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GeForce GTX 660 Ti vs Radeon HD 4890 1GB

Intro

The GeForce GTX 660 Ti makes use of a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this specific model. It features 1344 SPUs along with 112 TAUs and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 4890 1GB, which features clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. 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 Ti 150 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be a bit superior to the Radeon HD 4890 1GB overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 19200 (15%)

Texel Rate

The GeForce GTX 660 Ti should be quite a bit (about 156%) more effective at texture filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 62480 (156%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 660 Ti is the winner, by a large margin. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 5960 (37%)

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 Ti

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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 Ti Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year August 2012 Apr 2, 2009
Code Name GK104 RV790 XT
Memory 2048 MB 1024 MB
Core Speed 915 MHz 1000 MHz
Memory Speed 6000 MHz 3900 MHz
Power (Max TDP) 150 watts 190 watts
Bandwidth 144000 MB/sec 124800 MB/sec
Texel Rate 102480 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1344 800(160x5)
Texture Mapping Units 112 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 3540 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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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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