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GeForce GTX 660 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory is set to run at a frequency of 1502 MHz on this specific card. It features 960 SPUs as well as 80 TAUs and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 4890 2GB, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 50 Watts (36%)

Memory Bandwidth

The GeForce GTX 660 should theoretically be just a bit faster than the Radeon HD 4890 2GB in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 19392 (16%)

Texel Rate

The GeForce GTX 660 should be much (more or less 96%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 38400 (96%)

Pixel Rate

The GeForce GTX 660 will be much (more or less 47%) more effective at anti-aliasing than the Radeon HD 4890 2GB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 7520 (47%)

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.

Price Comparison

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GeForce GTX 660

Amazon.com

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Radeon HD 4890 2GB

Amazon.com

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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 4890 2GB
Manufacturer nVidia AMD
Year September 2012 Apr 2, 2009
Code Name GK106 RV790 XT
Memory 2048 MB 2048 MB
Core Speed 980 MHz 1000 MHz
Memory Speed 6008 MHz 3900 MHz
Power (Max TDP) 140 watts 190 watts
Bandwidth 144192 MB/sec 124800 MB/sec
Texel Rate 78400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 960 800(160x5)
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 2540 million 959 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core 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 amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's 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 of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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