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GeForce GTX 650 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 650 has clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 4890 2GB, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 126 Watts (197%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 2GB should theoretically be a lot superior to the GeForce GTX 650 overall. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 44800 (56%)

Texel Rate

The Radeon HD 4890 2GB will be a small bit (more or less 18%) better at texture filtering than the GeForce GTX 650. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 6144 (18%)

Pixel Rate

The GeForce GTX 650 will be a small bit (more or less 6%) more effective at anti-aliasing than the Radeon HD 4890 2GB, and also capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 928 (6%)

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 650

Amazon.com

Radeon HD 4890 2GB

Amazon.com

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 650 Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year September 2012 Apr 2, 2009
Code Name GK107 RV790 XT
Memory 2048 MB 2048 MB
Core Speed 1058 MHz 1000 MHz
Memory Speed 5000 MHz 3900 MHz
Power (Max TDP) 64 watts 190 watts
Bandwidth 80000 MB/sec 124800 MB/sec
Texel Rate 33856 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 384 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 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 (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at 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 video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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