GeForce GT 340 1GB vs Radeon HD 7950

Intro

Compare that to the Radeon HD 7950, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 7950		200 Watts
	Difference: 131 Watts (190%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 is 341% quicker than the GeForce GT 340 1GB in general, because of its higher data rate. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 185600 (341%)

Texel Rate

The Radeon HD 7950 should be much (more or less 409%) more effective at AF than the GeForce GT 340 1GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 72000 (409%)

Pixel Rate

The Radeon HD 7950 should be a lot (more or less 482%) more effective at anti-aliasing than the GeForce GT 340 1GB, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 21200 (482%)

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 (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.