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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7990 are noticeably better than the AMD Radeon HD 7970 Crossfire.

The Radeon HD 7990 has a 25 MHz higher core clock speed and the same number of Texture Mapping Units as the HD 7970. This results in the Radeon HD 7990 providing 6.4 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The Radeon HD 7990 has a 25 MHz higher core clock speed than the HD 7970 and the same number of Render Output Units. This results in the Radeon HD 7990 providing 1.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The Radeon HD 7990 was released less than a year after the HD 7970, and so they are likely to have similar driver support for optimizing performance when running the latest games.

Both GPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings.

The Radeon HD 7970 Crossfire and the Radeon HD 7990 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The Radeon HD 7990 has 48 GB/sec greater memory bandwidth than the HD 7970, which means that the memory performance of the Radeon HD 7990 is noticeably better than the HD 7970.

Both the Radeon HD 7970 Crossfire and the Radeon HD 7990 have 4096 Shader Processing Units. The two GPUs are based on different architectures, but deliver an equivalent shader performance. To compare, we must continue to look at the memory bandwidth, Texture and Pixel Rates. In this case, the Radeon HD 7990 has 6.4 GTexel/s better Texture Fill Rate, 1.6 GPixel/s better Pixel Fill Rate, and 48 GB/sec greater memory bandwidth, so should have a significantly faster performance than the HD 7970.

The Radeon HD 7970 Crossfire requires 460 Watts to run and the Radeon HD 7990 requires 375 Watts. We would recommend a PSU with at least 750 Watts for the Radeon HD 7990, but we do not have a recommended PSU wattage for the HD 7970. The HD 7970 requires 85 Watts more than the Radeon HD 7990 to run. The difference is significant enough that the HD 7970 may have an adverse affect on your yearly electricity bills in comparison to the Radeon HD 7990.

GPU Core Details

Core Speed925 MHzvs950 MHz
ArchitectureTahiti XTMalta
Notebook GPUnono
SLI/Crossfirenovsyes
Dedicatedyesvsyes
Release Date01 Jan 201223 Apr 2013
GPU LinkGD LinkGD Link
Approved
Comparison

GPU Memory

Memory6144 MBvs6144 MB
Memory Speed1375 MHzvs1500 MHz
Memory Bus768 Bitvs768 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth528GB/secvs576GB/sec
Comparison

GPU Display

Shader Processing Units4096vs4096
Actual Shader Performance2662.4vs2662.4
Technology28nmvs28nm
Texture Mapping Units256vs256
Texture Rate236.8 GTexel/svs243.2 GTexel/s
Render Output Units64vs64
Pixel Rate59.2 GPixel/svs60.8 GPixel/s
Comparison

GPU Display Tech

DirectX11.1vs11.1
Shader Model5.0vs5.0
Open GL4.2vs4.3
Max Resolution (WxH)4096x2160vs2560x1600
VGA Connections0vs0
DVI Connections0vs1
HDMI Connections0vs0
Comparison

GPU Power Requirements

Max Power460 Wattsvs375 Watts

GPU Supporting Hardware

Recommended RAM8 GBvs12 GB
Recommended Screen Size1920x10802560x1600
Recommended PSU-750 Watts & 46 Amps

Gaming Performance Value

Performance Value

Can I Run It

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GPU Mini Review

Mini ReviewRadeon HD 7970 Crossfire is a solution of two Radeon HD 7970 put together using AMD'S Crossfire technology.
Check the page of Radeon HD 7970 to know more about its chip.
Crossfire relies a lot on proper driver support and may suffer from micro-stuttering in lower frame rates (below 30). Benchmarks indicate the performance is overall, is up to 64% better than a single Radeon HD 7970 performing by itself but at times (depending whether or not the 3D game supports crossfire or in the graphics driver) it performed worse than a single Radeon HD 7970. Expect this combination to draw up to 600 Watt though the average power consumption should be slightly lower.
Even the most demanding games will run at the highest settings.
Radeon HD 7990 is a dual-graphics solution based on the 28nm, GCN architecture.
It's based on a Core codenamed "Malta" and offers 4096 Shader Processing Units (2048 per GPU), 256 TMUs (128 per GPU) and 64 ROPs (32 per GPU), on a 768-bit (368-bit per GPU) memory interface of fast GDDR5. The central unit runs at 950MHz (1000 in Turbo Mode) and the memory clock operates at 1500MHz.
It consumes up to 375W.
With the latest driver optimizations, benchmarks put this card as the fastest standard dual-graphics solution available.
Recommended CPUIntel Core i5-3570K 3.4GHz
Intel Xeon E3-1225 v2
Intel Core i5-3570 3.4GHz
Intel Core i5-4570 3.2GHz
AMD FX-6350
Intel Core i7-3820 4-Core 3.60GHz
AMD FX-9370
Intel Xeon E5-1620 v2
Intel Core i7-3770K 4-Core 3.5GHz
Intel Core i7-970 6-Core 3.2GHz
Possible GPU Upgrades--
GPU Variants--