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GeForce GTX 560 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 560 has core clock speeds of 810 MHz on the GPU, and 1001 MHz on the 1024 MB of GDDR5 RAM. It features 336 SPUs as well as 56 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4850 X2 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 memory runs at a frequency of 993 MHz on this specific model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 560 150 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 560 should in theory be a bit superior to the Radeon HD 4850 X2 1GB in general. (explain)

GeForce GTX 560 128128 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 1024 (1%)

Texel Rate

The Radeon HD 4850 X2 1GB should be a small bit (more or less 10%) better at texture filtering than the GeForce GTX 560. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce GTX 560 45360 Mtexels/sec
Difference: 4640 (10%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 560 is the winner, and very much so. (explain)

GeForce GTX 560 25920 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 5920 (30%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 560

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 560 Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year May 2011 Nov 7, 2008
Code Name GF114 R700
Memory 1024 MB 1024 MB (x2)
Core Speed 810 MHz 625 MHz (x2)
Memory Speed 4004 MHz 1986 MHz (x2)
Power (Max TDP) 150 watts 250 watts
Bandwidth 128128 MB/sec 127104 MB/sec
Texel Rate 45360 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 25920 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 336 800(160x5) (x2)
Texture Mapping Units 56 40 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 1950 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 560

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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