Originally Posted by tipoo
Is the i7 in the 15 inch MBP faster than the i5 in the 21 inch iMac? Or are the laptop/desktop chips rated differently?
The 2.2GHz i7 really seems to hold up well against the iMac's desktop chips:
Geekbench (Cinebench R11) scores:
iMac 21" 2.5GHz i5 quad = 7000 (4.15)
Macbook Pro 2.00GHz i7 = 8800 (4.6)
iMac 27" 3.1GHz i5 quad = 8700 (5.15)
Macbook Pro 2.20GHz i7 = 10200 (5.30)
iMac 21" 2.8GHz i7 quad = 10800 (5.74)
iMac 27" 3.4GHz i7 quad = 12000 (6.88)
A couple of the numbers will be off as they are based on a range of scores but that seems to be roughly where they are coming in and they are sorted by the Cinebench scores, which actually indicate a real-world use as it renders a 3D image.
The 2.8GHz i7 in the BTO 21.5" iMac seems to be a pretty good value chip. This is a 65W chip. If you are into rendering or encoding, you'd be better off with the 21" with the i7 upgrade, which isn't available in the entry 27". Perhaps they are offsetting the cost of the screen with the CPU here. Pretty smart as hardly anyone would care about i5/i7, they still go by GHz numbers.
Originally Posted by Leppo
So the 'M' in 'AMD Radeon HD 6750M' means it's the mobile version of the chip, correct? How does that compare these days?
It used to be that the iMac was mostly if not entirely made up of mobile components, but it seems like they've been sneaking in desktop parts of a while.
Yeah the iMacs use desktop CPUs, they maybe always have, I'm not sure but it seems mobile GPUs. Even the ones previously were mobile ones but not labelled as such. Makes sense as I don't think they could get a standard GPU in that chassis.
In terms of performance, the 6750M is quite powerful and performs close to a desktop 5750. This is around 1/3 of the highest end desktop GPUs but some of them shove two GPUs in there.
The 6970M in the highest iMac is double the 6750M so should be comparable to a desktop 5870, which is one of the highest-end single cards you get.
Originally Posted by PXT
Any relevance to thunderbolt here? I.e., plug in a 10GB dongle and see your iMac speed up?
"Apple has confirmed to Macworld that the new iMacs can be used as external displays via their Thunderbolt ports. However, to do so, you’ll need a Thunderbolt-equipped Mac, such as one of the early 2011 models of MacBook Pros."
I'd expect that since the Thunderbolt ports externalise a PCI connection, you should be able to hook up an SSD outside the machine to use as a boot drive, which gives a better boost than a Vista pen drive, which is just a caching feature.
I'd also expect it to allow manufacturers to built a video input device. Given the low latency, it's probably something companies like Elgato should look into.
It's nice to see them using multiple Thunderbolt ports. That puts to bed the assumption that this would be a single port technology.