GeForce GTS 250 1GB vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs along with 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		108 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB will be 5% faster than the Radeon HD 6770 overall, because of its greater bandwidth. (explain)

GeForce GTS 250 1GB		70400 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 3200 (5%)

Texel Rate

The GeForce GTS 250 1GB should be quite a bit (more or less 31%) better at AF than the Radeon HD 6770. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 11232 (31%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6770 is the winner, by far. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 2592 (22%)

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 (counted in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core 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 a 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 number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.