GeForce GT 640 DDR3 vs Radeon R9 285

Intro

Compare all of that to the Radeon R9 285, which makes use of a 28 nm design. AMD has set the core speed at 918 MHz. The GDDR5 RAM works at a frequency of 1375 MHz on this card. It features 1792 SPUs along with 112 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 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

The Radeon R9 285 should theoretically be a lot faster 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 will be quite a bit (more or less 257%) faster with regards to AF 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 should be much (about 104%) more effective at FSAA than the GeForce GT 640 DDR3, and should be able to handle 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 max amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher 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 that the graphics chip can possibly record to the 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 the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.