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The ATI HD 5750 in the iMac is a mobility 5850.
- Thread starter TMRaven
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Yeah, Mobility 5870 is currently the second fastest mobility chip but 480M is only slightly faster. It has TDP of 50W while GF GTX 480M has TDP of 100W so performance per W is significantly better in 5870. I wouldn't call 480M a mobile chip as desktop 5750 has lower TDP than that
I really would liket see a 3dmark 06 tests by now with this new Imac...
My 2008 Imac had a 8800 GS which we later found out(here on MR) that it was actually a 8800 GTXm downclocked...
Do we have any articles on, rebranding GPUs through the history of the line up? we should documnent this stuff so we know better in the future, based on historical data!
My 2008 Imac had a 8800 GS which we later found out(here on MR) that it was actually a 8800 GTXm downclocked...
Do we have any articles on, rebranding GPUs through the history of the line up? we should documnent this stuff so we know better in the future, based on historical data!
The ATI HD 5750 in the iMac is most likely mobility 5830.
I'm not sure why no one has suggested the above, I thought that as soon as I saw the device ID and Mobility 58xx lookup.
That's from the HP Envy and would make sense for Apple to use them in the iMacs due to the reduced heat output especially given they are using the GDDR5 versions.
Specs of 5830:
* Engine clock speed: 500 MHz
* Processing power (single precision): 0.8 TeraFLOPS
* Polygon throughput: 500M polygons/sec
* Data fetch rate (32-bit): 80 billion fetches/sec
* Texel fill rate (bilinear filtered): 20 Gigatexels/sec
* Pixel fill rate: 8 Gigapixels/sec
* Anti-aliased pixel fill rate: 32 Gigasamples/sec
* Memory clock speed: 800 MHz DDR3/GDDR3
* Memory data rate: 1.6 Gbps DDR3/GDDR3
* Memory bandwidth: 25.6 GB/sec
* TDP: 24 Watts
I'm not sure why no one has suggested the above, I thought that as soon as I saw the device ID and Mobility 58xx lookup.
That's from the HP Envy and would make sense for Apple to use them in the iMacs due to the reduced heat output especially given they are using the GDDR5 versions.
Specs of 5830:
* Engine clock speed: 500 MHz
* Processing power (single precision): 0.8 TeraFLOPS
* Polygon throughput: 500M polygons/sec
* Data fetch rate (32-bit): 80 billion fetches/sec
* Texel fill rate (bilinear filtered): 20 Gigatexels/sec
* Pixel fill rate: 8 Gigapixels/sec
* Anti-aliased pixel fill rate: 32 Gigasamples/sec
* Memory clock speed: 800 MHz DDR3/GDDR3
* Memory data rate: 1.6 Gbps DDR3/GDDR3
* Memory bandwidth: 25.6 GB/sec
* TDP: 24 Watts
That GPU has less than half the memory bandwidth of the 4850M, they'd have to be insane to use that.
Even though not listed in the specs, technically the 5830 is able to support GDDR5 memory so Apple could have quite easily asked for it.
I did some digging in this matter and I can now pretty much confirm that it's Mobility 5850.
It cannot be mobility 5830 because it uses DDR3 and GDDR3 while the mystical 5750 in iMac uses GDDR5 (source).
As it has been confirmed, the device ID is 68A1. According to this, it's device ID for BROADWAY PRO/LP. The Broadway XT's device ID is 68B0 or 68A0
Broadway-LP = Mobility 5830
Broadway-PRO = Mobility 5850
Broadway-XT = Mobility 5870
So that leaves us with 5850 because 5830 uses different GDDR and 5870 has different device ID
It cannot be mobility 5830 because it uses DDR3 and GDDR3 while the mystical 5750 in iMac uses GDDR5 (source).
As it has been confirmed, the device ID is 68A1. According to this, it's device ID for BROADWAY PRO/LP. The Broadway XT's device ID is 68B0 or 68A0
Broadway-LP = Mobility 5830
Broadway-PRO = Mobility 5850
Broadway-XT = Mobility 5870
So that leaves us with 5850 because 5830 uses different GDDR and 5870 has different device ID
But why would they use a GPU that have around half of the memory bandwidth compared to the previous generation? I wouldn't be surprised if Apple would use a GPU with the same performance but I would be surprised if they put in a much slower one. They'll be flamed if so.
Obviously I'm hoping for a downclocked 5870 Mobility to get performance somewhere in between 5850 mobility and 5870 mobility. But I'm fine with a plain 5850 Mobility. I'll hopefully order one of these cute iMacs once we have all the specs figured out. I'm especially interested in the optional HD bay for use with a 3rd party SSD.
that puts it to rest then! well done hellhammer.
so is this a "new" card from ATi that apple has had access to first?. cant wait to see how underclocked they are!>
Damn.
I knew i shouldnt have hoped for a 5870.
Oh well.
I guess then we should see about the same speeds on the 5850 compared to the 4850.
comparison chart, although i dont know the clocks
http://service.futuremark.com/hardw...3&popularChipsetIds=569&popularChipsetIds=592
I guess now i understand why apple only mentioned the difference in gpu on the 21 inch model
So will it be good for gaming? and future proof or is it worth waiting for the next refresh?
It's not huge upgrade from 4850.
http://www.notebookcheck.net/AMD-ATI-Mobility-Radeon-HD-4850.13975.0.html
http://www.notebookcheck.net/ATI-Mobility-Radeon-HD-5850.23069.0.html
The faster GDDR and more VRAM will make a difference but we aren't talking about major refresh but it's what we expected. Next gen may not be any better so just buy now. The next big GPU refresh will be in late 2011 (Northern Islands)
Thanks! It's good to have one post summarizing everything because this will be asked several times in future.
Mobility 5850 is what we expected and because it comes with 1GB of GDDR5, it's very pleasant update. It's much cooler than Mobility 4850 so people who game can easily overclock it under Windows to match or overtake Mobility 5870.
What about southern islands gpu's (october 2010).
That + sandy bridge would be awesome. Allthough i have no idea if there is going to be a year to next imac refresh or if it will happen shortly after sandy bridge release
Souther Islands will be an update but the GPUs are still based on Evergreen cores. The uncore will see some major updates though and thus we will see wider memory bus widths etc. I wouldn't expect it to be a major increase but who knows. It will anyway take +6 months till next iMac update so IMO waiting would be useless. There will always be something better and faster.
Awww man. From the link provided some of the FPS #s on some games are actually better from the 4850 !
