Xfire

615 Views 11 Replies 8 Participants Last post by DomeD-, Nov 22, 2009

DomeD-

Discussion Starter · Nov 22, 2009

If i xfire a 4870 and a 4890 with it default to the lowest graphics card?
So it would be like 2 4870's

Save

1 - 12 of 12 Posts

Tator Tot

· #2 · Nov 22, 2009

Quote:

Originally Posted by DomeD-

If i xfire a 4870 and a 4890 with it default to the lowest graphics card?
So it would be like 2 4870's

No.

CrossfireX (unlike SLi) keeps the cards at the clocks they had before. It simply splits the work between the cards.

See less See more

Save

No, it would downclock the fastest card.
I've used 4890s of different speeds (much less different cards all together) and clocks were downclocked to the lowest clocked card. I dont know if they've fixed that since the 9.7 drivers but that was my experience.

Save

Twinnuke

· #4 · Nov 22, 2009

Hybrid Crossfire Downclocks.

Save

Enigma8750

· #5 · Nov 22, 2009

The above are correct

Save

meticadpa

· #6 · Nov 22, 2009

Quote:

Originally Posted by Tator Tot

No.

CrossfireX (unlike SLi) keeps the cards at the clocks they had before. It simply splits the work between the cards.

This is correct, all others wrong.

Together, it will give slightly better performance than just 4870 CrossFire, by around 5-10%.

See less See more

Save

Andr3az

· #7 · Nov 22, 2009

Just clock the 4870 to the 4890 speeds.
And yes.. It downclocks.

Save

kow_ciller

· #8 · Nov 22, 2009

Quote:

Originally Posted by Andr3az

Just clock the 4870 to the 4890 speeds.
And yes.. It downclocks.

Only problem is that most 4870s cant hit 4890 speeds stable. You can however hit a point where the 4870 is maxed out that could be close to a 4890.

See less See more

Save

Tator Tot

· #9 · Nov 22, 2009

Quote:

Originally Posted by Andr3az

Just clock the 4870 to the 4890 speeds.
And yes.. It downclocks.

NO it does not downclock.

CrossfireX does not downclock cards, this is why you are able to run a HD4870 in Crossfire with an HD4850 or HD4830 or HD4890.

All the clocks stay the same.

See less See more

Save

IdPlease

· #10 · Nov 22, 2009

I have a 4850 and a 4870 and have run them both in x-fire, and it never downclocked the 4870 to the 4850. Once my son has finished on his comp, i'll re-install the 4870 + 4850 in x-fire if need be and post screenies.

If I recall correctly (the 4850 has 512MB 4870 1024MB) it never dropped the 4870 to 512 either, but don't quote me on that, not 100% till I try it.

Here is an old screen shot of the 4870+4850 in x-fire.

See less See more