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GeForce GTX 660 Ti vs Radeon HD 4890 2GB

Intro

The GeForce GTX 660 Ti has a clock speed of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 192-bit bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 Texture Address Units, and 24 Raster Operation Units.

Compare those specs to the Radeon HD 4890 2GB, which features a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also is comprised of 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 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, due to its higher data rate. (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 is much (about 156%) better at texture 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 is quite a bit (about 37%) better at full screen anti-aliasing than the Radeon HD 4890 2GB, and should 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 largest amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - 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 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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