GeForce GTX 560 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which comes with a core clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 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 560		150 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 40 Watts (27%)

Memory Bandwidth

In theory, the GeForce GTX 560 will be 3% faster than the Radeon HD 4890 1GB in general, due to its greater data rate. (explain)

GeForce GTX 560		128128 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 3328 (3%)

Texel Rate

The GeForce GTX 560 is a bit (more or less 13%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

GeForce GTX 560		45360 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 5360 (13%)

Pixel Rate

The GeForce GTX 560 is quite a bit (approximately 62%) better at anti-aliasing than the Radeon HD 4890 1GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 560		25920 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 9920 (62%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.