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Written by Olin Coles   
Wednesday, 16 March 2011
Table of Contents: Page Index
Sapphire 100310SR Radeon HD 6990
Sapphire Radeon HD 6990 Appearance
Antilles Detailed Features
Antilles Features and Specifications
Video Card Testing Methodology
DX9 SSAO: Mafia II
DX10: 3DMark Vantage
DX10: Crysis Warhead
DX11: 3DMark11
DX11: Aliens vs Predator
DX11: Battlefield Bad Company 2
DX11: BattleForge
DX11: Lost Planet 2
DX11: Metro 2033
DX11: Unigine Heaven 2.1
Overclocking and Temperatures
VGA Power Consumption
Sapphire Radeon 6990 Conclusion

Antilles Detailed Features

In the image below, we've included an exposed PCB illustration supplied by AMD. According to their media presentation, the Radeon HD 6990 uses a special phase-change thermal interface material that loses its effectiveness once the heatsink has been removed. Used in conjunction with an improved cooling solution, according to AMD the Radeon HD 6990 yields 8% better thermal performance when compared to previous thermal management solutions they've used. Click on the image below for a larger high-resolution version.

AMD-Radeon-HD-6990-Exposed-PCB.jpg

The redesigned cooling solution on Antilles uses two independent heatsinks mounted between a blower motor fan to cool each Cayman GPU. Will this be enough? We reveal our temperature testing results later on in this article.

AMD-Radeon-HD-6990-Heatsink.jpg

Antilles uses two 40nm Cayman GPUs on the Radeon HD 6990. Each GPU is clocked to 830 MHz by default, but can be switched to 880 MHz using the dual-BIOS. Additionally, AMD's PowerTune software allows the same options through the Catalyst Control Center.

AMD-Radeon-HD-6990-Cayman-GPU.jpg

A pair of Cooper Bussmann coupled inductors labeled with CLA1108-4-50TR-R markings are surrounded by what AMD is referring to as digital programmable regulators made by Volterra Semiconductor.

AMD-Radeon-HD-6990-Volterra-Regulators.jpg

The AMD Radeon HD 6990 features 4GB GDDR5 video frame buffer memory, supplied by several Hynix H5GQ2H24MFR-T2C components. Hynix defines the speed of these parts using the T2C indicator code, which represents 2.5 GHz. According to Hynix, this GDDR5 graphics memory can reach 5.0 Gbps bandwidth with 1.5V or 3.6 Gbps with 1.35V, depending on voltage applied.

AMD-Radeon-HD-6990-Hynix-GDDR5.jpg

AMD clocks the GDDR5 to 1250 MHz, regardless of dual-BIOS switch position. By creating a custom BIOS, or by using software tools, hardware enthusiasts can further tweak the performance of their Radeon HD 6990.



 

Comments 

 
# RE: Sapphire 100310SR Radeon HD 6990Robert17 2011-03-16 19:30
Long ago I came to the realization that as I continued to build, re-build, and enjoy computers as a hobby, as well as for work, that one constant would be in play: continuous performance improvements. This is just another of those "wow" products. There've been many, but this kinda stands out in it's own way. 6990. Can't wait for the 18125's. Hope I'm around that long.
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# RE: RE: Sapphire 100310SR Radeon HD 6990Olin Coles 2011-03-16 20:28
At the rate we're seeing overlapping improvements we'll see something twice as fast in less than two years.
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# Here we go againCom-Tek Chris 2011-03-17 07:51
I just ordered mine on the Egg about 3 minutes ago. I'll make my own personal comments after giving it a whirl in my personal world. I might be eating my words from previous posted comments, lol, oh well, as life goes.

to be continued..............
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# 256bit?zac 2011-03-17 21:25
Is this 256bit? Or 256x2bit?
And if it is only 256-bit video frame buffer, why? Or how? previously all dual gpu setups had 2x the memory controller.
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# RE: 256bit?Olin Coles 2011-03-18 08:14
Like the I explain in the article, this product has two GPUs on one PCB. Each GPU offers a 256-bit memory bus to the video frame buffer. Having two GPUs won't make single 512-bit lane, but will double bandwidth to 2x 256-bit.
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# AMD 6990 reviewsJ.King 2011-06-27 22:03
Correct me if I'm wrong but as far as I can tell ALL the 6990's are made in exactly the same place. IE the card's are all identical except for the stickers on the front. So why the price difference? This was true for the 6950's and 6970's until recently when a bait and switch was pulled by various manufacturers XFX comes to mind. The card's were changed (BIOS switch was removed and other less obvious changes) but the model number's remained the same and they were still being sold as reference.
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# RE: AMD 6990 reviewsOlin Coles 2011-06-27 22:09
You are mostly correct. There are some differences depending on what the partner pays for (cooling/BIOS/overclock), but the engineering is generally all done by the manufacturer. There are a few who receive the engineering and make their own PCB, but it's rare. As for pricing, you'll have to take that up with the brands and retailers.
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