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My 5970 thinks it's card no1

HAL9000

HAL9000

Lifer
Hey everyone,

I've got two ati cards that I want to crossfire together, a 5970 and a 5870 but my 5870 registers as GPU number 1 and my 5970 as GPU 2 regardless of what pcie slot I put it in,

I've tried
5970: slot 1 16x - 5870 slot 2 1x
5970 slot 1 8x - 5870 slot 2 8x
5970 slot 1 16x 5870 slot 3 4x
5970 slot 2 8x 5870 slot 2 8x
5970 slot 2 1x 5870 slot 1 16x
5970 slot 3 4x 5870 slot 1 16x


Little help?

Edit title: 5970 thinks it's card 2
 
Everythread I see about crossfire problems seems to be with the 5970 + 5870 cards.

Im gonna give you the advice I give all of the others.... sell the 5870, be happy you got a 5970 (thats like 480+50% performance), and should handle more or less anything you throw at it.
 
Arkadrel said:
Everythread I see about crossfire problems seems to be with the 5970 + 5870 cards.

Im gonna give you the advice I give all of the others.... sell the 5870, be happy you got a 5970 (thats like 480+50% performance), and should handle more or less anything you throw at it.
Click to expand...

Yup you posted that in my last thread, at least your consistent!
 
neckarb said:
hmm I thought you had to have the more powerfull card as number 1
Click to expand...
i don't think so. Perhaps your MB's BIOS is out of date.

At any rate, make sure the HD 5970 is in the x16 PCIe slot - you should be good to go with CrossFire-X

First, run the HD 5970 by itself on a few game benchmarks or Vantage; then run it together with HD 5870 in CF-X and see what kind of performance improvement you get. It should be a decent improvement if everything is scaling properly.
 
apoppin said:
i don't think so. Perhaps your MB's BIOS is out of date.

At any rate, make sure the HD 5970 is in the x16 PCIe slot - you should be good to go with CrossFire-X

First, run the HD 5970 by itself on a few game benchmarks or Vantage; then run it together with HD 5870 in CF-X and see what kind of performance improvement you get. It should be a decent improvement if everything is scaling properly.
Click to expand...

Ok guys, figured it out, the best performance I get is... for some reason... the 5870 in slot 1 16x and the 5970 it slot 3 4x, I ran a load of benchmarks before and after in each slot, and this way definately worked out best... Don't know why, don't care why.. 🙂 thanks for your input all.
 
Ben90 said:
The 5870 is the more powerful GPU unless you have a decent overclock on your 5970
Click to expand...

That's not quite true, it's the same GPU (but only one of them) and it's running at slower speeds without an overclock, and I have overclocked to match the speeds in any event.
 
neckarb said:
Ok guys, figured it out, the best performance I get is... for some reason... the 5870 in slot 1 16x and the 5970 it slot 3 4x, I ran a load of benchmarks before and after in each slot, and this way definately worked out best... Don't know why, don't care why.. 🙂 thanks for your input all.
Click to expand...

If your performance is best with HD 5970 in a 4x PCIe slot, your system is messed up

😵
 
apoppin said:
If your performance is best with HD 5970 in a 4x PCIe slot, your system is messed up

😵
Click to expand...

Yeah i lose about 5% having it in 4x but it just made the airflow in my computer better so I could overclock higher without it overheating....
 
neckarb said:
Yeah i lose about 5% having it in 4x but it just made the airflow in my computer better so I could overclock higher without it overheating....
Click to expand...

You are going about it wrong.

HD 5970 in PCIe x16 slot
HD 5870 in PCIe x16 or x8 slot

Then make sure the airflow is good in your case. If not make it so. You have close to $1000 worth of graphics cards. Don't mickey mouse it
:'(
 
apoppin said:
You are going about it wrong.

HD 5970 in PCIe x16 slot
HD 5870 in PCIe x16 or x8 slot

Then make sure the airflow is good in your case. If not make it so. You have close to $1000 worth of graphics cards. Don't mickey mouse it
:'(
Click to expand...

I don't have a 16x and an 8x at the same time.
 
What, 8x + 8x?

That is reasonable for performance. But you really should have both the HD 5970 and the HD 5870 each in an 8x slot. Your case should also have excellent airflow and monitor your temps for long life especially if you OC.

It is a shame that there is so little space in some MBs between multiple video cards.
 
apoppin said:
What, 8x + 8x?

That is reasonable for performance. But you really should have both the HD 5970 and the HD 5870 each in an 8x slot. Your case should also have excellent airflow and monitor your temps for long life especially if you OC.

It is a shame that there is so little space in some MBs between multiple video cards.
Click to expand...

Yeah I can do 8x/8x but then the cards are practically touching, and they get rather hot, in an ideal world things would be different, but with what vie got this is the best setup 🙂
 
neckarb said:
Yeah I can do 8x/8x but then the cards are practically touching, and they get rather hot, in an ideal world things would be different, but with what vie got this is the best setup 🙂
Click to expand...
What about reversing the cards; putting the HD 5870 in the 4x slot and the HD 5970 in the 16x slot. The 5970 is the stronger card with the higher bandwidth and it makes sense to give it the least restrictions.
😕
 
apoppin said:
What about reversing the cards; putting the HD 5870 in the 4x slot and the HD 5970 in the 16x slot. The 5970 is the stronger card with the higher bandwidth and it makes sense to give it the least restrictions.
😕
Click to expand...

Yeah I tried that and when it boots the driver fails. No idea why,
 
neckarb said:
Yeah I tried that and when it boots the driver fails. No idea why,
Click to expand...
if this were my issue, i would fix it before proceeding. Something is definitely not right and you are losing performance the way it is set up.

What MB do you have? Is the BIOS up to date? All the very latest chipset drivers?
 
Good point I'll have a look into it again I. The morning, I think I know what the problem is I had to install one graphics card at a time for some reason, it's a Mac Pro (please don't let this turn into a Mac bashing thread)
 
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