GeForce 8400 GS 512MB vs Radeon R9 M395X

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon R9 M395X		125 Watts
	Difference: 85 Watts (213%)

Memory Bandwidth

In theory, the Radeon R9 M395X should be 2400% faster than the GeForce 8400 GS 512MB overall, because of its higher data rate. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 153600 (2400%)

Texel Rate

The Radeon R9 M395X will be much (approximately 1680%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 87344 (1680%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M395X is a better choice, by far. (explain)

Radeon R9 M395X		23136 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 20536 (790%)

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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one 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 this number, the better the video 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 the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.