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Geforce GTX 770 vs Radeon HD 7990

Intro

The Geforce GTX 770 uses a 28 nm design. nVidia has set the core frequency at 1046 MHz. The GDDR5 RAM runs at a speed of 1753 MHz on this particular card. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Compare all that 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 Stream Processors, 128 TAUs, 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 7990 375 Watts
Difference: 145 Watts (63%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be a lot faster than the Geforce GTX 770 in general. (explain)

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

Texel Rate

The Radeon HD 7990 is a lot (about 82%) faster with regards to 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 superior to the Geforce GTX 770, and very much so. (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 largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could 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 the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

2 Responses to “Geforce GTX 770 vs Radeon HD 7990”
Anonymous says:
nice compare !
Anonymous says:
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