Radeon HD 4830 1GB vs Radeon R7 240

Intro

Compare that to the Radeon R7 240, which uses a 28 nm design. AMD has set the core speed at 730 MHz. The DDR3 RAM is set to run at a frequency of 900 MHz on this particular model. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 65 Watts (217%)

Memory Bandwidth

Performance-wise, the Radeon HD 4830 1GB should in theory be much better than the Radeon R7 240 in general. (explain)

Radeon HD 4830 1GB		57600 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 28800 (100%)

Texel Rate

The Radeon HD 4830 1GB should be much (approximately 26%) faster with regards to AF than the Radeon R7 240. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 3800 (26%)

Pixel Rate

The Radeon HD 4830 1GB should be quite a bit (more or less 58%) more effective at anti-aliasing than the Radeon R7 240, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 3360 (58%)

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 (measured in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.