Radeon HD 4870 1GB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare those specs to the Radeon HD 6570 (OEM) 2GB, which features a core clock speed of 650 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 480 SPUs, 24 Texture Address Units, 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 4870 1GB		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically be a lot faster than the Radeon HD 6570 (OEM) 2GB in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon HD 6570 (OEM) 2GB		64000 MB/sec
	Difference: 51200 (80%)

Texel Rate

The Radeon HD 4870 1GB is much (more or less 92%) better at texture filtering than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 14400 (92%)

Pixel Rate

The Radeon HD 4870 1GB should be a lot (approximately 131%) faster with regards to AA than the Radeon HD 6570 (OEM) 2GB, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
	Difference: 6800 (131%)

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 max amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.