GeForce GT 1030 vs GeForce GT 640 DDR3

Intro

Compare those specifications to the GeForce GT 640 DDR3, which has clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 1030		30 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 35 Watts (117%)

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 should be 16% quicker than the GeForce GT 1030 overall, because of its higher data rate. (explain)

GeForce GT 640 DDR3		57024 MB/sec
GeForce GT 1030		49152 MB/sec
	Difference: 7872 (16%)

Texel Rate

The GeForce GT 1030 should be a lot (more or less 41%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GT 1030		40480 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 11680 (41%)

Pixel Rate

The GeForce GT 1030 is much (more or less 41%) more effective at AA than the GeForce GT 640 DDR3, and should be able to handle higher resolutions better. (explain)

GeForce GT 1030		20240 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 5840 (41%)

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 max amount of information (measured in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core 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 quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.