GeForce 8400 GS 512MB vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory is set to run at a speed of 1050 MHz on this model. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon HD 6770, in theory, should be much faster than the GeForce 8400 GS 512MB overall. (explain)

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

Texel Rate

The Radeon HD 6770 will be quite a bit (about 592%) faster with regards to texture filtering than the GeForce 8400 GS 512MB. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 is superior to the GeForce 8400 GS 512MB, by a large margin. (explain)

Radeon HD 6770		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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.