Crossfire with different gpu's?

XxXEpicSauceXxX · Oct 27, 2013

I have a AMD 7870 (stock) and I was thinking about buying myself a 7990 for an upgrade. What I was wondering is, am I able to crossfire a 7990 with my 7870?

Lots of people say no but some say yes with a catch, is there somebody who can tell me honestly?

If I can't crossfire a 7990, what is better?: 7870 x2 (crossfired) or 7990?
Thanks in advance ~Epic

ksham · Oct 27, 2013

You cannot CrossFireX a HD 7990 with a HD 7870. You can only CrossFireX or SLI if the GPU is the same across the cards.

And a HD 7990 > HD 7870 CF.

Deus Gladiorum · Oct 27, 2013

XxXEpicSauceXxX :

You can't crossfire between performance brackets. In other words, for CrossFire (but not for SLI) you can combine any GPUs with the same first two digits. So you can combine an HD 7870 with an HD 7850, or an HD 7950 with an HD 7970, but you can't combine an HD 7990 with an HD 7870.

The HD 7990 is already two GPUs in CrossFire, they're just fitted onto one card. But it's still two GPUs, and it comes with the problems associated with CrossFired cards, that is microstuttering, which makes game play feel jaggy even when fps is high. Because of this, I wouldn't recommend the HD 7990, especially because the R9 290X exists.

The R9 290X beats a GTX Titan nearly across the board. The best part is, it's very affordable, even more affordable than a GTX 780, coming in at $580. The R9 290X is easily the best single card solution available right now in terms of performance, and the price is phenomenal since it's nearly half the cost of a Titan.

ksham · Oct 27, 2013

@Deus Gladiorum: that's not exactly accurate. The numbers don't dictate whether or not the cards can run in CrossFireX configuration, the GPU does. For example, you can CrossFireX a HD 7870 XT with HD 7970. And you can CrossFireX a HD 7950 with R9 280X. You can also CrossFireX a HD 7970 with HD 7990 because the HD 7990 is essentially two HD 7970 run in CrossFireX configuration.

Since the HD 7990 is already in CrossFireX configuration, I don't recommend pairing it in a 3-way CrossFireX configuration. Anything above two do not scale well.

XxXEpicSauceXxX · Oct 27, 2013

Deus Gladiorum :

XxXEpicSauceXxX :

You can't crossfire between performance brackets. In other words, for CrossFire (but not for SLI) you can combine any GPUs with the same first two digits. So you can combine an HD 7870 with an HD 7850, or an HD 7950 with an HD 7970, but you can't combine an HD 7990 with an HD 7870.

The HD 7990 is already two GPUs in CrossFire, they're just fitted onto one card. But it's still two GPUs, and it comes with the problems associated with CrossFired cards, that is microstuttering, which makes game play feel jaggy even when fps is high. Because of this, I wouldn't recommend the HD 7990, especially because the R9 290X exists.

The R9 290X beats a GTX Titan nearly across the board. The best part is, it's very affordable, even more affordable than a GTX 780, coming in at $580. The R9 290X is easily the best single card solution available right now in terms of performance, and the price is phenomenal since it's nearly half the cost of a Titan.

Thanks for your instant fast replies and about the R9 290X and it has me hooked! Do you think it is worth it? Also, how long will it last until it becomes out dated (run games on medium to low settings on ultra end games like bf4 and games like it). Thanks!

ksham · Oct 27, 2013

The R9 290X just released. It should last for a few years. You may have to turn the settings down on future games, but it should work just fine.

XxXEpicSauceXxX · Oct 28, 2013

ksham :

Thanks for your help! I guess I got my answer

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