Source: Radeon HD 7900 series gets new architecture and XDR2 Rambus memory?

Radeon HD 7000 will like the current 6000 family launch in steps and with different base architectures. If we are to believe the latest information that is said to come from AMD's leaked roadmap the graphics card marker is aiming for a first launch in Q4 2011. Then it will be the latest VLIW4 architecture (Very Long Instruction Word) that is on the menu and it will most likely have the same base as the Radeon HD 6900 series. An archtiecture that will be more efficient than VLIW5 that was used by other Radeon HD 6000 cards.

AMD is planning four different GPUs based on the 28nm version of the VLIW4 architecture and use them in three different series, Radeon HD 7800, HD 7600 and HD 7500. The four GPUs will be equipped with 768 to 1536 Radeon cores (stream processors) and GDDR5 memory in high speeds.

Graphics card Radeon HD 7870 Radeon HD 7850 Radeon HD 7670 Radeon HD 7570
Node TSMC 28nm HPL TSMC 28nm HPL TSMC 28nm HPL TSMC 28nm HPL
Architecture VLIW4 VLIW4 VLIW4 VLIW4
GPU Thames XT Thames Pro Lombok XT Lombok Pro
Radeon cluster 24 22 12 12
Radeon cores 1536 1408 768 768
GPU frequency 950 MHz 850 MHz 900 MHz 750 MHz
Texture units
96 88 48 48
ROPs 32 32 16 16
Graphics memory
2GB GDDR5 2GB GDDR5 1GB GDDR5 1GB GDDR5
Memory frequency
5800 MHz 5200 MHz 5000 MHz 4000 MHz
Memory interface
256 bit 256 bit 128 bit 128 bit
Memory bandwidth
186 GB/s 166 GB/s 80 GB/s 64 GB/s
Power consumption
120 watt 90 watt 60 watt 50 watt


Graphics card Radeon HD 7970 Radeon HD 7950 Radeon HD 6970
Node TSMC 28nm HP TSMC 28nm HP TSMC 40nm
Architecture GCN GCN VLIW4
GPU Tahiti XT Tahiti Pro Cayman XT
Radeon cluster 32 30 24
Radeon cores 2048 1920 1536
GPU frequency
1000 MHz 900 MHz 880 MHz
Texture units
128 120 96
ROPs 64 64 32
Graphics memory
2GB XDR2 2GB XDR2 2GB GDDR5
Memory frequency
8000 MHz 7200 MHz 5500 MHz
Memory interface
256 bit 256 bit 256 bit
Memory bandwidth
256 GB/s 230 GB/s 176 GB/s
Power consumption
190 watt 150 watt 250 watt