Radeon HD 4830 1GB vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this specific model. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Radeon HD 7850		130 Watts
	Difference: 35 Watts (37%)

Memory Bandwidth

The Radeon HD 7850, in theory, should be quite a bit faster than the Radeon HD 4830 1GB in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 96000 (167%)

Texel Rate

The Radeon HD 7850 is much (approximately 199%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 36640 (199%)

Pixel Rate

The Radeon HD 7850 should be much (more or less 199%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 18320 (199%)

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 information (measured in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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.