GeForce GT 640 DDR3 vs Radeon RX 480

Intro

Compare those specifications to the Radeon RX 480, which features a clock speed of 1120 MHz and a GDDR5 memory speed of 2000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 14 nm design. It is made up of 2304 SPUs, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon RX 480		13349 points
GeForce GT 640 DDR3		1560 points
	Difference: 11789 (756%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon RX 480		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

Performance-wise, the Radeon RX 480 should in theory be much better than the GeForce GT 640 DDR3 in general. (explain)

Radeon RX 480		262144 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 205120 (360%)

Texel Rate

The Radeon RX 480 will be much (more or less 460%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 480		161280 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 132480 (460%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 480 is a better choice, and very much so. (explain)

Radeon RX 480		35840 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 21440 (149%)

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 data (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.