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Dual Radeon hd7770's on a ga-990fxa-ud5 although run x16 by x16 or x16 by x8

Last response: in Graphics & Displays
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August 8, 2013 5:50:20 PM

Basically I have both my cars in the x16 slots although thier is only one slot between them allowing for little airflow. But the next card down is x8

So I was thinking of one (getting a super strong fan that blows from the side) then it will allow the most cool air to get in between the two cooling shrouds which is about a couple mm space. currently i run the fans at 100% and on idle they are fine (or low usage like browsing etc) at 35-40c

Now the question also is If i placed the second card in the x8 slot (i believe the crossfireX cable is long enough erk) will I suffer from a bottleneck in speed from the card to the sb?

So should i buy that loud and strong side fan? (will have on control and game with headphones so noise inst much of a matter) or put my second card in the x8 slot? Just looking for the best way cool this system.

Right now i am happy with its performance i can play whatever i want but i got a feeling that will stop soon as its been more than a year with 7770s but when that stops ill be getting a single card (just easier)
August 8, 2013 6:08:48 PM

As long as your x8 PCI-e slot is 2.0 or newer, you shouldn't notice an impact in performance from moving one of your cards to it. For that matter, I doubt a 7770 would be able to fully load up a 4x slot to see the ~5% or less slowdown there.
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August 9, 2013 1:59:43 PM

bigpinkdragon286 said:
As long as your x8 PCI-e slot is 2.0 or newer, you shouldn't notice an impact in performance from moving one of your cards to it. For that matter, I doubt a 7770 would be able to fully load up a 4x slot to see the ~5% or less slowdown there.


Well i checked and i have 2 x16 slots but the crossfire adapter will only reach the x16 and x8 connected if i use the second x16 slot. Is this possibly my motherboard is pcie express 3.0

So if i put the main card in the second x16 slot and the second card in the x8 slot will it work on my system?

Also i normally game in 720p with my 27 in monitor

Thank you for your help and i hope to get this working the best possible
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August 9, 2013 3:44:20 PM

If you have to move both cards, do you actually gain any clearance between them? There wouldn't be a point unless you gained something.

I don't know what PCIe revision your motherboard is. I don't know what you're running, however, if it's AMD based then there is no native chipset support for PCIe 3.0, yet, although at least one manufacturer has used a bridge chip to add PCIe 3.0 support on a 990 FX motherboard. The problem boils down to there not being enough bandwidth to run all of those lanes at full bandwidth to the processor, so it becomes a moot point for AMD right now.
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August 10, 2013 3:09:34 PM

bigpinkdragon286 said:
If you have to move both cards, do you actually gain any clearance between them? There wouldn't be a point unless you gained something.


Yes you are correct idk what i was thinking it doesn't do anything beneficial and yes IDK why i said the Motherboard was PCIe 3 because its not the card could if their was one but the Board is PCIe 2.0.

Now I have decided to spend the least amount of money to make this system work better. is (TELL ME IF I MAKE A STUPID IDEA!! OR SOMETHING COMPLETELY WRONG!!)

So knowing none of my other ideas would so jack! according to my next idea i thiunk knowing the following will make it easier. The rest of my system first the case its a cooler master elite plus 1. My CPU has a AIO water cooling solution have it placed on the rear of my system in a pull configuration from inside the case, My case also has a already cut 92 mm fan slot cut into the left side (it is also acrilic so i can make it 120 mm although IDK if that would be needed) I also have a fan controller although i dont know how much power it puts out per 3 pin connector i would ideally like to use that it is an Aerocool Touch- 1000.

So the ultimate idea is to Upgrade my system cooling which would entail (populate each slot with largest possible/ best preforming fans) Adding another to the CPU cooler, another top fan, a bottom fan, and then get the regulated side fan and mount with custom air duct Fan must be regulated AFAIK their is no 4 pin fan regulators? but i have a 3 pin regulator so fan suggestions would be appreciated for a 3 pin or a 4 pin controller. Experiment with removing the fan shrouds using the side fan for cooling. Wont the system freak out if i remove the fan plug from the card?

I would love to cool these cards better currently I just dont understand the design of this sort of thing sadly i wont be able to afford a new video card for another year (this system is a little over a year) LOL that is if anyone wants to trade for my radeon 7770s? :sarcastic: 

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Best solution

August 10, 2013 5:18:28 PM

Well, any card above what you're currently running is still going to produce plenty of heat under load. There really isn't a good air cooled solution to your problem, which is why multi-card configurations often times consider going with water cooling. The downside is the cost, and the fact that most water cooling solutions for graphics cards are not generic, and thus, as you upgrade the card, you need to switch water blocks with it.

You might ask yourself though, am I having problems with my graphics cards due to the heat, and will I experience problems before I would have upgraded anyway? I wouldn't want to spend too much energy trying to solve a trivial problem, if you don't have to.

I think your lowest cost solution would be to find a longer CrossFire bridge cable online and order that. Will probably cost in the neighborhood of $10, and then you would be able to separate your cards better and just be done with it. :-)
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August 11, 2013 3:04:34 PM

bigpinkdragon286 said:
Well, any card above what you're currently running is still going to produce plenty of heat under load. There really isn't a good air cooled solution to your problem, which is why multi-card configurations often times consider going with water cooling. The downside is the cost, and the fact that most water cooling solutions for graphics cards are not generic, and thus, as you upgrade the card, you need to switch water blocks with it.

You might ask yourself though, am I having problems with my graphics cards due to the heat, and will I experience problems before I would have upgraded anyway? I wouldn't want to spend too much energy trying to solve a trivial problem, if you don't have to.

I think your lowest cost solution would be to find a longer CrossFire bridge cable online and order that. Will probably cost in the neighborhood of $10, and then you would be able to separate your cards better and just be done with it. :-)


my first idea was going to be buying a water block for the cards but i soon learned that ati 7770s has a design which makes the standard block design impossible so i saw that and got into this.

First i didn't KNOW THEY MAKE long Bridges so i think that's my solution! That is if i can use the cards that way? placing the main card in the PCIe x16 slot and the linked card in the x8 slots. I have read it has been done but that's with motherboards with that as the only option as i am skipping a x16 slot for air in my situation.

So as soon as i make some measurements and know this is the way to go (i have read, old information though, that running a card in an x8 slot you wont notice a difference at all from x16 is that true or what kinds of loss might i get?) Ill be ordering one from ebay for like 8 bucks i believe.
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August 11, 2013 3:51:10 PM

You won't notice the difference until the card becomes bandwidth starved. A 7770 can't saturate a PCIe 2.0 x8 slot. :-) I would be surprised if even a 7970 would see enough difference to warrant against that configuration.
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August 11, 2013 5:59:53 PM

bigpinkdragon286 said:
You won't notice the difference until the card becomes bandwidth starved. A 7770 can't saturate a PCIe 2.0 x8 slot. :-) I would be surprised if even a 7970 would see enough difference to warrant against that configuration.


Now i am going to buy the longer bridge and also get a nice cooling fan to cool them both nicely with your help i will gain one slot of airspace

Its odd the type of cooling these cards use they are basically a card with a heat sink the has a fan mounted on a shroud that directs the air over the heat sink but with no clear exit pathway. IMO this design should not be a crossfire enabled card i just wish i knew that in hindsight. (actually in hindsight unless i want to but dual top of the line cards, line none better, i am not wasting my time with CF/SLI unless its a needed situation.) IDK why the cards are not an intake and exhaust type of card even though they have an CF bridge port i wont only build Crossfire cards in one of 2 ways either the way they already do it and create an intake system with a shroud that exhausts the air out the back, (this would probably be an aftermarket thing IMO) vga air coolers that have wrap around heat pipes so the fan can be located on the bottom of the card or on top in a standard case. LOL kinda crazy lol
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August 13, 2013 3:55:38 AM

The cooling of graphics cards leaves a lot to be desired. Why nobody has engineered a form factor including a ducted fan leading to outside the chassis for each graphics card is beyond me. Why anybody would want the warm, inside air of a computer to flow over an already hot graphics card is beyond me. All the years spent engineering super duper graphics chips, and we can't get better cooling? Makes me both laugh and get mad at the same time. :-)
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