Radeon HD 4650 512MB vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which has a core clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
Radeon R9 M395X		125 Watts
	Difference: 70 Watts (127%)

Memory Bandwidth

Theoretically, the Radeon R9 M395X should perform a lot faster than the Radeon HD 4650 512MB in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 144000 (900%)

Texel Rate

The Radeon R9 M395X should be a lot (approximately 382%) more effective at texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 73344 (382%)

Pixel Rate

The Radeon R9 M395X will be quite a bit (approximately 382%) better at FSAA than the Radeon HD 4650 512MB, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 18336 (382%)

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 (measured in megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.