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Radeon HD 7990 vs Radeon RX Vega 64

Intro

The Radeon HD 7990 features a clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon RX Vega 64, which uses a 14 nm design. AMD has set the core frequency at 1247 MHz. The HBM2 memory works at a speed of 1890 MHz on this card. It features 4096 SPUs along with 256 Texture Address Units and 64 ROPs.

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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

Radeon RX Vega 64 21986 points
Radeon HD 7990 15520 points
Difference: 6466 (42%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX Vega 64 295 Watts
Radeon HD 7990 375 Watts
Difference: 80 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be 16% faster than the Radeon RX Vega 64 overall, due to its higher bandwidth. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX Vega 64 495411 MB/sec
Difference: 80589 (16%)

Texel Rate

The Radeon RX Vega 64 will be much (about 31%) faster with regards to AF than the Radeon HD 7990. (explain)

Radeon RX Vega 64 319232 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 76032 (31%)

Pixel Rate

The Radeon RX Vega 64 will be much (about 31%) better at AA than the Radeon HD 7990, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon RX Vega 64 79808 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 19008 (31%)

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

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Radeon HD 7990

Amazon.com

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Radeon RX Vega 64

Amazon.com

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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

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Model Radeon HD 7990 Radeon RX Vega 64
Manufacturer AMD AMD
Year April 2013 August 2017
Code Name Malta Vega 10 XT
Memory 3072 MB (x2) 8192 MB
Core Speed 950 MHz (x2) 1247 MHz
Memory Speed 6000 MHz (x2) 1890 MHz
Power (Max TDP) 375 watts 295 watts
Bandwidth 576000 MB/sec 495411 MB/sec
Texel Rate 243200 Mtexels/sec 319232 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 79808 Mpixels/sec
Unified Shaders 2048 (x2) 4096
Texture Mapping Units 128 (x2) 256
Render Output Units 32 (x2) 64
Bus Type GDDR5 HBM2
Bus Width 384-bit (x2) 2048-bit
Fab Process 28 nm 14 nm
Transistors 4313 million 12500 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels 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 amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX Vega 64

Amazon.com

Check prices at:

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.

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