GeForce GT 640 DDR3 vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which comes with core speeds of 900 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 Texture Address Units 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 R9 270		5943 points
GeForce GT 640 DDR3		1560 points
	Difference: 4383 (281%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 270		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

In theory, the Radeon R9 270 should be a lot faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon R9 270		179200 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 122176 (214%)

Texel Rate

The Radeon R9 270 will be much (more or less 150%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 43200 (150%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 270 is a better choice, by far. (explain)

Radeon R9 270		28800 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14400 (100%)

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 (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling 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 the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.