GeForce GT 640 DDR3 vs Radeon R9 Nano

Intro

Compare all that to the Radeon R9 Nano, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The HBM memory runs at a frequency of 500 MHz on this particular model. It features 4096 SPUs along with 256 TAUs and 64 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 R9 Nano		14918 points
GeForce GT 640 DDR3		1560 points
	Difference: 13358 (856%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 Nano		175 Watts
	Difference: 110 Watts (169%)

Memory Bandwidth

Performance-wise, the Radeon R9 Nano should in theory be much better than the GeForce GT 640 DDR3 overall. (explain)

Radeon R9 Nano		512000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 454976 (798%)

Texel Rate

The Radeon R9 Nano is quite a bit (about 789%) more effective at AF than the GeForce GT 640 DDR3. (explain)

Radeon R9 Nano		256000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 227200 (789%)

Pixel Rate

The Radeon R9 Nano is quite a bit (more or less 344%) more effective at FSAA than the GeForce GT 640 DDR3, and also should be capable of handling higher resolutions better. (explain)

Radeon R9 Nano		64000 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 49600 (344%)

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 information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. 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 output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.