GeForce GT 340 vs Radeon R9 285

Intro

Compare all that to the Radeon R9 285, which comes with clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon R9 285		190 Watts
	Difference: 121 Watts (175%)

Memory Bandwidth

As far as performance goes, the Radeon R9 285 should theoretically be a lot better than the GeForce GT 340 in general. (explain)

Radeon R9 285		176000 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 121600 (224%)

Texel Rate

The Radeon R9 285 is much (approximately 484%) better at AF than the GeForce GT 340. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 85216 (484%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 285 is a better choice, by a large margin. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 24976 (568%)

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 information (measured in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, 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 figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.