GeForce 9400 GT 256MB vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon HD 6770		108 Watts
	Difference: 58 Watts (116%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 is 425% faster than the GeForce 9400 GT 256MB overall, because of its greater data rate. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 54400 (425%)

Texel Rate

The Radeon HD 6770 is a lot (more or less 718%) better at texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 31600 (718%)

Pixel Rate

The Radeon HD 6770 will be much (more or less 555%) more effective at anti-aliasing than the GeForce 9400 GT 256MB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 12200 (555%)

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 maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.