GeForce GT 340 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which has a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 39 Watts (57%)

Memory Bandwidth

The Radeon HD 6770 1GB should in theory be much faster than the GeForce GT 340 overall. (explain)

Radeon HD 6770 1GB		67200 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 12800 (24%)

Texel Rate

The Radeon HD 6770 1GB will be quite a bit (more or less 105%) better at anisotropic filtering than the GeForce GT 340. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 18400 (105%)

Pixel Rate

The Radeon HD 6770 1GB should be a lot (more or less 227%) faster with regards to full screen anti-aliasing than the GeForce GT 340, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 10000 (227%)

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 maximum amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, 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 number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.