GeForce GTX 260 Core 216 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
GeForce GTX 260 Core 216		202 Watts
	Difference: 12 Watts (6%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should theoretically be a bit better than the GeForce GTX 260 Core 216 overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 260 Core 216		111888 MB/sec
	Difference: 12912 (12%)

Texel Rate

The GeForce GTX 260 Core 216 will be a bit (approximately 4%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

GeForce GTX 260 Core 216		41472 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 1472 (4%)

Pixel Rate

The GeForce GTX 260 Core 216 will be just a bit (about 1%) better at full screen anti-aliasing than the Radeon HD 4890 1GB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 260 Core 216		16128 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 128 (1%)

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 max amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. 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 many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.