GeForce GT 640 DDR3 vs Radeon HD 3650 256MB

Intro

Compare those specs to the Radeon HD 3650 256MB, which comes with core clock speeds of 725 MHz on the GPU, and 800 MHz on the 256 MB of DDR2 RAM. It features 120(24x5) SPUs along with 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 3650 256MB		78 Watts
	Difference: 13 Watts (20%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 is 123% quicker than the Radeon HD 3650 256MB in general, because of its greater data rate. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 31424 (123%)

Texel Rate

The GeForce GT 640 DDR3 should be a lot (about 397%) faster with regards to anisotropic filtering than the Radeon HD 3650 256MB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 23000 (397%)

Pixel Rate

The GeForce GT 640 DDR3 is a lot (more or less 397%) more effective at FSAA than the Radeon HD 3650 256MB, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 11500 (397%)

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 largest amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.