Monday, February 20th 2012
AMD Pitcairn Specifications Surface
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
Radeon HD 7870
Source:
Expreview
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
- 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
48 Comments on AMD Pitcairn Specifications Surface
No bang for the buck in this generation of AMD...
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,
tpucdn.com/reviews/HIS/HD_7750_7770_CrossFire/images/perfrel_1920.gif
Thanks a lot
www.techpowerup.com/forums/forumdisplay.php?f=5
On topic. WTF is a Pitcairn?