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GeForce GTX 660 Ti vs Radeon HD 4890 1GB

Intro

The GeForce GTX 660 Ti features a GPU core clock speed of 915 MHz, and the 2048 MB of GDDR5 RAM runs at 1500 MHz through a 192-bit bus. It also is comprised of 1344 Stream Processors, 112 Texture Address Units, and 24 ROPs.

Compare all that to the Radeon HD 4890 1GB, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also uses 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 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 1GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

The GeForce GTX 660 Ti, in theory, should perform just a bit faster than the Radeon HD 4890 1GB in general. (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 a lot (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

The GeForce GTX 660 Ti should be much (more or less 37%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 1GB, and also able to handle higher screen resolutions without slowing down too much. (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: Bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per 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 better 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 one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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