Radeon HD 4850 2GB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare those specs to the Radeon HD 6570 (OEM) 2GB, which makes use of a 40 nm design. AMD has set the core speed at 650 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this model. It features 480 SPUs along with 24 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 2GB		50 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 60 Watts (120%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6570 (OEM) 2GB should in theory be just a bit superior to the Radeon HD 4850 2GB in general. (explain)

Radeon HD 6570 (OEM) 2GB		64000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 448 (1%)

Texel Rate

The Radeon HD 4850 2GB should be much (more or less 60%) more effective at anisotropic filtering than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 9400 (60%)

Pixel Rate

The Radeon HD 4850 2GB should be quite a bit (about 92%) better at full screen anti-aliasing than the Radeon HD 6570 (OEM) 2GB, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
	Difference: 4800 (92%)

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 MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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