GeForce GTX 560 Ti vs Radeon HD 4890 2GB

Intro

Compare all that to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 975 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 560 Ti		170 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 20 Watts (12%)

Memory Bandwidth

The GeForce GTX 560 Ti should theoretically be a small bit faster than the Radeon HD 4890 2GB in general. (explain)

GeForce GTX 560 Ti		128256 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 3456 (3%)

Texel Rate

The GeForce GTX 560 Ti is quite a bit (about 32%) faster with regards to texture filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 560 Ti		52608 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 12608 (32%)

Pixel Rate

The GeForce GTX 560 Ti is much (more or less 64%) better at AA than the Radeon HD 4890 2GB, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 560 Ti		26304 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 10304 (64%)

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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.