GeForce GTS 250 1GB vs Radeon HD 5770

Intro

Compare those specifications to the Radeon HD 5770, which comes with GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 128-bit bus. It also is made up of 800(160x5) Stream Processors, 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 1GB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

The Radeon HD 5770 should in theory perform a little bit faster than the GeForce GTS 250 1GB overall. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTS 250 1GB		70400 MB/sec
	Difference: 6400 (9%)

Texel Rate

The GeForce GTS 250 1GB will be much (about 39%) better at texture filtering than the Radeon HD 5770. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 13232 (39%)

Pixel Rate

The Radeon HD 5770 is just a bit (approximately 15%) faster with regards to AA than the GeForce GTS 250 1GB, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GTS 250 1GB		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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, 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 amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour 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 output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.