Crossfire Question: 3 fans with 2 fan card / Crossfire spacing

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SuperRipeOrange

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Dec 7, 2014
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Hi Guys,

I built a new PC and I have a Sapphire Pulse Radeon RX 580 8G dual fan card sitting around with an Asus Rog Strix rx580 8gb (3 fan) in the case. I was wondering can 3 fan and 2 fan cards be crossfired together. Does 1 fan become redundant?

To get a better understanding here are links to the respective products:
https://www.amazon.co.uk/Sapphire-Pulse-Radeon-GDDR5-Graphics/dp/B071CQ5LRV/ref=sr_1_1?s=computers&ie=UTF8&qid=1536268046&sr=1-1&keywords=rx580 - SAPPHIRE

https://www.amazon.co.uk/ASUS-ROG-STRIX-RX580-T8G-GAM-Radeon-Express-Graphics/dp/B071QXSGGP/ref=sr_1_6?s=computers&ie=UTF8&qid=1536268046&sr=1-6&keywords=rx580 - ASUS

What will suffer if I was to add the sapphire card into the mix gpu wise? I'm wondering in relation to speed and cooling. I was looking to buy 2 of the asus cards and sell the sapphire but my Corsair 750D case and Gigabyte ab350 gaming 3 mobo don't look like they'll be able to support the 2 asus ones. THEY ARE HUGE CARDS!!!!

What sort of space would I need between cards? I've tried to measure it and it looks like they'll be very close to touching if not slightly touching. I know the top card would suffer cooling wise and operate at a higher temperature. I only have the stock fans which came with the case and they work well at the moment. Would any cooling solution solve this?

I know its a lot to read :p feel free to move this to the right place I thought it was best suited to Graphics Cards...

Thanks a lot for the help everybody!


 
Solution
Rogue Leader
Yes they can be crossfired. The number of fans has no relevance to their ability to crossfire.

Whichever card is slower dictates the speed. So if your 3 fan card normally runs at 1800mhz and the 2 fan runs at 1750, both will run at 1750. Unless you overclock.

On that board you should use the two slots with metal around them, yes it makes for a tight squeeze when cooling but its fine, they draw air in and exhaust upward.
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Rogue Leader

Rogue Leader

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Yes they can be crossfired. The number of fans has no relevance to their ability to crossfire.

Whichever card is slower dictates the speed. So if your 3 fan card normally runs at 1800mhz and the 2 fan runs at 1750, both will run at 1750. Unless you overclock.

On that board you should use the two slots with metal around them, yes it makes for a tight squeeze when cooling but its fine, they draw air in and exhaust upward.
 
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Solution
Eximo

Eximo

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The fans are irrelevant to the crossfire specification, so not it won't randomly decide to turn off fans... Each card will operate independently when it comes to temperature.

You can always overclock/underclock the cards manually to get them to match. Though it will default to the slowest clock frequencies.

Cooling wise I would put the ASUS card on the top so that third fan can at least get some airflow to the card.

In terms of spacing, that is up to your motherboard. You'll typically only have one good option. You can use a 4x slot, but they are typically at the bottom of motherboards and require a case with at least 8 PCI expansion slots to use. Typically with late model motherboards you will have 3-slot spacing starting from the second PCIe slot. (blank, GPU/GPU/ blank GPU/GPU blank). On high end boards that support Tri SLI and Crossfire you are packing the cards in and do have the option of two empty slots between GPUs.

Only times physical spacing matters is when you are trying to place cards right next to each other in the triple SLI/Crossfire configs. Then the cards must stay within the two slots width. There are plenty of cards out there that creep into a third slot or outright demand one.
 
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