GeForce GT 640 DDR3 vs GeForce RTX 2070

Intro

Compare those specs to the GeForce RTX 2070, which features a GPU core clock speed of 1410 MHz, and 8192 MB of GDDR6 RAM set to run at 1750 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, 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 RTX 2070		22282 points
GeForce GT 640 DDR3		1560 points
	Difference: 20722 (1328%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 2070		175 Watts
	Difference: 110 Watts (169%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 2070 will be 704% faster than the GeForce GT 640 DDR3 overall, due to its higher data rate. (explain)

GeForce RTX 2070		458752 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 401728 (704%)

Texel Rate

The GeForce RTX 2070 should be quite a bit (approximately 605%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce RTX 2070		203040 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 174240 (605%)

Pixel Rate

The GeForce RTX 2070 should be quite a bit (about 527%) better at FSAA than the GeForce GT 640 DDR3, and also will be capable of handling higher resolutions while still performing well. (explain)

GeForce RTX 2070		90240 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 75840 (527%)

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 (counted in megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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