Radeon HD 4850 1GB vs Radeon R9 M385X

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X will be 51% faster than the Radeon HD 4850 1GB in general, due to its higher data rate. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 32448 (51%)

Texel Rate

The Radeon R9 M385X should be much (approximately 146%) more effective at AF than the Radeon HD 4850 1GB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 36600 (146%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M385X is the winner, and very much so. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 4850 1GB		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 largest amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.