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Geforce GTX 690 vs Radeon HD 7790

Intro

The Geforce GTX 690 comes with a core clock frequency of 915 MHz and a GDDR5 memory speed of 1502 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7790, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this specific card. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Geforce GTX 690 300 Watts
Difference: 215 Watts (253%)

Memory Bandwidth

In theory, the Geforce GTX 690 will be 301% quicker than the Radeon HD 7790 overall, because of its greater data rate. (explain)

Geforce GTX 690 384512 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 288512 (301%)

Texel Rate

The Geforce GTX 690 should be a lot (more or less 318%) faster with regards to AF than the Radeon HD 7790. (explain)

Geforce GTX 690 234240 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 178240 (318%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 690 is a better choice, and very much so. (explain)

Geforce GTX 690 58560 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 42560 (266%)

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 690

Amazon.com

Radeon HD 7790

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 690 Radeon HD 7790
Manufacturer nVidia AMD
Year April 2012 March 2013
Code Name GK104 Bonaire XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB (x2) 1024 MB
Core Speed 915 MHz (x2) 1000 MHz
Shader Speed 915 MHz (x2) (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) (x2) 1500 MHz (6000 MHz effective)
Unified Shaders 1536 (x2) 896
Texture Mapping Units 128 (x2) 56
Render Output Units 32 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 128-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 300 watts 85 watts
Shader Model 5.0 5.0
Bandwidth 384512 MB/sec 96000 MB/sec
Texel Rate 234240 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 58560 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out 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 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 most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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