Radeon HD 4850 2GB vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which has a core clock speed of 1100 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M385X should theoretically be quite a bit faster than the Radeon HD 4850 2GB overall. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 32448 (51%)

Texel Rate

The Radeon R9 M385X is much (about 146%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 36600 (146%)

Pixel Rate

The Radeon R9 M385X will be quite a bit (about 76%) more effective at FSAA than the Radeon HD 4850 2GB, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 7600 (76%)

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 data (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of 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 maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.