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GeForce GTX 660 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 660 has a GPU core clock speed of 980 MHz, and the 2048 MB of GDDR5 memory is set to run at 1502 MHz through a 192-bit bus. It also is made up of 960 Stream Processors, 80 Texture Address Units, and 24 ROPs.

Compare all of that to the Radeon HD 4850 X2 512MB, which features GPU core speed of 625 MHz, and 512 MB of GDDR3 RAM running at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation 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

As far as performance goes, the GeForce GTX 660 should theoretically be a bit better than the Radeon HD 4850 X2 512MB overall. (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%) more effective at anisotropic filtering 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

The GeForce GTX 660 is a bit (about 18%) more effective at full screen anti-aliasing than the Radeon HD 4850 X2 512MB, and also will be capable of handling higher screen resolutions without slowing down too much. (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 maximum amount of information (in units of MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum 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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