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GeForce GTX 660 Ti vs Radeon HD 4890 1GB

Intro

The GeForce GTX 660 Ti has a core 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 made up of 1344 SPUs, 112 Texture Address Units, and 24 ROPs.

Compare those specifications to the Radeon HD 4890 1GB, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also is made up 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 1GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be a small bit better than 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 is much (approximately 156%) better at anisotropic 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 is much (approximately 37%) more effective at anti-aliasing than the Radeon HD 4890 1GB, and also will be capable of handling higher screen resolutions without losing too much performance. (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 maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it must 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach 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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