GeForce GT 640 DDR3 vs Radeon R9 270X

Intro

Compare those specs to the Radeon R9 270X, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1400 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation 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 270X		6590 points
GeForce GT 640 DDR3		1560 points
	Difference: 5030 (322%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 270X		180 Watts
	Difference: 115 Watts (177%)

Memory Bandwidth

In theory, the Radeon R9 270X should perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The Radeon R9 270X will be much (about 178%) better at AF than the GeForce GT 640 DDR3. (explain)

Radeon R9 270X		80000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 51200 (178%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 270X is superior to the GeForce GT 640 DDR3, by a large margin. (explain)

Radeon R9 270X		32000 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 17600 (122%)

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 maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.