Radeon HD 4670 512MB vs Radeon R9 M385X

Intro

Compare all that to the Radeon R9 M385X, which has core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M385X will be 200% faster than the Radeon HD 4670 512MB overall, because of its greater bandwidth. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 64000 (200%)

Texel Rate

The Radeon R9 M385X should be quite a bit (approximately 157%) better at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 37600 (157%)

Pixel Rate

The Radeon R9 M385X is a lot (approximately 193%) faster with regards to full screen anti-aliasing than the Radeon HD 4670 512MB, and capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 11600 (193%)

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 max amount of data (measured in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.