GeForce 9400 GT 256MB vs Radeon HD 7770

Intro

Compare those specs to the Radeon HD 7770, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon HD 7770		80 Watts
	Difference: 30 Watts (60%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be much faster than the GeForce 9400 GT 256MB overall. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7770 should be a lot (more or less 809%) faster with regards to anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 35600 (809%)

Pixel Rate

The Radeon HD 7770 will be a lot (more or less 627%) more effective at full screen anti-aliasing than the GeForce 9400 GT 256MB, and will be able to handle higher resolutions better. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 13800 (627%)

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 largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.