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GeForce 9800 GX2 vs GeForce GTX 660

Intro

The GeForce 9800 GX2 features a clock speed of 600 MHz and a GDDR3 memory frequency of 1000 MHz. It also makes use of a 256-bit bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare those specs to the GeForce GTX 660, which comes with a core clock speed of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 192-bit bus, and makes use of a 28 nm design. It is made up of 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
GeForce 9800 GX2 197 Watts
Difference: 57 Watts (41%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should in theory be a little bit superior to the GeForce 9800 GX2 overall. (explain)

GeForce GTX 660 144192 MB/sec
GeForce 9800 GX2 128000 MB/sec
Difference: 16192 (13%)

Texel Rate

The GeForce GTX 660 should be a little bit (more or less 2%) better at AF than the GeForce 9800 GX2. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce 9800 GX2 76800 Mtexels/sec
Difference: 1600 (2%)

Pixel Rate

The GeForce GTX 660 should be a lot (approximately 23%) more effective at AA than the GeForce 9800 GX2, and also should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce 9800 GX2 19200 Mpixels/sec
Difference: 4320 (23%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 660

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 9800 GX2 GeForce GTX 660
Manufacturer nVidia nVidia
Year Mar 2008 September 2012
Code Name G92 GK106
Memory 512 MB (x2) 2048 MB
Core Speed 600 MHz (x2) 980 MHz
Memory Speed 2000 MHz (x2) 6008 MHz
Power (Max TDP) 197 watts 140 watts
Bandwidth 128000 MB/sec 144192 MB/sec
Texel Rate 76800 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 128 (x2) 960
Texture Mapping Units 64 (x2) 80
Render Output Units 16 (x2) 24
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 192-bit
Fab Process 65 nm 28 nm
Transistors 754 million 2540 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 660

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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