GeForce GT 640 DDR3 vs GeForce GTX 570

Intro

Compare all of that to the GeForce GTX 570, which features core speeds of 732 MHz on the GPU, and 950 MHz on the 1280 MB of GDDR5 memory. It features 480 SPUs as well as 60 TAUs and 40 Rasterization Operator Units.

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 570		4387 points
GeForce GT 640 DDR3		1560 points
	Difference: 2827 (181%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 570		219 Watts
	Difference: 154 Watts (237%)

Memory Bandwidth

The GeForce GTX 570, in theory, should perform quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 570		152000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 94976 (167%)

Texel Rate

The GeForce GTX 570 should be quite a bit (approximately 53%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 570		43920 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 15120 (53%)

Pixel Rate

The GeForce GTX 570 will be much (more or less 103%) better at FSAA than the GeForce GT 640 DDR3, and also should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 570		29280 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14880 (103%)

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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.