Radeon R9 M275X vs Radeon R9 M385X

Intro

Compare all of that to the Radeon R9 M385X, which makes use of a 28 nm design. AMD has set the core frequency at 1100 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this specific card. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M385X should in theory perform quite a bit faster than the Radeon R9 M275X overall. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 24000 (33%)

Texel Rate

The Radeon R9 M385X is quite a bit (more or less 71%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 25600 (71%)

Pixel Rate

The Radeon R9 M385X will be much (approximately 22%) more effective at full screen anti-aliasing than the Radeon R9 M275X, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 3200 (22%)

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 largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR 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 of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.