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GeForce GTX 660 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has set the core frequency at 980 MHz. The GDDR5 memory is set to run at a frequency of 1502 MHz on this specific model. It features 960 SPUs along with 80 Texture Address Units and 24 ROPs.

Compare those specs to the Radeon HD 4850 X2 512MB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 RAM works at a frequency of 993 MHz on this model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 110 Watts (79%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 is 13% quicker than the Radeon HD 4850 X2 512MB overall, because of its higher bandwidth. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 17088 (13%)

Texel Rate

The GeForce GTX 660 will be much (more or less 57%) faster with regards to AF than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 28400 (57%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 660 is superior to the Radeon HD 4850 X2 512MB, though not by far. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 3520 (18%)

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 GTX 660

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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 GTX 660 Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year September 2012 Nov 7, 2008
Code Name GK106 R700
Memory 2048 MB 512 MB (x2)
Core Speed 980 MHz 625 MHz (x2)
Memory Speed 6008 MHz 1986 MHz (x2)
Power (Max TDP) 140 watts 250 watts
Bandwidth 144192 MB/sec 127104 MB/sec
Texel Rate 78400 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 960 800(160x5) (x2)
Texture Mapping Units 80 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 2540 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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