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View Full Version : Overclocking question.

Casheti
10-04-2007, 09:47 PM
Using TechPowerUp's GPU-Z I have discovered that only my X850XT has been overclocked, and not my Crossfire Edition.

Have I been creating problems for myself by clocking the slave faster than the Master?

Thing is.. I can't choose which one to OC. ATi Tray Tools doesn't give that option.
panchoman
10-04-2007, 09:48 PM
nope, x-fire will always run based on the weakest/slowest card. same goes for sli and raid.
Casheti
10-04-2007, 09:49 PM
I don't understand, are you saying OC'ing the slave and not the master is okay?

Both Cards have same stock clocks.
sneekypeet
10-04-2007, 09:50 PM
I have thought about this myself with my SLI setup...The only real way to OC both cards is to individually test them. Find a good number for both cards core/mem , and flash both to those clocks.

Cant really see it doing any harm as long as the clocked card handles those speeds!
Hawk1
10-04-2007, 09:50 PM
I think for Crossfire they run at whatever the lower cards clock speed is (ie-you can crossfire a 1950xtx with a 1900 crossfire master, but will they will both run at the 1900's speed). I don't think it has any ill effects.
Casheti
10-04-2007, 09:51 PM
Lol but my point is they're not both running at the same clocks, one is faster than the other.

Isn't that bad?
Hawk1
10-04-2007, 09:54 PM
Lol but my point is they're not both running at the same clocks, one is faster than the other.

Isn't that bad?

Performance wise, yeah, your not getting the use out of the one OC card when in crossfire. Hardware wise they will be fine.

I think there was a way to overclock both for crossfire, but not sure how (I dont OC my GPU). I think Damulta would know.
panchoman
10-04-2007, 09:55 PM
sli operates @ the speed of the slowest one.
Casheti
10-04-2007, 09:56 PM
Yes but it is not operating at the speed of the slowest one, people please understand, they are running DIFFERENT clocks.

I guess I may as well just push the slave back down to stock and call it a day.
ace80
10-04-2007, 09:59 PM
Can't you oc both your x850's using ati tool? Settings>Use Device - select card

Its what i do and seems to work.
http://img.techpowerup.org/071004/sm009.jpg
Casheti
10-04-2007, 10:01 PM
I will try ATi Tool instead and see what happens.
sneekypeet
10-04-2007, 10:02 PM
hey cash why not do as i suggested and clock them individually to find a good max that both will do well , then flash those speeds to the cards?
Casheti
10-04-2007, 10:03 PM
Ha I don't trust myself flashing, I don't fancy bricking anything.

And Fuse-Wire wants to buy my PC, so I don't want to mess it up for him. :p
Casheti
10-04-2007, 10:12 PM
Okay so if I use ATiTool to OC each card individually, do both card's clocks get saved in one profile?
ace80
10-04-2007, 10:15 PM
no, you have load that profile to each card individually.
Just make sure each card can handle the clocks
Casheti
10-04-2007, 10:16 PM
Right-O. Thanks.
ace80
10-04-2007, 10:19 PM
Also 3d detection will not work, as it can't do it for both cards.
So every time you game or bench load them manually