Next generation graphics cards from AMD is coming, and the first graphics circuit at 28nm has been dubbed Tahiti. Tahiti will be the top circuits that will be used in HD 7970, which specifications has leaked onto the web.

Det har länge skrivits om den nya grafikarkitekturen GCN (Graphics Core Next) från AMD, som blir deras första på åratal. Det första grafikkortet som kommer nyttja den purfärska arkitekturen heter HD 7970 vilket väntas bli företagets toppmodell med en GPU. Kretsen som driver den är Tahiti och bygger på TSMC:s senaste tillverkningsprocess på 28nm som effektivt ökar transistordensiteten tvåfaldigt mot 40nm.


Model Radeon HD 7970 Radeon HD 6970
Architecture Southern Islands Northern Islands
Node 28nm 40nm
Die size
~380mm² 389mm²
Circuit Tahiti XT Cayman XT
Transistors ~4.5 billion 2.64 billion
Radeon cores
2048 1536
GPU frequency
925 MHz 880 MHz
Memory bus
384-bit 256-bit
Memory buffer
3 GB 2 GB
Memory technology
Memory freqyency
1375 MHZz
(5500 MHz effectively)
1375 MHz
(5500 MHz effektively)
Memory bandwidth
264 GB/s 176 GB/s
ROPs 32 32
Texture units
128 96

HD 7970 that builds on the new GCN architecture sports 32 clusters with 32 execution units each. In total Tahiti and HD 7970 will sport 2048 Radeon cores, and increased the number of texture units from 96 in Cayman to 128. The number of ROPs remains the same; 32.

The memory controller has been upgraded from 256 to 384-bits with the same GDDR5 frequency. This will boost memory bandwidth with 50 percent, and it has also installed 3 GB memory. The card will consume 300W and below using one 8-pin and one 6-pin connector. The card sports four outputs; DVI, HDMI and two mini-DisplayPort.


Despite the turned up specifications AMD has reduced energy consumption when the card is idle. We see in the image above that compared to earlier generations, where HD 6970 consumes 24W at idle. HD 7970 will consume as little as 3W and below using AMD ZeroCore Power Technology, which more or less sounds like the card will turn off when not needed?

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