GeForce 9500 GT DDR2 vs Radeon HD 7770

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9500 GT DDR2		50 Watts
Radeon HD 7770		80 Watts
	Difference: 30 Watts (60%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should perform a lot faster than the GeForce 9500 GT DDR2 in general. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 9500 GT DDR2		16000 MB/sec
	Difference: 56000 (350%)

Texel Rate

The Radeon HD 7770 will be a lot (more or less 355%) faster with regards to AF than the GeForce 9500 GT DDR2. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 9500 GT DDR2		8800 Mtexels/sec
	Difference: 31200 (355%)

Pixel Rate

The Radeon HD 7770 should be quite a bit (about 264%) more effective at AA than the GeForce 9500 GT DDR2, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 9500 GT DDR2		4400 Mpixels/sec
	Difference: 11600 (264%)

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 max amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.