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 06 June 2006
 NVIDIA
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 Technology Report
 Dr. Adrian Wong
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NVIDIA GeForce 7950 GX2 Technology Report
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The Reference Card

Here's what the NVIDIA reference card looks like. Surprisingly, it has a rather small aluminium cooler but that may well have a good reason for it.

To ensure that the GeForce 7950 GX2 does not displace the GeForce 7900 GTX SLI as the ultimate graphics solution for hardware enthusiasts, NVIDIA kept the GeForce 7950 GX2's GPU clock speeds low. But smart users may ruin their plans by overclocking the GPUs. To prevent that, it makes sense for NVIDIA to equip the GeForce 7950 GX2 with puny little coolers.

Front of the card

Back of the card

There's no sign of any memory chips at the back, so evidently all memory chips were placed in the front. If you take a look at the picture on the right, you can see the GeForce 7950 GX2's external bracket.

Although it uses only a single PCIe slot, it still takes the space of two slots. The upper part of the bracket houses a single HDTV-out connector and two DVI ports while the lower part has exhaust vents for the cooler.

Here, we have pictures of the new NVIDIA GeForce 7950 GX2 installed in a PCIe motherboard. The first picture shows the single GeForce 7950 GX2 card while the second picture shows two GeForce 7950 GX2 cards in SLI.

Single card

Two cards in SLI

Because each GeForce 7950 GX2 has two GPUs, running two of these cards essentially gives you a Quad SLI solution. However, because of the lower clock speeds, you still won't be able to achieve the same performance as a real GeForce 7900 GTX Quad SLI solution.

 

GeForce 7900 Series Feature Comparison

Here's a comparison of key features between the GeForce 7950 GX2 with its recently-released brothers - the GeForce 7900 GTX and the GeForce 7900 GT cards.

 
GeForce 7950 GX2
GeForce 7900 GTX
GeForce 7900 GT
Architecture
G71
G71
G71
Process Technology
90 nm
90 nm
90 nm
Number of Transistors
278 Million x 2
278 Million
278 Million
Die Size
196 mm2
196 mm2
196 mm2
Pixel Pipelines
48 Pixel Pipelines
24 Pixel Pipelines
24 Pixel Pipelines
ROPs
32 ROPs
- 32 colour, 32 blend
16 ROPs
- 16 colour, 16 blend
16 ROPs
- 16 colour, 16 blend
Core Clock
500 MHz
650 MHz
450 MHz
Fillrate
24.0 Gigapixels / sec.
15.6 Gigapixels / sec.
10.8 Gigapixels / sec.
Memory Interface
Two 4-way 64-bits memory interface
(512-bits total)
4-way 64-bits memory interface
(256-bits total)
4-way 64-bits memory interface
(256-bits total)
Memory Buffer
1024 MB GDDR3
512 MB GDDR3
256 MB GDDR3
Memory Clock
600 MHz
1.2 GHz DDR
800 MHz
1.6 GHz DDR
660 MHz
1.32 GHz DDR
Memory Bandwidth
76.8 GB/s
51.2 GB/s
42.2 GB/s
Vertex Units
16 Vertex Units
8 Vertex Units
8 Vertex Units
Vertex Clock
500 MHz
700 MHz
470 MHz
Vertex Output
2000 million vertices / sec.
1400 million vertices / sec.
940 million vertices / sec.
Power Consumption
143 W
120 W
82 W
Shader Model Version
SM 3.0
SM 3.0
SM 3.0
NVIDIA IntelliSample Technology
4.0
4.0
4.0
NVIDIA SLI Technology
Yes
Yes
Yes
NVIDIA Quad SLI Technology
Yes
Yes
No
DVI Support
Two dual-linked DVI,
both integrated into the GPU
Two dual-linked DVI,
both integrated into the GPU
Two dual-linked DVI,
both integrated into the GPU

As you can see, all three cards are VERY similar. That's because they are based on the same GPU. The only differences between the new GeForce 7950 GX2 and its brethren are its clock speeds and the fact that it comes with two GPUs. Otherwise, they are essentially the same.



 

 
   
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