GeForce GT 340 1GB vs Radeon HD 5770

Intro

Compare all of that to the Radeon HD 5770, which comes with GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory running at 1200 MHz through a 128-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 5770		108 Watts
	Difference: 39 Watts (57%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5770 is 41% faster than the GeForce GT 340 1GB overall, because of its greater data rate. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 22400 (41%)

Texel Rate

The Radeon HD 5770 will be quite a bit (approximately 93%) faster with regards to AF than the GeForce GT 340 1GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 16400 (93%)

Pixel Rate

The Radeon HD 5770 should be a lot (approximately 209%) better at full screen anti-aliasing than the GeForce GT 340 1GB, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 9200 (209%)

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to 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.