GeForce GT 640 DDR3 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which uses a 14 nm design. AMD has clocked the core speed at 1257 MHz. The GDDR5 memory runs at a frequency of 2000 MHz on this model. It features 2304 SPUs along with 144 TAUs and 32 Rasterization Operator Units.

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 580		13630 points
GeForce GT 640 DDR3		1560 points
	Difference: 12070 (774%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon RX 580		185 Watts
	Difference: 120 Watts (185%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 580 will be 360% faster than the GeForce GT 640 DDR3 in general, because of its greater data rate. (explain)

Radeon RX 580		262144 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 205120 (360%)

Texel Rate

The Radeon RX 580 is a lot (more or less 529%) more effective at AF than the GeForce GT 640 DDR3. (explain)

Radeon RX 580		181008 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 152208 (529%)

Pixel Rate

The Radeon RX 580 should be quite a bit (more or less 179%) better at AA than the GeForce GT 640 DDR3, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon RX 580		40224 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 25824 (179%)

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 information (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must 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 high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a 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 - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.