GeForce GTS 250 512MB vs Radeon HD 6770

Intro

Compare all of that to the Radeon HD 6770, which features a clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, 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 512MB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 512MB should be 5% quicker than the Radeon HD 6770 overall, due to its higher data rate. (explain)

GeForce GTS 250 512MB		70400 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 3200 (5%)

Texel Rate

The GeForce GTS 250 512MB should be quite a bit (approximately 31%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTS 250 512MB		47232 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 11232 (31%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 is the winner, and very much so. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce GTS 250 512MB		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 max amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.