Radeon HD 5870 vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit bus, and uses a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 5870		188 Watts
	Difference: 138 Watts (276%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5870 should theoretically be a lot superior to the Radeon R9 M275X in general. (explain)

Radeon HD 5870		153600 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 5870 will be much (approximately 89%) more effective at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 32000 (89%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5870 is superior to the Radeon R9 M275X, by a large margin. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 12800 (89%)

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 data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better 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 most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.