GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

Compare all that to the GeForce GTX Titan Black, which has a clock frequency of 889 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 2880 SPUs, 240 Texture Address Units, and 48 ROPs.

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

GeForce GTX Titan Black		11666 points
GeForce GT 640 DDR3		1560 points
	Difference: 10106 (648%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX Titan Black		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX Titan Black should perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX Titan Black		336000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 278976 (489%)

Texel Rate

The GeForce GTX Titan Black is quite a bit (approximately 641%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX Titan Black		213360 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 184560 (641%)

Pixel Rate

The GeForce GTX Titan Black will be quite a bit (more or less 196%) more effective at AA than the GeForce GT 640 DDR3, and should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX Titan Black		42672 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 28272 (196%)

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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of 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 maximum amount of pixels the video 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 amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.