GeForce 9400 GT 256MB vs Radeon HD 6670 (OEM) 1GB

Intro

Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 480 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon HD 6670 (OEM) 1GB		63 Watts
	Difference: 13 Watts (26%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6670 (OEM) 1GB should theoretically be much better than the GeForce 9400 GT 256MB in general. (explain)

Radeon HD 6670 (OEM) 1GB		64000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB is quite a bit (about 336%) better at texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 14800 (336%)

Pixel Rate

The Radeon HD 6670 (OEM) 1GB will be quite a bit (approximately 191%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and also capable of handling higher resolutions better. (explain)

Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 4200 (191%)

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 information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 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 one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.