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GeForce GTX 560 Ti vs Radeon HD 4870 2GB

Intro

The GeForce GTX 560 Ti comes with clock speeds of 822 MHz on the GPU, and 1002 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs along with 64 Texture Address Units and 32 ROPs.

Compare that to the Radeon HD 4870 2GB, which uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM works at a speed of 900 MHz on this card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
GeForce GTX 560 Ti 170 Watts
Difference: 20 Watts (13%)

Memory Bandwidth

The GeForce GTX 560 Ti should in theory perform a small bit faster than the Radeon HD 4870 2GB in general. (explain)

GeForce GTX 560 Ti 128256 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 13056 (11%)

Texel Rate

The GeForce GTX 560 Ti is a lot (more or less 75%) more effective at texture filtering than the Radeon HD 4870 2GB. (explain)

GeForce GTX 560 Ti 52608 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 22608 (75%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 560 Ti is the winner, by a large margin. (explain)

GeForce GTX 560 Ti 26304 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 14304 (119%)

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

GeForce GTX 560 Ti

Amazon.com

Radeon HD 4870 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

Model GeForce GTX 560 Ti Radeon HD 4870 2GB
Manufacturer nVidia AMD
Year January 2011 Jun 25, 2008
Code Name GF114 RV770 XT
Fab Process 40 nm 55 nm
Bus PCIe x16 PCIe 2.0 x16
Memory 1024 MB 2048 MB
Core Speed 822 MHz 750 MHz
Shader Speed 1645 MHz (N/A) MHz
Memory Speed 1002 MHz (4008 MHz effective) 900 MHz (3600 MHz effective)
Unified Shaders 384 800(160x5)
Texture Mapping Units 64 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0
Power (Max TDP) 170 watts 150 watts
Shader Model 5.0 4.1
Bandwidth 128256 MB/sec 115200 MB/sec
Texel Rate 52608 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 26304 Mpixels/sec 12000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result 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, 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 texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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