Radeon HD 7770 vs Radeon HD 7950

Intro

Compare those specs to the Radeon HD 7950, which features GPU clock speed of 800 MHz, and 1536 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also features 1792 SPUs, 112 TAUs, and 32 Raster Operation 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 7950		7731 points
Radeon HD 7770		3180 points
	Difference: 4551 (143%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 7950		200 Watts
	Difference: 120 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be 233% faster than the Radeon HD 7770 overall, because of its greater data rate. (explain)

Radeon HD 7950		240000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon HD 7950 is a lot (more or less 124%) better at texture filtering than the Radeon HD 7770. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 49600 (124%)

Pixel Rate

The Radeon HD 7950 should be a lot (more or less 60%) more effective at full screen anti-aliasing than the Radeon HD 7770, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 9600 (60%)

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 moved past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many 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.