Radeon HD 4670 1GB vs Radeon R9 270

Intro

Compare those specs to the Radeon R9 270, which makes use of a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory works at a frequency of 1400 MHz on this model. It features 1280 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon R9 270		150 Watts
	Difference: 80 Watts (114%)

Memory Bandwidth

The Radeon R9 270 should theoretically be a lot faster than the Radeon HD 4670 1GB overall. (explain)

Radeon R9 270		179200 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 144000 (409%)

Texel Rate

The Radeon R9 270 will be much (more or less 200%) faster with regards to texture filtering than the Radeon HD 4670 1GB. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 48000 (200%)

Pixel Rate

The Radeon R9 270 is much (more or less 380%) more effective at anti-aliasing than the Radeon HD 4670 1GB, and also should be capable of handling higher resolutions better. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 22800 (380%)

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 megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.