GeForce GT 340 vs Radeon HD 6790

Intro

Compare all that to the Radeon HD 6790, which makes use of a 40 nm design. AMD has clocked the core speed at 840 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this particular card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 6790		150 Watts
	Difference: 81 Watts (117%)

Memory Bandwidth

The Radeon HD 6790 should theoretically perform quite a bit faster than the GeForce GT 340 in general. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 80000 (147%)

Texel Rate

The Radeon HD 6790 will be much (approximately 91%) more effective at AF than the GeForce GT 340. (explain)

Radeon HD 6790		33600 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 16000 (91%)

Pixel Rate

The Radeon HD 6790 will be a lot (approximately 205%) better at full screen anti-aliasing than the GeForce GT 340, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 9040 (205%)

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 maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.