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Different dimensions of the AMD Radeon HD 6990 graphics card

Last response: in Graphics & Displays
April 9, 2011 4:18:00 AM

Hi Everyone,

This is not a problem but more of a discussion of something I have noticed while researching components.
The length of the ‘Radeon HD 6990’ Graphics Card.

It seams different manufacturers have different lengths for the same graphics card. I know it might sound brainless to bring it up, but it seems to be an important factor whilst building a Computer.

Please let me illustrate for you:

Say I want to buy a LIAN LI PC-X500FX, the maximum video card size you can fit into the case is 315mm as stated on the LIAN LI website (

Now a Gigabyte ‘Radeon HD 6990’ dimensions is 318 – 126 – 38mm stated in their website (, clearly the GPU will not fit into the case.

But a PowerColor ‘Radeon HD 6990 dimensions is 305 – 110 – 38mm as stated in their website ( Will fit with very little room to spare, only a few millimetres to spare but the GPU will fit.

Maybe I am crazy, but I do believe these are important factors to consider when thinking of building your computer and reviewers do not seem report on this, like say they review two or three 6990 cards from different brands and they do a comparison of the same card, could they not mention the different sizes of the card? This could effect you decision on buying a brand from the other because of your case, set up or many different factors.

I have done an online search and have come up short with an answer, also why are they shorter or longer would that make a difference and if not why are they different in dimensions? After all AMD gives them the template to work with. Right?

This is not a rant I would just like to know what people think and if I am missing something.

Below I have put a few brands’ dimensions for the AMD 6990 GPU

Gigabyte = 318 – 126 – 38mm
MSI = 310 – 115 – 40mm
PowerColor = 305 – 110 – 38mm
Diamond =304.8– 101.6 – 40.64mm

Lian Li maximum video card size – 315mm
a c 106 U Graphics card
April 9, 2011 5:56:18 AM

As far as I know all 6990s are based strictly on AMDs reference design. AMD hasn't allowed AIBs to deviate from that, which is a shame since it would be nice if there was a 6990 that didn't remind people of the 5800 Ultra :o 
April 9, 2011 6:03:23 AM

So why do GPU brands have different dimensions on the same GPU card in this case the 6990.
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a c 546 U Graphics card
April 9, 2011 6:05:43 PM

GIGABYTE and MSI are probably specifying a length that is longer than its actual physical length so that there is enough space left behind the card to prevent blocking of the exhaust for the innermost GPU.

Reduces RMAs for overheating cards because someone didn't plan for the need for the internal exhaust port breathing space.
a b U Graphics card
April 9, 2011 6:10:08 PM

Yeah I don't know why manufacturers can't list the length of their cards in the specifications, it sure would help.
April 10, 2011 3:32:35 AM

"Yeah I don't know why manufacturers can't list the length of their cards in the specifications, it sure would help."

They do list the sizes, but they are all different for the same card by different brands thta is what we are talking about