GeForce GTX 260 vs Radeon HD 6770 1GB

Intro

Compare that to the Radeon HD 6770 1GB, which comes with GPU clock speed of 900 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 128-bit bus. It also is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 260		182 Watts
	Difference: 74 Watts (69%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 260 should be 67% faster than the Radeon HD 6770 1GB overall, because of its greater data rate. (explain)

GeForce GTX 260		111888 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 44688 (67%)

Texel Rate

The GeForce GTX 260 is a bit (about 2%) more effective at texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 260		36864 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 864 (2%)

Pixel Rate

The GeForce GTX 260 will be a small bit (about 12%) better at FSAA than the Radeon HD 6770 1GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 260		16128 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 1728 (12%)

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 data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.