GeForce GT 340 vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which features core speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 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 4890 2GB		190 Watts
	Difference: 121 Watts (175%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should be 129% quicker than the GeForce GT 340 overall, because of its greater data rate. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 70400 (129%)

Texel Rate

The Radeon HD 4890 2GB should be much (about 127%) better at anisotropic filtering than the GeForce GT 340. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 22400 (127%)

Pixel Rate

The Radeon HD 4890 2GB should be a lot (more or less 264%) more effective at full screen anti-aliasing than the GeForce GT 340, and also able to handle higher resolutions while still performing well. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 11600 (264%)

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 (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write 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 speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 max fill rate.