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what is crossfire?

Pro Member First Officer
abmukh80 First Officer

Hi anybody here who uses ati crossfire technology?

Actually what I wanted to know is if I have a PCI-E slot, can I buy crossfire? Or is it a different technology altogether?

At the moment I have a ATI Radeon 256mb card which I wanted to upgrade to a 512mb card.

Which card do you think is the best in ATI 1900 series?

Please give your opinion

Cheers

Pro Member First Officer
anonymouse91 First Officer

Crossfire is just using more than one (usually 2) ATI cards together to improve performance. If a card is Crossfire capable, it just means you can use it with another Crossfire card. Nvidia call it SLI.

As for recommending a card, I'm not too good on that part so someone else can help you with that.

Pro Member First Officer
faust1200 First Officer

And if crossfire is the same concept as SLI it won't help your frames in FSX - if that is your goal.

Pro Member Captain
cheezyflier Captain

i am stuck with pci slot also Sad
my card is a nvidia geforce fx5500. i don't know if it would do SLI but it's about the strongest pci slot card i know of. it seems to offer decent performance for what it is.

Pro Member Chief Captain
RadarMan Chief Captain

faust1200 wrote:

And if crossfire is the same concept as SLI it won't help your frames in FSX - if that is your goal.

Wrong. SLI and Crossfire will work in FSX with SP1 if you crank up your resolution to 1920X1200 as per Phil Taylor.

If I'm wrong he will be by to correct me.

http://en.wikipedia.org/wiki/ATI_CrossFire

Radar

Pro Member First Officer
faust1200 First Officer

RadarMan wrote:

faust1200 wrote:

And if crossfire is the same concept as SLI it won't help your frames in FSX - if that is your goal.

Wrong. SLI and Crossfire will work in FSX with SP1 if you crank up your resolution to 1920X1200 as per Phil Taylor.

If I'm wrong he will be by to correct me.

http://en.wikipedia.org/wiki/ATI_CrossFire

Radar

Yep that is what I read also. I don't have a monitor that size so I forgot to consider that. It is possible to have enough pixels (apparently above 1920x1600) to have a GPU limited system (in fsx's eyes) where SLI could help.

From Pt's blog:
The main issue is FSX is CPU bound so the extra GPU doesn’t provide any benefit until fill rate, as determined by resolution and AA settings, drive past the CPU-boundness.

So SLI doesn’t benefit FSX much except at extreme resolutions with high AA. This is borne out by the review “Real-World Gaming CPU Comparison with 8800 GTX SLI”. This article proves at 19x12 or 25x16 with 16xAA on the Intel CPU, the fill rate requirement is high enough to counterbalance the CPU-boundness and show some benefit for FSX.

Also something to consider is that if you like to use 2 monitors while flying like I do, you cannot run SLI in multi-monitor mode.

Pro Member Chief Captain
RadarMan Chief Captain

faust1200 wrote:

RadarMan wrote:

faust1200 wrote:

And if crossfire is the same concept as SLI it won't help your frames in FSX - if that is your goal.

Wrong. SLI and Crossfire will work in FSX with SP1 if you crank up your resolution to 1920X1200 as per Phil Taylor.

If I'm wrong he will be by to correct me.

http://en.wikipedia.org/wiki/ATI_CrossFire

Radar

Yep that is what I read also. I don't have a monitor that size so I forgot to consider that. It is possible to have enough pixels (apparently above 1920x1600) to have a GPU limited system (in fsx's eyes) where SLI could help.

From Pt's blog:
The main issue is FSX is CPU bound so the extra GPU doesn’t provide any benefit until fill rate, as determined by resolution and AA settings, drive past the CPU-boundness.

So SLI doesn’t benefit FSX much except at extreme resolutions with high AA. This is borne out by the review “Real-World Gaming CPU Comparison with 8800 GTX SLI”. This article proves at 19x12 or 25x16 with 16xAA on the Intel CPU, the fill rate requirement is high enough to counterbalance the CPU-boundness and show some benefit for FSX.

Also something to consider is that if you like to use 2 monitors while flying like I do, you cannot run SLI in multi-monitor mode.

Glad you found that.
I have a monitor that can run it, Intel Core2Duo and Crossfire cards but I don't have SP1 installed yet.

Radar

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