GeForce GT 640 DDR3 vs Radeon R7 260X

Intro

Compare that to the Radeon R7 260X, which makes use of a 28 nm design. AMD has set the core frequency at 1100 MHz. The GDDR5 memory runs at a frequency of 1625 MHz on this card. It features 896 SPUs as well as 56 Texture Address Units and 16 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 R7 260X		4381 points
GeForce GT 640 DDR3		1560 points
	Difference: 2821 (181%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R7 260X		115 Watts
	Difference: 50 Watts (77%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 260X is 82% faster than the GeForce GT 640 DDR3 overall, due to its higher data rate. (explain)

Radeon R7 260X		104000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 46976 (82%)

Texel Rate

The Radeon R7 260X is quite a bit (approximately 114%) faster with regards to AF than the GeForce GT 640 DDR3. (explain)

Radeon R7 260X		61600 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 32800 (114%)

Pixel Rate

The Radeon R7 260X is a lot (approximately 22%) more effective at AA than the GeForce GT 640 DDR3, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon R7 260X		17600 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 3200 (22%)

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 largest amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.