GeForce GT 340 1GB vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs as well as 64 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 7850		130 Watts
	Difference: 61 Watts (88%)

Memory Bandwidth

Performance-wise, the Radeon HD 7850 should theoretically be much better than the GeForce GT 340 1GB overall. (explain)

Radeon HD 7850		153600 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 99200 (182%)

Texel Rate

The Radeon HD 7850 will be much (about 213%) faster with regards to AF than the GeForce GT 340 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 37440 (213%)

Pixel Rate

The Radeon HD 7850 is quite a bit (approximately 525%) faster with regards to FSAA than the GeForce GT 340 1GB, and capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 23120 (525%)

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 data (measured in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount 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 amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.