GeForce GT 340 vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which has clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 TAUs 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 4770		80 Watts
	Difference: 11 Watts (16%)

Memory Bandwidth

As far as performance goes, the GeForce GT 340 should in theory be a small bit better than the Radeon HD 4770 in general. (explain)

GeForce GT 340		54400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4770 is a lot (approximately 36%) better at AF than the GeForce GT 340. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 6400 (36%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4770 is superior to the GeForce GT 340, and very much so. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 7600 (173%)

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 information (counted in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 texture map elements (texels) that are applied per second. This figure is calculated 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.