GeForce GT 640 DDR3 vs GeForce GTX 1070 Ti

Intro

Compare that to the GeForce GTX 1070 Ti, which features a clock speed of 1607 MHz and a GDDR5 memory speed of 2000 MHz. It also uses a 256-bit memory bus, and makes use of a 16 nm design. It is made up of 2432 SPUs, 152 TAUs, and 64 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

GeForce GTX 1070 Ti		19808 points
GeForce GT 640 DDR3		1560 points
	Difference: 18248 (1170%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 1070 Ti		180 Watts
	Difference: 115 Watts (177%)

Memory Bandwidth

Performance-wise, the GeForce GTX 1070 Ti should theoretically be much better than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 1070 Ti		262144 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 205120 (360%)

Texel Rate

The GeForce GTX 1070 Ti should be much (about 748%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 1070 Ti		244264 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 215464 (748%)

Pixel Rate

The GeForce GTX 1070 Ti is quite a bit (more or less 614%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 1070 Ti		102848 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 88448 (614%)

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 information (in units of megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.