GeForce GTX 560 vs Radeon HD 4890 1GB

Intro

Compare all that to the Radeon HD 4890 1GB, which has a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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

Performance-wise, the GeForce GTX 560 should theoretically be a small bit better than the Radeon HD 4890 1GB in general. (explain)

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

Texel Rate

The GeForce GTX 560 should be a bit (approximately 13%) better at texture filtering 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

If running with a high screen resolution is important to you, then the GeForce GTX 560 is superior to the Radeon HD 4890 1GB, and very much so. (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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.