HIS X1900 Crossfire Upgrade

[mcdermotx]

Lads,
thinking about buying a slave X1900 to add to my HIS Master card, but have an outstanding query....It'll be going into an ASUS P5W..
If I went ahead with a "normal" HIS X1900XT, is it possible to overclock both cards to XTX speeds (I already run the Master version at XTX level).
Or, do the relative XT+XTX speeds go out the window when you're running a Crossfire setup and both cards run at the speed of the Master..
Only bought the HIS recently, and while impressed by the raw speed of it compared to my old 7800GTX, I feel it could use a little help at 1920x1200 with some of the latest games when all effects are on....Call of Juarez etc..
Does anybody here have a similar setup and ran into some issues that I wouldn't be aware of ?

Cheers

 

[ACESHIGH]

If different speeds, then both cards will run at their own clock speeds (one card wont clock down to match the slower one).

 

[probedb]

If different speeds, then both cards will run at their own clock speeds (one card wont clock down to match the slower one).

Eh? I thought the faster card slowed to match the master card, so the XTX will slow to XT speeds when running in Crossfire mode?

 

[Darkwave]

Eh? I thought the faster card slowed to match the master card, so the XTX will slow to XT speeds when running in Crossfire mode?

No, that's how SLI works as I understand it. Crossfire cards stay at their native clocks.

 

[FrankJH]

No, that's how SLI works as I understand it. Crossfire cards stay at their native clocks.

No - you definitely can clock a crossfire setup, its a little more awkward (and has less oc potential than either single card Ive found) but it can be done

I had a 1100 3dmark06 point difference due to ocing on Cat 6.8's with my crossfire system

 

[kevpuk]

What's the best route to overclocking a crossfire setup (noob to crossfire )?

 

[FrankJH]

Very slowly and carefully

tbh I did it in CCC, you only have one set of sliders ( as mine were two XT's in effect it made no difference) but if you have one XTX its possibly not worth it - see what ATI tool is like as I believe the new version supports crossfire

 

[Darkwave]

No - you definitely can clock a crossfire setup, its a little more awkward (and has less oc potential than either single card Ive found) but it can be done

I had a 1100 3dmark06 point difference due to ocing on Cat 6.8's with my crossfire system

I didn't say you can't overclock in Crossfire. I said that if you run two differently-clocked cards in Crossfire (X1900CF and X1900XT-X) that neither will slow down.

When I said native I should have said specified I guess, but it what blatantly obvious what I meant because nobody mentioned OCing at all. We were talking about speed differences.

 

[kevpuk]

Very slowly and carefully

tbh I did it in CCC, you only have one set of sliders ( as mine were two XT's in effect it made no difference) but if you have one XTX its possibly not worth it - see what ATI tool is like as I believe the new version supports crossfire

Well my original card was the Sapphire X1900XT (happily ran beyond XT-X speeds on its own with no voltage adjustment ) and the Master is the ASUS model......thing is, in CCC after 'unlocking' the sliders are inaccessible, showing 621 for core (at both top and bottom) and (I think, from memory) 721 for RAM - no possibility to adjust This is in 6.9 and was the same in 6.8.....