GeForce GTS 250 512MB vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which features GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory running at 1200 MHz through a 128-bit bus. It also features 800(160x5) 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 5770		108 Watts
GeForce GTS 250 512MB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

In theory, the Radeon HD 5770 should be a little bit faster than the GeForce GTS 250 512MB in general. (explain)

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

Texel Rate

The GeForce GTS 250 512MB is much (more or less 39%) better at texture 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 should be a bit (about 15%) faster with regards to FSAA than the GeForce GTS 250 512MB, and also capable of handling higher screen resolutions more effectively. (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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.