GeForce 8400 GS 512MB vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 68 Watts (170%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should be 950% faster than the GeForce 8400 GS 512MB overall, due to its higher bandwidth. (explain)

Radeon HD 6770 1GB		67200 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 60800 (950%)

Texel Rate

The Radeon HD 6770 1GB is quite a bit (approximately 592%) faster with regards to AF than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 30800 (592%)

Pixel Rate

The Radeon HD 6770 1GB is quite a bit (approximately 454%) more effective at AA than the GeForce 8400 GS 512MB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 11800 (454%)

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 data (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount 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 processed in a second.

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