GeForce GT 640 DDR3 vs Radeon RX 570

Intro

Compare all of that to the Radeon RX 570, which has a clock speed of 1168 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 256-bit memory bus, and makes use of a 14 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 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

Radeon RX 570		12108 points
GeForce GT 640 DDR3		1560 points
	Difference: 10548 (676%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon RX 570		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

In theory, the Radeon RX 570 will be 302% faster than the GeForce GT 640 DDR3 in general, because of its higher bandwidth. (explain)

Radeon RX 570		229376 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 172352 (302%)

Texel Rate

The Radeon RX 570 should be much (approximately 419%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 570		149504 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 120704 (419%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon RX 570 is superior to the GeForce GT 640 DDR3, by a large margin. (explain)

Radeon RX 570		37376 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 22976 (160%)

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 data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.