Radeon HD 4890 2GB vs Radeon R9 M395X

Intro

Compare all that to the Radeon R9 M395X, which has a clock frequency of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M395X should theoretically be much better than the Radeon HD 4890 2GB overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 35200 (28%)

Texel Rate

The Radeon R9 M395X is a lot (more or less 131%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 52544 (131%)

Pixel Rate

The Radeon R9 M395X should be quite a bit (more or less 45%) better at anti-aliasing than the Radeon HD 4890 2GB, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 7136 (45%)

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 maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 can be applied per second. This number is calculated 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number 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 outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.