GeForce GTS 250 512MB vs Radeon HD 5770

Intro

Compare all of that to the Radeon HD 5770, which makes use of a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTS 250 512MB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

The Radeon HD 5770, in theory, should perform a small bit faster than the GeForce GTS 250 512MB overall. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTS 250 512MB		70400 MB/sec
	Difference: 6400 (9%)

Texel Rate

The GeForce GTS 250 512MB should be a lot (about 39%) faster with regards to anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTS 250 512MB		47232 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 13232 (39%)

Pixel Rate

The Radeon HD 5770 will be just a bit (more or less 15%) faster with regards to FSAA than the GeForce GTS 250 512MB, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GTS 250 512MB		11808 Mpixels/sec
	Difference: 1792 (15%)

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 data (in units of megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.