GeForce GT 640 DDR3 vs Radeon R9 270

Intro

Compare all that to the Radeon R9 270, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1400 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 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 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

The Radeon R9 270 should theoretically be quite a bit 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 a lot (approximately 150%) more effective at texture 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

The Radeon R9 270 should be a lot (about 100%) faster with regards to anti-aliasing than the GeForce GT 640 DDR3, and also will be able to handle higher resolutions better. (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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.