Radeon HD 5870 vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which features a core clock speed of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 5870 should be quite a bit faster than the Radeon R9 M265X in general. (explain)

Radeon HD 5870		153600 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 5870 is quite a bit (approximately 196%) more effective at texture filtering than the Radeon R9 M265X. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 45000 (196%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5870 is the winner, and very much so. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 18000 (196%)

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 information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.