Radeon HD 4850 1GB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare those specifications to the Radeon HD 6570 (OEM) 2GB, which has a clock speed of 650 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 24 TAUs, and 8 Raster Operation 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 1GB		110 Watts
	Difference: 60 Watts (120%)

Memory Bandwidth

Performance-wise, the Radeon HD 6570 (OEM) 2GB should theoretically be a bit superior to the Radeon HD 4850 1GB overall. (explain)

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

Texel Rate

The Radeon HD 4850 1GB is much (more or less 60%) better at anisotropic filtering than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 9400 (60%)

Pixel Rate

The Radeon HD 4850 1GB should be much (approximately 92%) better at FSAA than the Radeon HD 6570 (OEM) 2GB, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4850 1GB		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: Bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.