GeForce GT 640 DDR3 vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which makes use of a 28 nm design. AMD has set the core frequency at 918 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this particular card. It features 1792 SPUs along with 112 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 285		8500 points
GeForce GT 640 DDR3		1560 points
	Difference: 6940 (445%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 285		190 Watts
	Difference: 125 Watts (192%)

Memory Bandwidth

As far as performance goes, the Radeon R9 285 should theoretically be much better than the GeForce GT 640 DDR3 overall. (explain)

Radeon R9 285		176000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 118976 (209%)

Texel Rate

The Radeon R9 285 should be a lot (about 257%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 74016 (257%)

Pixel Rate

The Radeon R9 285 is quite a bit (more or less 104%) more effective at AA than the GeForce GT 640 DDR3, and should be capable of handling higher screen resolutions better. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14976 (104%)

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 transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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.