Join Us On Facebook

Compare any two graphics cards:
VS

Geforce GTX 770 vs Radeon HD 7990

Intro

The Geforce GTX 770 uses a 28 nm design. nVidia has set the core speed at 1046 MHz. The GDDR5 RAM is set to run at a frequency of 1753 MHz on this specific card. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 7990, which features a GPU core clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770 230 Watts
Radeon HD 7990 375 Watts
Difference: 145 Watts (63%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform much faster than the Geforce GTX 770 overall. (explain)

Radeon HD 7990 576000 MB/sec
Geforce GTX 770 224384 MB/sec
Difference: 351616 (157%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 82%) better at texture filtering than the Geforce GTX 770. (explain)

Radeon HD 7990 243200 Mtexels/sec
Geforce GTX 770 133888 Mtexels/sec
Difference: 109312 (82%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is the winner, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Geforce GTX 770 33472 Mpixels/sec
Difference: 27328 (82%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Geforce GTX 770

Amazon.com

Radeon HD 7990

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 7990
Manufacturer nVidia AMD
Year May 2013 April 2013
Code Name GK104 Malta
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB (x2)
Core Speed 1046 MHz 950 MHz (x2)
Shader Speed 1046 MHz (N/A) MHz (x2)
Memory Speed 1753 MHz (7012 MHz effective) 1500 MHz (6000 MHz effective) (x2)
Unified Shaders 1536 2048 (x2)
Texture Mapping Units 128 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 230 watts 375 watts
Shader Model 5.0 5.0
Bandwidth 224384 MB/sec 576000 MB/sec
Texel Rate 133888 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 60800 Mpixels/sec

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Comments

2 Responses to “Geforce GTX 770 vs Radeon HD 7990”
Anonymous says:
nice compare !
Anonymous says:
nice comparealert('nice compare!');

Your email address will not be published.


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

WP-SpamFree by Pole Position Marketing