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Geforce GTX 770 vs Radeon HD 7970

Intro

The Geforce GTX 770 has a clock speed of 1046 MHz and a GDDR5 memory speed of 1753 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1536 SPUs, 128 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 7970, which comes with GPU clock speed of 925 MHz, and 3072 MB of GDDR5 memory set to run at 1375 MHz through a 384-bit bus. It also features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770 230 Watts
Radeon HD 7970 250 Watts
Difference: 20 Watts (9%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should in theory be a small bit better than the Geforce GTX 770 in general. (explain)

Radeon HD 7970 264000 MB/sec
Geforce GTX 770 224384 MB/sec
Difference: 39616 (18%)

Texel Rate

The Geforce GTX 770 should be a small bit (more or less 13%) faster with regards to AF than the Radeon HD 7970. (explain)

Geforce GTX 770 133888 Mtexels/sec
Radeon HD 7970 118400 Mtexels/sec
Difference: 15488 (13%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 770 is a better choice, not by a very large margin though. (explain)

Geforce GTX 770 33472 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 3872 (13%)

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 770

Amazon.com

Radeon HD 7970

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model Geforce GTX 770 Radeon HD 7970
Manufacturer nVidia AMD
Year May 2013 January 2012
Code Name GK104 Tahiti XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 1046 MHz 925 MHz
Shader Speed 1046 MHz (N/A) MHz
Memory Speed 1753 MHz (7012 MHz effective) 1375 MHz (5500 MHz effective)
Unified Shaders 1536 2048
Texture Mapping Units 128 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 230 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 224384 MB/sec 264000 MB/sec
Texel Rate 133888 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a 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 - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Comments

5 Responses to “Geforce GTX 770 vs Radeon HD 7970”
Blub says:
which card is better a msi r7970 lightning or evga 770 titan cooled ?
becouse i have a r7970 lightning.. :S
Scott says:
Depends, For video editing yes for most games, No. AMD Cards are better for Video editing and better at some games but Nividia is better for gaming, especially on the really popular games, BF3,Far Cry 3 ect... Those cards are pretty close though. The Asus 7970 ROG Matrix is better than the Lightning because of it's better cooling and heat dissipation. The 7970 ROG Matrix is also clocked to 316 GB/s and is much quieter and cooler than reference and lightning 7970's.
Hus says:
Add GHZ edition please
Lachlan says:
Add GHZ edition please
Bedendo says:
The Core Speed and Pixel Rate is wrong about 7970, fix this!

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