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R9 290X and 290 Blog: modernizing multi-GPU gaming with XDMA

About time bridges were done away with. One niggling question though...

As it is all done over the pci bus now, what if any effect does clocking the nuts off of the bus (remeber intel chipsets now run all buses from the bclk, including memory and pci bus speeds) have on 290+ multi card setups?

I'm thinking more of x79 where 130mhz+ bus speeds are common.
 
Agreed! I'd lost the bridge for my first multi-GPU system and went crazy to find a replacement.

To be completely honest with you I'm not sure; but I think it will be limited by the PCIe bus (based on how much you oc them).
 
Warsam71 said:
Hello almighty
Are you experiencing the black screen issue? We did release a new WHQL driver (13.12) recently which has helped with the problem. Have you tried it?

Here is the link: http://support.amd.com/en-us/download/desktop?os=Windows+7+-+32
(note the above link is for Win7 32-bit)
Click to expand...

Yes I did try it..... Made no difference at all.

So I went to Nividia for the first time and they've made you guys look silly with how effortless the hardware and software installation was.
 
pgi947 said:
About time bridges were done away with. One niggling question though...

As it is all done over the pci bus now, what if any effect does clocking the nuts off of the bus (remeber intel chipsets now run all buses from the bclk, including memory and pci bus speeds) have on 290+ multi card setups?

I'm thinking more of x79 where 130mhz+ bus speeds are common.
Click to expand...

A good question and I am curious also.
 
If even the basic old bridge gives an extra 900mb/s of bandwidth, why not just change it's use, or improve it to increase its bandwidth?
I'm thinking of even current 3-4 card setups that show decent improvements going from pcie2.0 to 3.0
I would have thought the next gen or 2 of cards would need all the bandwidth they can get
 
I have three AMD 290's and can't boot into Windows with them - permanent black screen. I've tried the latest drivers, the oldest drivers, the drivers in between, a new motherboard, a new power supply, new risers, different ports in the motherboard.

Funnily, my 280X's run perfectly fine in exactly the same setup.

So as almighty15 said in his first post, a blog post explaining why AMD aren't addressing these issues would be appreciated.
 
flopper said:
Hardocp thought as much also.:)

4k gaming is coming faster than expected IMO.
Click to expand...

:cool:

andybird123 said:
If even the basic old bridge gives an extra 900mb/s of bandwidth, why not just change it's use, or improve it to increase its bandwidth?
I'm thinking of even current 3-4 card setups that show decent improvements going from pcie2.0 to 3.0
I would have thought the next gen or 2 of cards would need all the bandwidth they can get
Click to expand...

I'm glad they've done away with it. The new implementation seems to work very well and no more ugly crossfire bridges!
 
andybird123 said:
If even the basic old bridge gives an extra 900mb/s of bandwidth, why not just change it's use, or improve it to increase its bandwidth?
I'm thinking of even current 3-4 card setups that show decent improvements going from pcie2.0 to 3.0
I would have thought the next gen or 2 of cards would need all the bandwidth they can get
Click to expand...

I will be firing up all four of my 290Xs in the same PC in the next few days so the PCI-E bus will be getting some serious action.:D
 
Warsam71 said:
Agreed! I'd lost the bridge for my first multi-GPU system and went crazy to find a replacement.

To be completely honest with you I'm not sure; but I think it will be limited by the PCIe bus (based on how much you oc them).
Click to expand...

Would be interesting to see some results of various bus speeds on both pci 2 & 3 to see what if any difference it makes.

My main concern would be those benching on the edge of stability, if it would force the user to run a slower bus and in turn lower cpu and memory clocks just to keep crossfire stable in something like firestrike.
 
pgi947 said:
Would be interesting to see some results of various bus speeds on both pci 2 & 3 to see what if any difference it makes.

My main concern would be those benching on the edge of stability, if it would force the user to run a slower bus and in turn lower cpu and memory clocks just to keep crossfire stable in something like firestrike.
Click to expand...

Kaap did a test on heaven, difference was a few percent. But i expect it might be a bit more on other things, nothing too dramatic though.
 
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