Technical data / specifications

The ASUS HD7770 DirectCU Top is a Radeon HD 7770 graphics card, which is based partially on AMDs reference design. That part that has been entirely built according to AMDs specifications concerns the PCB. There nothing has been touched by ASUS. What ASUS did themselves, that's the cooler. They decided to make use of a model that is more silent when the fans are at full speed. Like this they gave away some of the overclocking potential of this card. Furthermore the card also comes with a factory overclocking. 

A closer look at the clock speeds reveals that the GPU has been overclocked significantly. The GPU operates at 1'120 MHz and the memory at 2'300 MHz (effective 4'600 MHz). Furthermore there is a total of 1'024 Megabyte of GDDR5 memory that is connected to the GPU via a 128 Bit memory interface. Therefore the card offers 73'600 Megabyte per second of memory bandwidth.

The GPU itself consists of 1.5 billion transistors and it is being manufactured at TSMC using their latest 28 nanometer process technology. As a midrange model the Radeon HD 7770 ships with 40 TMUs, 40 TAUs and 16 ROPs. Overall there are 640 shader units.

	ASUS HD7700 DirectCU Top	Radeon HD 7770	Radeon HD 7750	Radeon HD 6770	Radeon HD 6750
Chip	Cape Verde	Cape Verde	Cape Verde	Juniper	Juniper
Process	28 nm	28 nm	28 nm	40 nm	40 nm
Transistors	1.5 billion	1.5 billion	1.5 billion	1.04 billion	1.04 billion
GPU clock	1'120 MHz	1'000 MHz	800 MHz	850 MHz	700 MHz
Shader clock	1'120 MHz	1'000 MHz	800 MHz	850 MHz	700 MHz
Memory	1'024 MB GDDR5	1'024 MB GDDR5	1'024 MB GDDR5	1'024 MB GDDR5	1'024 MB GDDR5
Memory clock	2'300 MHz	2'250 MHz	2'250 MHz	2'400 MHz	2'300 MHz
Memory interface	128 Bit	128 Bit	128 Bit	128 Bit	128 Bit
Memory bandwidth	73'600 MB/s	72'000 MB/s	72'000 MB/s	76'800 MB/s	73'600 MB/s
TMUs	40	40	32	40	36
TAUs	40	40	32	40	36
Shader Cores	640 (1D)	640 (1D)	512 (1D)	160 (5D)	144 (4D)
ROPs	16 ROP	16 ROP	16 ROP	16 ROP	16 ROP
Shader model	SM 5.1	SM 5.1	SM 5.1	SM 5	SM 5
Maximum board power	80 Watt	80 Watt	55 Watt	108 Watt	86 Watt

Page 1 - Introduction	Page 8 - Stone Giant
Page 2 - Technical Data / Specifications	Page 9 - World in Conflict
Page 3 - Preview / Delivery	Page 10 - Resident Evil 5
Page 4 - Testing conditions	Page 11 - Call of Juarez
Page 5 - 3D Mark 11	Page 12 - Far Cry 2
Page 6 - 3D Mark Vantage	Page 13 - Overclocking
Page 7 - Unigine Heaven	Page 14 - Conclusion

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