Radeon HD 4650 512MB vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which comes with clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M385X should in theory perform quite a bit faster 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 is quite a bit (approximately 221%) more effective at AF 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 running with 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 largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 processed in one second. This figure 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 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 card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.