280x crossfire help!

Shaunnnnnn · Oct 27, 2013

Hi guys,

Does anyone have any idea why one of my R9280x cards is listed as an 79XX series card instead of a R9280 card?

I currently have crossfire enabled and my 3dmark scores seem to indicate that crossfire is working. I just can't help but wonder whether the performance is affected by the system not being able to detect one of the cards as a R9280.

I've tried updating to the latest drivers but it doesn't change it.

Any help is much appreciated!

Thanks!

corvetteguy1994 · Oct 27, 2013

Do you have catalyst 13.11 installed?

Sakkura · Oct 27, 2013

The R9 280X is a rebadged HD 7970. It's not supposed to be that obvious, but it shouldn't matter. 7970s and 280Xs are confirmed to be fully Crossfire-compatible.

corvetteguy1994 · Oct 27, 2013

Yeah dont worry about it too much dude.

iam2thecrowe · Oct 27, 2013

probably need newer drivers. as others have said, its the same card anyway, but i would be checking the card itself and the box to make sure you got what you were sold. are they identical cards from identical manufacturers?

Shaunnnnnn · Oct 27, 2013

iam2thecrowe :

Thanks for all the replies guys!

Yup, both are gigabyte cards. I have the latest 13.11 drivers installed.

Will this result in any significant performance and/or stability issue?

Thanks guys!

corvetteguy1994 · Oct 27, 2013

Shaunnnnnn :

my main rig is in my signature and im running 13.11 with no issues what so ever. cant wait to see what else amd has in store.

Shaunnnnnn · Oct 28, 2013

corvetteguy1994 :

Shaunnnnnn :

my main rig is in my signature and im running 13.11 with no issues what so ever. cant wait to see what else amd has in store.

Thanks a bunch!

I decided to try installing the latest 13.11 beta drivers again and it seems to have fix the recognition issue - both cards are indicated as 280x.

corvetteguy1994 · Oct 28, 2013

Shaunnnnnn :

corvetteguy1994 :

Thanks a bunch!

I decided to try installing the latest 13.11 beta drivers again and it seems to have fix the recognition issue - both cards are indicated as 280x.

sweet good to hear its working now.

Shaunnnnnn · Oct 28, 2013

corvetteguy1994 :

Shaunnnnnn :

sweet good to hear its working now.

Thanks once again!

On a side note, is it ok that one card is running PCIe 3.0 while the other is running PCIe 2.0? (I'm using an MSI b85 g43 gaming mobo with an i5 4570) Will this configuration in any way affect Crossfire/Overall performance? (Max res I use is 1920 x 1080)

iam2thecrowe · Oct 28, 2013

Shaunnnnnn :

corvetteguy1994 :

Thanks once again!

On a side note, is it ok that one card is running PCIe 3.0 while the other is running PCIe 2.0? (I'm using an MSI b85 g43 gaming mobo with an i5 4570) Will this configuration in any way affect Crossfire/Overall performance? (Max res I use is 1920 x 1080)

i recommend reducing the pcie 3 card to pcie 2 speed if your bios allows it. the more even you get the performance between the cards, the less likely you will get micro-stutter.

Shaunnnnnn · Oct 28, 2013

iam2thecrowe :

Shaunnnnnn :

corvetteguy1994 :

Thanks once again!

On a side note, is it ok that one card is running PCIe 3.0 while the other is running PCIe 2.0? (I'm using an MSI b85 g43 gaming mobo with an i5 4570) Will this configuration in any way affect Crossfire/Overall performance? (Max res I use is 1920 x 1080)

i recommend reducing the pcie 3 card to pcie 2 speed if your bios allows it. the more even you get the performance between the cards, the less likely you will get micro-stutter.

Could I trouble you for a step-by-step guide to doing the above mentioned bios adjustment? Sorry, I'm a techno noob!

Thanks!

iam2thecrowe · Oct 28, 2013

Shaunnnnnn :

iam2thecrowe :

Shaunnnnnn :

i recommend reducing the pcie 3 card to pcie 2 speed if your bios allows it. the more even you get the performance between the cards, the less likely you will get micro-stutter.

Could I trouble you for a step-by-step guide to doing the above mentioned bios adjustment? Sorry, I'm a techno noob!

Thanks!

it's not necessary, see how it goes first, it might not be an issue. You would have to read through your motherboard manual or go into your bios and look for the option, not familiar with your motherboard.

Sakkura · Oct 28, 2013

Shaunnnnnn :

The second card is on a PCIe 2.0 x4 connection, which is not optimal. No matter what, you will be losing a few percent performance because of it.

Shaunnnnnn · Oct 28, 2013

Sakkura :

Thanks for all your replies guys!

Yup, I just read through my mobo manual and I realised that I've got only 1 PCIe 3.0 slot. Should have done more research into the mobo before commiting to it (it came highly recommended on my local GPU site forum).

I know it's probably not advisable, but should I upgrade to a mobo that has at least 2x PCIe 3.0 to fully utilise my 2x GPUs?

Thanks!

Sakkura · Oct 28, 2013

It's not just PCIe 3.0. It's that it's a 4-lane connection. PCIe 3.0 gives twice as much bandwidth per lane as PCIe 2.0, but 16 lanes is 4 times as much as 4. Anyway, a PCIe 2.0 x8 link (or equivalent PCIe 3.0 x4) should be sufficient for optimal performance. But I'm not sure buying a new motherboard would be worth it. Give it a try on your current motherboard first.

Shaunnnnnn · Oct 28, 2013

Sakkura :

Noted. Thanks Sakkura!

In the meantime, while I'm giving my current set-up a try, is there anything in particular I should monitor or keep an eye out for?

Oh and just for the sake of asking, what mobo would you recommend if the stars all aligned and Santa decided to coincidentally give me a new mobo for Christmas? Haha (I'm running an i5 4570)

Sakkura · Oct 28, 2013

Well, you could check the framerate or look out for any stuttering. But it's hard to measure accurately without special equipment.

Asrock Z87 Extreme3 is one of the cheapest boards that provides an x8 connection for each card in Crossfire.

280x crossfire help!

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