the new iMacs was the GPU upgrade, especially in the entry-level iMac and the high-end iMac.

GPUs and Preparing for Lion
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  • Andrew.a.cunningham - Wednesday, May 4, 2011 - link

    You're right to be suspicious - it's not an Apple exclusive, but it will be awhile before other OEMs jump on the bandwagon (if they decide to). I've corrected the article.

    I also think you may be right about Thunderbolt having the potential to be another Firewire - Firewire 400/800 is, in some respects, technically superior to USB 2.0, but USB is simpler and cheaper to implement and everyone was already used to it, so it's still everywhere while Firewire ports are limited mostly to Macs, add-in cards and higher-end motherboards. Thunderbolt could be better enough than USB 3 that this doesn't happen again, but it's impossible to say at this point.
  • Zandros - Tuesday, May 3, 2011 - link

    I might be wrong, but my impression was that the GPUs in the 2010 iMacs were desktop cards, or rather mobility cards marketed with the equivalent performance desktop numbers.

    Source: http://forums.macrumors.com/showthread.php?t=97867...
  • Tamz_msc - Wednesday, May 4, 2011 - link

    They're mobile CPUs, else how could a desktop HD 5770 be made to fit inside it?Apple might have been lying with their previous spec sheets.
  • Zandros - Wednesday, May 4, 2011 - link

    Did you read the second part of my sentence?

    According to all evidence I've seen, the "5750" in the 2010 high-end iMac was in reality a mobility 5850 (i.e. a mobile card with roughly equivalent performance to the desktop 5750), when the article claims it was a mobility 5750.
  • AmdInside - Tuesday, May 3, 2011 - link

    The problem is that Thunderbolt is not backwards compatible with any technology. It will be a while before consumers adopt Thunderbolt me thinks. At least firewire had camcorders to push the technology.
  • Focher - Tuesday, May 3, 2011 - link

    Actually, that's not really true. Any PCIx based device can be switched to Thunderbolt with minimal engineering effort. DisplayPort compatible devices are obviously fine out of the box.

    At NAB this year, lots of Thunderbolt devices were demonstrated.
  • mianmian - Tuesday, May 3, 2011 - link

    For PCs, it has a big problem to use thunderbolt : the discrete graphic card.

    Since thunderbolt need to carry video signal, thunderbolt need changes to the current discrete graphic card. Before AMD and Nvidia work out the Optimus like technology for desktop, thunderbolt can hardly go to desktop PCs. Maybe we can see it goes to notebook PCs first.
  • Tros - Tuesday, May 3, 2011 - link

    I'm probably newb'ing this up, but can't video cards already do off-screen rendering, and isn't Thunderbolt a DMA interface? The video-card doesn't need to be changed at all, IMO. It's probably just the drivers that need retooling.
  • Focher - Tuesday, May 3, 2011 - link

    Thunderbolt doesn't NEED to carry a video signal. It can, but it doesn't have to. You can easily have separate discrete GPUs that never touch Thunderbolt and have no impact whatsoever on it. Or they can work together with a software driver to switch between a Thunderbolt-based display versus one running off of a discrete GPU.
  • mianmian - Tuesday, May 3, 2011 - link

    According to wiki:

    Because the PCIe bus does not carry video data, it is unclear whether a standalone PCIe card could offer a Thunderbolt port. The Intel Thunderbolt Technology Brief does not give a conclusive answer.
    Thunderbolt can be implemented on graphics cards, which have access to DisplayPort data and PCI express connectivity, or on the motherboard of new devices, such as the MacBook Pro.

    Thunderbolt without video single is unknown yet.

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