GeForce GT 340 vs Radeon HD 3690/3830

Intro

Compare all of that to the Radeon HD 3690/3830, which has GPU clock speed of 668 MHz, and 256 MB of GDDR3 RAM running at 828 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 3690/3830		75 Watts
	Difference: 6 Watts (9%)

Memory Bandwidth

In theory, the GeForce GT 340 is 105% faster than the Radeon HD 3690/3830 in general, because of its higher bandwidth. (explain)

GeForce GT 340		54400 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 27904 (105%)

Texel Rate

The GeForce GT 340 will be a lot (approximately 65%) better at anisotropic filtering than the Radeon HD 3690/3830. (explain)

GeForce GT 340		17600 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 6912 (65%)

Pixel Rate

The Radeon HD 3690/3830 is quite a bit (more or less 143%) faster with regards to FSAA than the GeForce GT 340, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 6288 (143%)

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 largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.