Specifications

	Mars/2DI/4GD3	GeForce GTX 295	GeForce GTX 285	GeForce GTX 275
Chip	2 x G200	G200	G200	G200
Process	55 nm	55 nm	55 nm	55 nm
Transistors	ca. 2.8 Mrd	2 x 1.4 Mrd.	ca.1.4 Mrd.	ca.1.4 Mrd.
GPU clock	648 MHz	576 MHz	648 MHz	633 MHz
Shader (MADD)	2 x 240 unified	2 x 240 unified	240 unified	240 unified
Shader clock	1476 MHz	1242 MHz	1476 MHz	1404 MHz
Memory	2 x 2 GByte GDDR3	2 x 896 MB	1024 MB GDDR3	896 MB GDDR3
Memory clock	1200 MHz	999 MHz	1142 MHz	1134 MHz
Memory interface	2 x 512 Bit	2 x 448 Bit	512 Bit	448 Bit
Memory bandwidth	2 x 158'976 MB/s	223'800 MB/s	158'976 MB/s	127'008 MB/s
ROPs	2 x 32	2 x 32	32	28
TMUs	2 x 80	2 x 80	80	80
TAUs	2 x 80	2 x 80	80	80
Shader model	SM4	SM4	SM 4	SM 4
Max TDP	> 250 Watt	289 Watt	183 Watt	219 Watt

Cooling

Designing a card which is based on two GTX 285 GPUs, but only comes with one cooling block, one of the biggest problems you'll end up with, is an adequate cooling solution. Compared to the GTX 295 ASUS overworked the GTX 295 cooler completely. Now you get eight heatpipes. Two copper base plates transport the dissipation power directly to the heatpipes from where it goes to the numerous fins. Paired up with a powerful radial fan ASUS obviously seems to be able to cope with the immense TDP of those two GTX 285 GPUs.

Dissipation power

If we look at the dissipation power these times we can only speculate. If ASUS really put two GTX 285 GPUs into one PCI-E slot their cooler has to be able to transport more than 350 Watts of heat to the environment. Probably ASUS also found different ways to reduce the TDP (Thermal Dissipation Power) of the whole card. What would have been relatively easy is reducing the shader clock. Therefore you would have gotten two adavantages: the card is more generous with temperatures and the dissipation power can be reduced. But ASUS really set the target to put two fully fledged GTX 285 GPUs into one PCI-E slot.



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