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GeForce GTX 460 2GB vs Radeon HD 4890 1GB

Intro

The GeForce GTX 460 2GB uses a 40 nm design. nVidia has clocked the core speed at 675 MHz. The GDDR5 RAM runs at a speed of 900 MHz on this specific model. It features 336 SPUs along with 56 Texture Address Units and 32 Rasterization Operator Units.

Compare all that 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 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 460 2GB 160 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 30 Watts (19%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB is 8% quicker than the GeForce GTX 460 2GB overall, because of its greater data rate. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce GTX 460 2GB 115200 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 4890 1GB will be a small bit (more or less 6%) faster with regards to texture filtering than the GeForce GTX 460 2GB. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce GTX 460 2GB 37800 Mtexels/sec
Difference: 2200 (6%)

Pixel Rate

The GeForce GTX 460 2GB will be much (approximately 35%) better at full screen anti-aliasing than the Radeon HD 4890 1GB, and also capable of handling higher resolutions better. (explain)

GeForce GTX 460 2GB 21600 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 5600 (35%)

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 460 2GB

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 460 2GB Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year July 2010 Apr 2, 2009
Code Name GF104 RV790 XT
Memory 2048 MB 1024 MB
Core Speed 675 MHz 1000 MHz
Memory Speed 3600 MHz 3900 MHz
Power (Max TDP) 160 watts 190 watts
Bandwidth 115200 MB/sec 124800 MB/sec
Texel Rate 37800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 336 800(160x5)
Texture Mapping Units 56 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1950 million 959 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably 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 460 2GB

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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