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Geforce GTX 780 vs Radeon HD 7950


Intro

The Geforce GTX 780 makes use of a 28 nm design. nVidia has set the core frequency at 863 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this card. It features 2304 SPUs as well as 192 Texture Address Units and 48 ROPs.

Compare all of that to the Radeon HD 7950, which features GPU core speed of 800 MHz, and 1536 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

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

Geforce GTX 780 10067 points
Radeon HD 7950 7731 points
Difference: 2336 (30%)

Ethereum Mining Hash Rate

Radeon HD 7950 21 Mh/s
Geforce GTX 780 20 Mh/s
Difference: 1 (5%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Geforce GTX 780 250 Watts
Difference: 50 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 will be 20% quicker than the Radeon HD 7950 in general, due to its greater data rate. (explain)

Geforce GTX 780 288384 MB/sec
Radeon HD 7950 240000 MB/sec
Difference: 48384 (20%)

Texel Rate

The Geforce GTX 780 will be much (approximately 85%) more effective at anisotropic filtering than the Radeon HD 7950. (explain)

Geforce GTX 780 165696 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 76096 (85%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 780 is superior to the Radeon HD 7950, by a large margin. (explain)

Geforce GTX 780 41424 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 15824 (62%)

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

Geforce GTX 780

Radeon HD 7950

Specifications

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Model Geforce GTX 780 Radeon HD 7950
Manufacturer nVidia AMD
Year May 2013 January 2012
Code Name GK110 Tahiti Pro
Memory 3072 MB 1536 MB
Core Speed 863 MHz 800 MHz
Memory Speed 6008 MHz 5000 MHz
Power (Max TDP) 250 watts 200 watts
Bandwidth 288384 MB/sec 240000 MB/sec
Texel Rate 165696 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 2304 1792
Texture Mapping Units 192 112
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 7080 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of 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.

Geforce GTX 780

Radeon HD 7950

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