GeForce GT 640 DDR3 vs Radeon RX 480

Intro

Compare those specs to the Radeon RX 480, which has a core clock frequency 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 features 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

Theoretically speaking, the Radeon RX 480 should perform quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The Radeon RX 480 should be a lot (approximately 460%) more effective 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

The Radeon RX 480 should be quite a bit (approximately 149%) better at full screen anti-aliasing than the GeForce GT 640 DDR3, and also will be able to handle higher screen resolutions without slowing down too much. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one 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 - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.