Geforce GTX 680 vs Radeon HD 4670 512MB

Intro

Compare those specs to the Radeon HD 4670 512MB, which comes with core clock speeds of 750 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Geforce GTX 680		195 Watts
	Difference: 125 Watts (179%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 is 501% faster than the Radeon HD 4670 512MB in general, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 160256 (501%)

Texel Rate

The Geforce GTX 680 should be quite a bit (more or less 437%) better at texture filtering than the Radeon HD 4670 512MB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 104768 (437%)

Pixel Rate

The Geforce GTX 680 will be much (approximately 437%) better at FSAA than the Radeon HD 4670 512MB, and also capable of handling higher resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 26192 (437%)

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 max amount of data (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 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 potential to get to the maximum fill rate.