Radeon HD 4650 512MB vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which has core 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

Performance-wise, the Radeon R9 M385X should theoretically be much better than the Radeon HD 4650 512MB overall. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 80000 (500%)

Texel Rate

The Radeon R9 M385X will be quite a bit (about 221%) faster with regards to texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 42400 (221%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M385X is a better choice, by a large margin. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 12800 (267%)

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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at 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 that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.