GeForce GTX 650 vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory is set to run at a speed of 1375 MHz on this model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7970		8225 points
GeForce GTX 650		2263 points
	Difference: 5962 (263%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 7970		250 Watts
	Difference: 186 Watts (291%)

Memory Bandwidth

Theoretically, the Radeon HD 7970 should be quite a bit faster than the GeForce GTX 650 in general. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 184000 (230%)

Texel Rate

The Radeon HD 7970 will be much (about 250%) better at anisotropic filtering than the GeForce GTX 650. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 84544 (250%)

Pixel Rate

The Radeon HD 7970 should be quite a bit (more or less 75%) more effective at full screen anti-aliasing than the GeForce GTX 650, and will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 12672 (75%)

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 largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated 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 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 graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.