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Can you Dual Crossfire 4870 X2

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September 8, 2008 7:30:31 PM

I know with NVidia you can have 4 graphic cards in SLI. Is that true with ATI crossfiring?

Next question if you had $2200 to spend on 4 ATI 4870 X2 for one computer. Can all of them work together in Crossfire mode. Then would a Thermaltake 1200w Toughpower be enough power with Raid 10 Enabled (4 VelcoRaptors), and 9450 CPU, and (12) 12cm case fans.

If so what Motherboards support 4 PCI-Exress 2.0 16x slots?

More about : dual crossfire 4870

September 8, 2008 7:45:59 PM

sli can only be done with 3 cards not 4.
no they will all not work unless the drivers r optimized for it, which there not and will not be any time soon. cf and sli r still new and slowly becoming mainstream. most recent games and future games r able to use 2 gpus let alone over 4.
not many support 4pcie but the mobo i have supports 4pcie "msi p6n diamond."
September 8, 2008 7:58:39 PM

The only ones that I know of that have 4x PCI-X2.0 are AMD boards (Spider Platform)(Phenom + 4x PCI-X16 slots for X-fire). Question is WHY?

Edit, Also everything I have seen shows X-Fire, and SLI are degraded by 3, or 4 cards (.5% to 10% gain over 2 cards) and it slows the system down.
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September 8, 2008 7:58:51 PM

SLI & Crossfire both work with GPU but SLI will only do so with a 9800gx2. But I would not recommend getting dual 4870X2 because the scalling on 4 gpu really sucks. you might want to save that money and get a newer card in a year or so. and you don,t want to get a Q9450 since the Q9550 is 10-20 bucks more.
a b ) Power supply
September 8, 2008 8:08:33 PM

You can only use 2 4870X2s in crossfire giving you a 4 GPU setup, also known as Crossfire X or quad Crossfire by some. Remember each 4870X2 is a board made out of two 4870s with 1GB of memory each and a custome PCI-E switch to improve efficiency. Currently you can't use 4 4870X2s since the drivers only support 4 GPUs at the moment, not 8. Not only that each 4870X2 only has one crossfire connector, and they would each need to have two in order for you to connect 4 of them, which would give you 8 GPUs. Honestly though I think that two 4870X2s is just an insane amount of power as it is.

Just so you know Sli doesn't work with 4 cards, but it can power 4 GPUs. Using 2 9800GX2s you get 4 GPUs of power and that is what Quad SLi is.
a b ) Power supply
September 8, 2008 8:24:39 PM

yaoiboimi said:
I know with NVidia you can have 4 graphic cards in SLI. Is that true with ATI crossfiring?

Next question if you had $2200 to spend on 4 ATI 4870 X2 for one computer. Can all of them work together in Crossfire mode. Then would a Thermaltake 1200w Toughpower be enough power with Raid 10 Enabled (4 VelcoRaptors), and 9450 CPU, and (12) 12cm case fans.

If so what Motherboards support 4 PCI-Exress 2.0 16x slots?


You would need a 790FX motherboard and a Phenom 9850 CPU. There are no motherboards for Intel CPUs with 4 PCI-E x16 slots.
You would also need TWO 1200W PSUs for that setup - the second one handling cards #3 and #4.
I don't know if the drivers support more than 4 GPUs either, call AMD support and ask.

With nVidia, the best you can do is 780i or 790i with 3 GTX 280 cards and a Q9450 and a Toughpower 1500W PSU.
September 9, 2008 7:49:29 PM

When did Thermaltake Release a 1500W Toughpower? I thought the 1200W was their :sol:  most recent Release, and they are 87% efficient. I know 1500W and 2000W are yet to come out. I saw a video of some of the new technology coming out from thermaltake such as I can't wait for the the Freon Cooling system when it hits the market I am going to buy it.
September 9, 2008 8:32:16 PM

aevm said:
You would need a 790FX motherboard and a Phenom 9850 CPU. There are no motherboards for Intel CPUs with 4 PCI-E x16 slots.
You would also need TWO 1200W PSUs for that setup - the second one handling cards #3 and #4.
I don't know if the drivers support more than 4 GPUs either, call AMD support and ask.

With nVidia, the best you can do is 780i or 790i with 3 GTX 280 cards and a Q9450 and a Toughpower 1500W PSU.



my mobo which supports intel has 4 pcie slot. msi p6n diamond.
September 9, 2008 8:59:26 PM

invisik said:
my mobo which supports intel has 4 pcie slot. msi p6n diamond.


With that mobo which is this Im assuming: http://www.msicomputer.com/product/p_spec.asp?model=P6N...
And I dont believe they make these anymore.

With 4 video cards: X8+X8+X16+X8

A better choice would be this: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
But you cant SLI on this one.

But most importantly, Why bother with 4 video cards?
(Unless you building a number crunching machine)
September 29, 2008 1:40:44 AM

That'd make an awesome brute force cracker if you used stream computing. 790FX is 4xPCIe @ x8.

Why does everyone carry on about CUDA like its something amazing and new when Stream was released ages ago?
September 29, 2008 3:07:24 AM

tj_the_first said:
That'd make an awesome brute force cracker if you used stream computing. 790FX is 4xPCIe @ x8.

Why does everyone carry on about CUDA like its something amazing and new when Stream was released ages ago?


+1.
September 29, 2008 10:17:39 AM

Kaldor said:
With that mobo which is this Im assuming: http://www.msicomputer.com/product/p_spec.asp?model=P6N...
And I dont believe they make these anymore.

With 4 video cards: X8+X8+X16+X8

A better choice would be this: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
But you cant SLI on this one.

But most importantly, Why bother with 4 video cards?
(Unless you building a number crunching machine)


having more pcie is always better. currently i have 2 gtx260 and im planning to get a weaker card just to run physics. already 3 slots gone.
=]
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