Radeon HD 5830 vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which uses a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this model. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 5830		175 Watts
	Difference: 125 Watts (250%)

Memory Bandwidth

In theory, the Radeon HD 5830 is 78% quicker than the Radeon R9 M275X in general, because of its higher data rate. (explain)

Radeon HD 5830		128000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The Radeon HD 5830 will be much (about 24%) better at AF than the Radeon R9 M275X. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 8800 (24%)

Pixel Rate

The Radeon R9 M275X should be just a bit (approximately 13%) more effective at full screen anti-aliasing than the Radeon HD 5830, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 5830		12800 Mpixels/sec
	Difference: 1600 (13%)

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 max amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.