GeForce GT 640 DDR3 vs Radeon R9 Nano

Intro

Compare those specs to the Radeon R9 Nano, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The HBM memory works at a speed of 500 MHz on this specific card. It features 4096 SPUs along with 256 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 theoretically be quite a bit superior to the GeForce GT 640 DDR3 in general. (explain)

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

Texel Rate

The Radeon R9 Nano should be much (about 789%) more effective at anisotropic filtering 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

If running with a high screen resolution is important to you, then the Radeon R9 Nano is a better choice, and very much so. (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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.