R7 265 Crossfire!

[xXNomyXx]

Ahoy Linustechtips community!

 

I'm rather confused with this issue, I currently run a single R7 265. It's able to run most if not all my games at a reasonable frame rate and detail.

The best example I can give would be BattleField 4 can play in Ultra at about 40-50 FPS stable.

Upon setting up crossfire with two R7 265s the frame rate changes to about 75-80 however will drop to 15 every few moments. Making it pretty much unplayable.

 

My main card overclocks like a dream, runs perfectly fine. Running the second card I purchased on it's own still results in a stuttery game play with the same settings.

 

I'm fairly sure the second card has a defect, if so I'll just return for a refund. But if it's something I can sort out I'll give it a try!

If anyone has any suggestions as to what the issue is that would be great!

 

The second R7 265 was purchased as I've not had the first R7 265 for long and unfortunately my money tree hasn't fruited yet...

[SkilledRebuilds]

Rest of your PC's specs..?

In detail please.

To determine if its @ optimal performance or if anything is amiss.

[Sauron]

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Welcome to the forum! Please follow your topics

 

Are you sure the second card is plugged in at least a pcie 2.0 4x slot? The bus width might be bottlenecking it. As @SkilledRebuilds said, please provide more information

[xXNomyXx]

AMD 4100 @ 3.6Ghz

Asus sabertooth 990fx r2.0

8GB Kingston HyperX Beast

R7 265 (Two cards, one installed)

256GB San Disk SSD (OS)

500GB WD Blue
500GB WD Enterprise Black

Dual 21.5" monitors. (DVI)

 

The drivers are all up to date 14.9.

They both plug into a 16x slot, so it would be running in 8x 8x with crossfire bridge.

[Lord Pantaloons]

Welcome to the forum! Please follow your topics

 

Are you sure the second card is plugged in at least a pcie 2.0 4x slot? The bus width might be bottlenecking it. As @SkilledRebuilds said, please provide more information

There's no way a 265 can saturate a x4 even a PCIe gen 2

[SkilledRebuilds]

There's no way a 265 can saturate a x4 even a PCIe gen 2

Actually it does, not a lot, but a little.

My 270x<-close enough........ compared on PCIE 3.0 x16 vs PCIE 2.0 x4 has a few FPS on average loss in all titles I tested.

Might be nothing to care about, but everyone doesn't share the same opinion.

[Deletive]

I think it's more your CPU then GPUs.

[xXNomyXx]

I think it's more your CPU then GPUs.

 

The CPU usage while running tests appeared to be perfectly fine

[Deletive]

The CPU usage while running tests appeared to be perfectly fine

AMD CPU's have FPS dips usually... Have you tried overclocking it. it might help a bit.

[Lord Pantaloons]

Actually it does, not a lot, but a little.

My 270x<-close enough........ compared on PCIE 3.0 x16 vs PCIE 2.0 x4 has a few FPS on average loss in all titles I tested.

Might be nothing to care about, but everyone doesn't share the same opinion.

That can easily be choked up to bench run variances that can be caused by any number of factors. Though there's no reason to argue about it since it's not relevant, the OP isn't running it in an x4 slot.

 

 

@OP try a fresh driver install before you do anything else, you also should not be running the two cards at a clock difference of more than 80Mhz as that can cause stuttering.

[xXNomyXx]

That can easily be choked up to bench run variances that can be caused by any number of factors. Though there's no reason to argue about it since it's not relevant, the OP isn't running it in an x4 slot.

 

 

@OP try a fresh driver install before you do anything else, you also should not be running the two cards at a clock difference of more than 80Mhz as that can cause stuttering.

I'll have a stab at it! Thanks

[Sauron]

There's no way a 265 can saturate a x4 even a PCIe gen 2

 

When it's sharing all of its vram with another card through the bus, yeah it can. By itself it's probably not a problem, but when the crossfire kicks in it's a completely different matter.