GeForce 8400 GS 512MB vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which features GPU core speed of 1100 MHz, and 4096 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X should be a lot faster than the GeForce 8400 GS 512MB overall. (explain)

Radeon R9 M385X		96000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 89600 (1400%)

Texel Rate

The Radeon R9 M385X will be much (approximately 1085%) more effective at texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 56400 (1085%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M385X is superior to the GeForce 8400 GS 512MB, by far. (explain)

Radeon R9 M385X		17600 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 15000 (577%)

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 (measured in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 are processed in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.