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GeForce GTX 660 Ti vs Radeon HD 4890 2GB

Intro

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

Compare those specs to the Radeon HD 4890 2GB, which features core speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti should be 15% faster than the Radeon HD 4890 2GB in general, because of its higher bandwidth. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 19200 (15%)

Texel Rate

The GeForce GTX 660 Ti will be quite a bit (about 156%) faster with regards to anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 62480 (156%)

Pixel Rate

The GeForce GTX 660 Ti will be a lot (about 37%) more effective at FSAA than the Radeon HD 4890 2GB, and also will be capable of handling higher resolutions better. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
Radeon HD 4890 2GB 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 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.

Specifications

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Model GeForce GTX 660 Ti Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year August 2012 Apr 2, 2009
Code Name GK104 RV790 XT
Memory 2048 MB 2048 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 max amount of data (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 660 Ti

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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