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AMD Pitcairn Specifications Surface

btarunr

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#1
The launch of AMD's Radeon 7800 series is on course for March, as AMD wants to complete the launches of the entire Radeon 7000 series before NVIDIA even has its first GPU out. Radeon HD 7800 will be designed to occupy key price points in the sub-$300 market segment, where it strikes price-performance sweetspots for gamers. Central to this series is a new 28 nm GPU, codenamed "Pitcairn", from which will be derived three SKUs: the Radeon HD 7870, Radeon HD 7850 2 GB, and Radeon HD 7850 1 GB. The specifications look like this:

Radeon HD 7850
  • 20 Graphics CoreNext Compute Units, 1280 stream processors
  • 80 TMUs, 24 ROPs (de-linked from the memory bus, of course)
  • 256-bit wide GDDR5 memory interface, 2 GB and 1 GB variants
  • Clock speeds of 900 MHz core, 1250 MHz (5.00 GHz effective) memory
Radeon HD 7870 specifications follow.

Radeon HD 7870
  • 22 GCN CUs, 1408 stream processors
  • 88 TMUs, 24 ROPs (de-linked from memory bus)
  • 256-bit wide GDDR5 memory interface, 2 GB
  • Clock speeds of 950 MHz core, 1375 MHz (5.50 GHz effective) memory
Some time after March, AMD will likely launch a "Radeon HD 7890" SKU, which will be based on the Tahiti GPU.

Source: Expreview
 
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#2
Seems they are trying to corner the market big time. What purpose would the Radeon HD 7890 have? We've already had the HD 4890 which was the last GPU released shortly before Evergreen's HD 5000 series.
 
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#3
these are supposed to be the replacement of HD 6800 yes? (the supposed to be midrange parts), HD 7700 being the mainstream and the HD 7900 series high end.
 
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#4
It looks like 7870 will replace 6970 and 7850 replace the 6950. The new architecture will maintain the performance of previous generations with fewer shader units.
 

dieterd

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#6
it will be the same story no matter what it is called 79xx or 77xx - price/preformance will suck bad vs HD 69xx.
 
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#7
It looks like 7870 will replace 6970 and 7850 replace the 6950. The new architecture will maintain the performance of previous generations with fewer shader units.
At best this will be the outcome. Same price probably for the same performance as last generation.
 
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#9
If this kind of news find it's way to techpowerup it only means that w1zz has approved with he's samples.
 
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#10
At best this will be the outcome. Same price probably for the same performance as last generation.
Let's hope that with the release of Kepler prices will fall.
 

crazyeyesreaper

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#11
makes perfect sense

Juniper was half of Cypress

cape verde is half of Pitcairn

makes perfect sense,

Radeon HD 7770

All CUs enabled, 640 stream processors
1 GB GDDR5 memory
40 TMUs, 16 ROPs
1000 MHz core clock-speed
1125 MHz (actual), 4500 MHz (effective) memory clock-speed


7770 to 7850

640 shaders to 1280 shaders
1GB to 2GB
40 TMUs to 80 TMUs
16 ROPs to 24 ROPs

7770 to 7870
640 shaders to 1408
1GB to 2GB
40 TMUs to 88 TMUs
16 ROPs to 24Rops

if you look at the 7970

7770 to 7970
640 to 2048
1GB to 3GB
40 TMUs to 128TMUs
16 ROPs to 32 ROPs

depending on which card in the series you look at

essentially Cape Verde is Doubled or Tripled to meet the next performance bracket neccesary,

and we can already see the performance 7800 series offers just look at 7770 crossfire, same situation as 5770 crossfire was to 5870 essentially, it makes sense considering AMDs idea to design a middle of the road gpu they can scale up and down to meet market demands

AMD as doubled and tripled shader counts from CapeVerde to each segment
ROPs get increased by 8

so we have 640 shaders 16 rops 40 tmus
next step up 1280 24 80
next step above that 1920 32 120, gives a rough idea of what AMDs idea was with GCN
7770 = entry 7770 xfire = 7870 and 7970 is of course 7970

Notice the Performance jump 40% then 30% roughly what we should expect when the value of diminishing returns are taken into account,
 
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#12
I wonder in what program can I make so beautiful diagram or graph like in the post above (by crazyeyesreaper).
 
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#13
These will probably be the cards I'm most likely to get. Again, there probably won't be anything wrong with the cards themselves, let's just hope AMD can figure out how to price them properly and not pull off what they did with Cape Verde.
 
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#14

brandonwh64

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#20
I'm serious. Every tech blog has beautiful bars (or charts) in articles and reviews. I'm sure these pictures are generated automatically, but the key question - what software was used.
He is serious LOL
 
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#22
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#24
If HD 7870 outperforms GTX 570, then AMD might troll us with $349. If it doesn't outperform GTX 570, then $299.
I think it will not outperform a GTX570 and it will be 350$. But hey, you can overclock like hell, draws far less power etc. etc.
 
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#25
If HD 7870 outperforms GTX 570, then AMD might troll us with $349. If it doesn't outperform GTX 570, then $299.



A beautiful set of islands.
meh... not trolling exactly.. just "healthy greed" so typically seen... :D if they can of course (I think there are enough fanbois out in the wilderness to be hunted) :nutkick: