GeForce GTS 250 512MB vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which features a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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 will be 5% quicker than the Radeon HD 6770 overall, due to its greater 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 will be quite a bit (approximately 31%) better at AF than the Radeon HD 6770. (explain)

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

Pixel Rate

The Radeon HD 6770 will be much (more or less 22%) faster with regards to FSAA than the GeForce GTS 250 512MB, and capable of handling higher screen resolutions more effectively. (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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.