GeForce GT 340 1GB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which comes with core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 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 1GB		69 Watts
Radeon HD 7770		80 Watts
	Difference: 11 Watts (16%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be 32% quicker than the GeForce GT 340 1GB overall, due to its greater bandwidth. (explain)

Radeon HD 7770		72000 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 17600 (32%)

Texel Rate

The Radeon HD 7770 is quite a bit (more or less 127%) better at AF than the GeForce GT 340 1GB. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 22400 (127%)

Pixel Rate

The Radeon HD 7770 should be a lot (about 264%) faster with regards to FSAA than the GeForce GT 340 1GB, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GT 340 1GB		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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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