Radeon HD 4670 512MB vs Radeon HD 7850

Intro

Compare all that to the Radeon HD 7850, which features clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs along with 64 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 7850		130 Watts
	Difference: 60 Watts (86%)

Memory Bandwidth

In theory, the Radeon HD 7850 should perform a lot faster than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 121600 (380%)

Texel Rate

The Radeon HD 7850 is a lot (about 129%) faster with regards to texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 31040 (129%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is superior to the Radeon HD 4670 512MB, by far. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 21520 (359%)

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 information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.