can a r9 285 crossfire?

[Mr.Reggin]

Can the Asus r9 285 Strix 2GB GDDR5 Crossfire? If yes, does it need a CF bridge?

[Jobbe03]

Yes and no.

[TheSLSAMG]

Yes, it can. No, it doesn't utilize a bridge.

[samcool55]

Of course it can crossfire. Bridging is going through the pci-e slots so no extra bridge needed. 

[Mr.Reggin]

Of course it can crossfire. Bridging is going through the pci-e slots so no extra bridge needed. 

does it matter if the mobo runs gen 2.0 or gen 3.0?

[H4X3R]

does it matter if the mobo runs gen 2.0 or gen 3.0?

Nope

[Mr.Reggin]

Nope

na dann.

[samcool55]

does it matter if the mobo runs gen 2.0 or gen 3.0?

Nope, Should all be fine! It's possible you have a very very tiny performance loss if you use a card in 4X on gen 2.0. But that's just a very small amount.

All other things should be just fine. 2.0 8X or up, or 3.0 4X or up. all good.

[Mr.Reggin]

Nope, Should all be fine! It's possible you have a very very tiny performance loss if you use a card in 4X on gen 2.0. But that's just a very small amount.

All other things should be just fine. 2.0 8X or up, or 3.0 4X or up. all good.

can i run Crossfire with it, having theoratically 16x and 4x on Gen 3.0 (Gigabyte GA-Z97)

[DJ_Deedahx]

Does PCI-E 4x, 8x, 16x and whatever affect the overall performance of the PCI-E peripheral you're using, e.g. GPUs? Because I will need to install a wireless network adapter with my probably GTX 750 Ti/760 and my CPU (Intel Core i5 Haswell) has a mere 16 PCI lanes, because HASWELL

[samcool55]

Haswell can run max 1x8 and 2x4. With some plx chips magic can happen but overall on gen 3.0 platforms. It's all fine! As long as the gpu's are also pci-e 3.0 of course

 

@Mr.Reggin yes you can run crossfire without losing any performance

 

@DJ_Deedhahx it will have an effect on the lanes that the gpu's get from the cpu. But with haswell it doesn't matter. It will be just fine and there will be no performance decrease.

edit: that's only for SLI, if you run a single card, nothing will change for that card.

[Mr.Reggin]

Does PCI-E 4x, 8x, 16x and whatever affect the overall performance of the PCI-E peripheral you're using, e.g. GPUs? Because I will need to install a wireless network adapter with my probably GTX 750 Ti/760 and my CPU (Intel Core i5 Haswell) has a mere 16 PCI lanes, because HASWELL

okay thanks for the info

[DJ_Deedahx]

@DJ_Deedahx it will have an effect on the lanes that the gpu's get from the cpu. But with haswell it doesn't matter. It will be just fine and there will be no performance decrease.

edit: that's only for SLI, if you run a single card, nothing will change for that card.

Get me a little clearer on this... Let's say I had an Intel Core i7-4770K with two GTX 780's in SLI. (And both of the cards are running at 8x) If I add another PCI-E peripheral (such as a PCI-E SSD, for example, which I am NOT likely to buy), will the PCI lanes configuration change to the cards being both run at PCI-E 4x and the SSD at 8x?

This is rather confusing, I'll have you know!

[KyonCoraeL]

okay thanks for the info

Let us know how it goes if you decide to crossfire r9 285s. I only found one benchmark article online. It would be nice to get another perspective.

[samcool55]

Get me a little clearer on this... Let's say I had an Intel Core i7-4770K with two GTX 780's in SLI. (And both of the cards are running at 8x) If I add another PCI-E peripheral (such as a PCI-E SSD, for example, which I am NOT likely to buy), will the PCI lanes configuration change to the cards being both run at PCI-E 4x and the SSD at 8x?

This is rather confusing, I'll have you know!

I understand your confusion and it depends on which order they are plugged in, the top pci-e will always run at 16x if there is no other pci-e device, if there is another pci-e device it will run at 8X

The middle one will run at 16X if there is no other pci-e device(read note), run at 4X if there is a pci-e device in the top one, or 4X if there is a pci-e device in the lowest one

the lowest pci-e device will always run at 4X

 

note: the middle pci-e slot will only run if the slot iself has all the pins of a 16X pci-e slot, it is quite common the middle slot is only wired for 8X. So even if it can run theoretically 16X, there is a chance only 8 laes are  wired and the other 8 lanes don't have pins to connect.

 

So if you have 2 780's in top and middle slot, and a pci-e device in the lowest one. Top 780 runs at 8X, middle 780 at 4X and pci-e device 4X. 

[Mr.Reggin]

I understand your confusion and it depends on which order they are plugged in, the top pci-e will always run at 16x if there is no other pci-e device, if there is another pci-e device it will run at 8X

The middle one will run at 16X if there is no other pci-e device(read note), run at 4X if there is a pci-e device in the top one, or 4X if there is a pci-e device in the lowest one

the lowest pci-e device will always run at 4X

 

note: the middle pci-e slot will only run if the slot iself has all the pins of a 16X pci-e slot, it is quite common the middle slot is only wired for 8X. So even if it can run theoretically 16X, there is a chance only 8 laes are  wired and the other 8 lanes don't have pins to connect.

 

So if you have 2 780's in top and middle slot, and a pci-e device in the lowest one. Top 780 runs at 8X, middle 780 at 4X and pci-e dev

 

Let us know how it goes if you decide to crossfire r9 285s. I only found one benchmark article online. It would be nice to get another perspective.

I assume that the r9 285 wont be bottlenecked, since gen 3.0 4x is ok for a middle class gpu

[KyonCoraeL]

 

I understand your confusion and it depends on which order they are plugged in, the top pci-e will always run at 16x if there is no other pci-e device, if there is another pci-e device it will run at 8X

The middle one will run at 16X if there is no other pci-e device(read note), run at 4X if there is a pci-e device in the top one, or 4X if there is a pci-e device in the lowest one

the lowest pci-e device will always run at 4X

 

note: the middle pci-e slot will only run if the slot iself has all the pins of a 16X pci-e slot, it is quite common the middle slot is only wired for 8X. So even if it can run theoretically 16X, there is a chance only 8 laes are  wired and the other 8 lanes don't have pins to connect.

 

So if you have 2 780's in top and middle slot, and a pci-e device in the lowest one. Top 780 runs at 8X, middle 780 at 4X and pci-e dev

 

Let us know how it goes if you decide to crossfire r9 285s. I only found one benchmark article online. It would be nice to get another perspective.

I assume that the r9 285 wont be bottlenecked, since gen 3.0 4x is ok for a middle class gpu

 

My interest in R9 285 crossfire is the xdma technology. How well does the framerating or fps variance compare to a single card GPU. Typically, the variance is alot higher with crossfire and SLI GPUs. The closest example of this xdma technology benchmarked for this framerating was from pcper and the R9 290x in crossfire or the R9 295x2. However, I feel that perhaps the variance could be alot lower because there is so much excess bandwidth in the PCI-e lanes compared to the R9 290x.