GeForce 9800 GT 512MB vs Radeon HD 7750

Intro

Compare that to the Radeon HD 7750, which comes with a core clock frequency of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
GeForce 9800 GT 512MB		105 Watts
	Difference: 50 Watts (91%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 should perform much faster than the GeForce 9800 GT 512MB overall. (explain)

Radeon HD 7750		72000 MB/sec
GeForce 9800 GT 512MB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The GeForce 9800 GT 512MB is a lot (approximately 31%) better at anisotropic filtering than the Radeon HD 7750. (explain)

GeForce 9800 GT 512MB		33600 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 8000 (31%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7750 is the winner, by a large margin. (explain)

Radeon HD 7750		12800 Mpixels/sec
GeForce 9800 GT 512MB		9600 Mpixels/sec
	Difference: 3200 (33%)

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 information (in units of megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses 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 high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.