Why am I getting better performance with 1 R9 Fury than with 2 r9 fury's?

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Alex_404

Commendable
Jan 14, 2017
6
0
1,510
Hey guys,

I have been driving my self crazy looking for answers to this one. And it is probably so simple that that's why there is no answer out there. But I am overlooking it.

But here it goes. I am getting way better performance with 1 R9 Fury(sapphire nitro tri-x OC) than with them in Crossfire. I am running my games in 2k on high-ultra settings. When I run crossfire I am getting 30-60 fps and with one card I am getting 120-200 fps. It does really depend on the game. Either way it games way better with one card than with two. I am assuming it has to do with my set up. I started building my pc with the thought of running dual 480x's. But the r9 fury went on sale and I jumped on it. I am guessing I need PCI gen 3 for the bridgeless crossfire. Which I can not find an answer on whether or not that bridgeless crossfire requires gen 3 or not.

But here is my setup
fx8350 @ 4.6
Crosshair V formula z (Bios version 2201)
2 R9 fury sapphire nitro (BIOS Version 015.049.000.016)
16 gb g skillz 2133
samsung 850 SSD
Deepcool assassin 2
Seasonic 1050w PSU

For some reason my PCI express 2.0 is running Slot 1 x8 and slot 3 x16. Which is weird because they are supposed to be dual x16 2.0.

I have uninstalled and reinstalled crimson more times than I can count. I have cycled through 16.12.1, 16.12.2, and 17.1.1
I have removed each card and tested them individually and they work great alone and separately in each x16 slot. I have made sure they are seated correctly.
I have removed my wireless adapter in pci x1 slot.
I can not choose what gen or lane amounts(x4,x8,x16) in my bios
I have reset my bios to factory defaults over and over.
I have tested it on Kombustor to make sure that both GPUs go under full load. And they do. They test appx 16000 in crossfire.

I have come to the conclusion that I am just bottlenecked at my motherboard and CPU.

I am about to buy a i7-5820k and new mobo and ram to start a new setup with these cards to make sure.

If any body has any better ideas that would be great.(p.s. I can provide pictures of my bios and my monitor results from gaming)

Thanks!
 
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Mikel_4

Mikel_4

Respectable
Oct 15, 2016
712
0
2,660

    ■ Software side, started there and ended there, looks like AMD+developers are beginning to abandon AM3 + Radeon core, as reviewers inform, the AMD AM3 CPUs lost the power consumption racing against Intel's CPUs.
    ■ You can start by clean and re apply TIM on graphic card, also use identical thermal pad (thickness), I'm not aware of your graphic card's thermal pad thickness, usually 1.5mm or 2mm thick are commonly use. I suggest contacting Sapphire to find out.
    ■ Max out your case air flow, tidying clattered cables+better fans or even add case fan.
    ■ Slot_1 is at 16x (PCIE 2.0) even when slot_2 or slot is occupied, this is following AMD 990FX PCIe generation bandwidth specification where PCIe Gen 3.0 graphic card installed on PCIe Gen 2.0 slot there will be bandwidth drop. But I don't think bandwidth is the issue for crossfireX setup, remember that crossfire minimum PCIe 3.0 is 4x, so on your crossfire, the actual speed is at two PCIeX8 3.0 (according to slowest lane). Is that the bottleneck? contact Asus, Sapphire, and AMD.
    ■ I consider Fury GPU is good for non gaming, especially video editor apps, they love massive stream processors, friend of mine told me its faster than GTX 1060 on Sony Vegas, if you know video editor guy, offer him.
 
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A

Alex_404

Commendable
Jan 14, 2017
6
0
1,510


1. Yes I agree, I was hoping to be ok with the lower end performance because of the cost.. I think I regret it.
2. I definitely won't be taking apart my cards. I still have warranty on them.
3. I have a 1 fan on front, 2 side intakes and 2 exhaust in the back. I think that covers it.
4. I have been in contact with Sapphire, haven't gotten useful answers yet. But at least a reply. I have not heard back from AMD, and just got a reply from Asus. Yes the motherboard is supposed to be capable of handling crossfire. But the specifications to handle crossfire were Pre bridgeless crossfire technology. XDMA. So without the bridge, all of the information is being passed along via PCI express. Here is why I am unsure if I am bottlnecked there. But I have been unable to find out if there is a min requirement for bridgless crossfire. My single card has a min requirement of PCI express 2.0 x16. Just for one. So the assumption is I would need a minimum of 2 PCI 2.0 x16 for crossfire. But then I am not accounting for the lost of transfer bandwidth via the bridge. Here is my predicament. Is the HBM pushing that much memory that fast to be bottlencked with dual PCI 2.0 x16?
5. I am very pleased with the performance of the one card individually. They are super fast. I just have problems and need it super extremely fast and super awsome. Ya know?

So I have decided to upgrade. I am getting a i7 5930k with a msi x99 gaming pro carbon, trident z ram, and an nzxt water cooler. If my system is hauling series balls at that point I might just have to Office Space some stuff.

Appreciate the reply. If you come across some solid answers for the a minimum requirement for Bridgless crossfire that would be great.
 
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