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

Intro

Compare that to the Radeon HD 6570 (OEM) 2GB, which comes with core speeds of 650 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 480 SPUs as well as 24 Texture Address Units 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 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 overall. (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 (approximately 92%) more effective at anisotropic 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

If using lots of anti-aliasing is important to you, then the Radeon HD 4870 1GB is superior to the Radeon HD 6570 (OEM) 2GB, by far. (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 maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 are applied per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.