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

Intro

Compare that to the Radeon HD 6570 (OEM) 1GB, which has a core clock speed of 650 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 480 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 1GB		50 Watts
Radeon HD 4870 2GB		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 2GB should theoretically be much better than the Radeon HD 6570 (OEM) 1GB overall. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon HD 6570 (OEM) 1GB		28800 MB/sec
	Difference: 86400 (300%)

Texel Rate

The Radeon HD 4870 2GB will be a lot (more or less 92%) faster with regards to texture filtering than the Radeon HD 6570 (OEM) 1GB. (explain)

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

Pixel Rate

The Radeon HD 4870 2GB will be a lot (more or less 131%) faster with regards to anti-aliasing than the Radeon HD 6570 (OEM) 1GB, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4870 2GB		12000 Mpixels/sec
Radeon HD 6570 (OEM) 1GB		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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 fill 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 ability to reach the maximum fill rate.