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GeForce 9800 GX2 vs GeForce GTX 660

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has clocked the core speed at 600 MHz. The GDDR3 RAM runs at a frequency of 1000 MHz on this model. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

Compare that to the GeForce GTX 660, which has core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 960 SPUs along with 80 Texture Address Units and 24 Rasterization Operator 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

In theory, the GeForce GTX 660 is 13% faster than the GeForce 9800 GX2 in general, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 660 will be a small bit (about 2%) more effective 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

If running with a high resolution is important to you, then the GeForce GTX 660 is a better choice, by far. (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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the 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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