GeForce GT 640 DDR3 vs Radeon HD 3470 256MB

Intro

Compare all of that to the Radeon HD 3470 256MB, which uses a 55 nm design. AMD has clocked the core speed at 800 MHz. The DDR2 memory works at a speed of 950 MHz on this particular card. It features 40(8x5) SPUs as well as 4 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 should perform much faster than the Radeon HD 3470 256MB overall. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon HD 3470 256MB		30400 MB/sec
	Difference: 26624 (88%)

Texel Rate

The GeForce GT 640 DDR3 should be a lot (about 800%) more effective at AF than the Radeon HD 3470 256MB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 3470 256MB		3200 Mtexels/sec
	Difference: 25600 (800%)

Pixel Rate

The GeForce GT 640 DDR3 will be a lot (more or less 350%) faster with regards to full screen anti-aliasing than the Radeon HD 3470 256MB, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 3470 256MB		3200 Mpixels/sec
	Difference: 11200 (350%)

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 information (measured in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.