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how to overclock when you card is in crossfire?

post #1 of 10
Thread Starter 
i was overclocking my card a lil bit but my computer always crashes. how do i do it? i was also adjusting my 5870 volts in sapphire trixx and increasing 10mhz at a time. still crashing.

also my card to the top 5870, when its idle, its temps is 46-48C compared to my toxic 5850 24C.
question
1. should i put my 5850 on the top nad 5870 on bottom?
2. can my 5870 still my main card even if i put it in bottom?
3. how do i overclock 1 card at a time when in crossfire mode?
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post #2 of 10
Quote:
Originally Posted by tiramoko View Post
1. should i put my 5850 on the top nad 5870 on bottom?
It will make no difference.
Quote:
2. can my 5870 still my main card even if i put it in bottom?
The main card is the one which is connected to your monitor. Orientation dosnt matter unless your board states other wise (Like mine)
Quote:
3. how do i overclock 1 card at a time when in crossfire mode?
What program are you using? Some times its "hidden" but you can switch between which card you want to OC in Ocing software
Edited by StuffStuff1 - 3/3/11 at 9:27pm
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post #3 of 10
There should be a dropdown menu in CCC in which you can switch between the cards
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by StuffStuff1 View Post
It will make no difference.
is the temp will remain the same even if i put the 5850 on the top?
Quote:
Originally Posted by nibnab View Post
There should be a dropdown menu in CCC in which you can switch between the cards
the problem is 5870 has only 900mhz max and also i want to use sapphire trixx for my 5850 cause i want to use the voltage control. mine is non-ref card
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post #5 of 10
if your case is properly cooled you may see a difference of maybe 1,2,or 0°C

it makes little difference.
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by StuffStuff1 View Post
if your case is properly cooled you may see a difference of maybe 1,2,or 0°C

it makes little difference.
because i've read the top gpu is hotter than the bottom card
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post #7 of 10
Quote:
Originally Posted by tiramoko View Post
because i've read the top gpu is hotter than the bottom card
I ones read the world was flat....



Do you see where im going here
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post #8 of 10
afterburner allows you to OC one card at a time... maybe trixx could do the same.
Problem is you are probably not going to get a good OC without trixx because AB won't give you voltage tweak for the toxic.



volts are not everything onwhen overlcocking AMD gpus.

for example, my 5870 @ 1000mhz will crash with 1.31v, but it is stable at 1.25 because of the temps.

The lower your temps, the less voltage you need (and the lower the voltages, the lower the temps)
and vice versa.

You need to find a sweet spot between temps and voltage.


If you want results, put both of your cards' fans running at 100%. it will sound like a jet, but you can see it for your self
post #9 of 10
Quote:
Originally Posted by tiramoko View Post
because i've read the top gpu is hotter than the bottom card


that's true, but when both cards are on the same size and near each other.
your 5850 is smaller than the 5870, but I don't know: does it blocks the air entrance for the upper 5870?

anyways, if they are close (unlike in my p55ftw board, whereas there is a 2 lane gap between both cards) putting the toxic on top will not be a goo didea, because the fan will have a hard time blowing air into that card
post #10 of 10
Quote:
Originally Posted by EduFurtado View Post
that's true, but when both cards are on the same size and near each other.
your 5850 is smaller than the 5870, but I don't know: does it blocks the air entrance for the upper 5870?


His has a gap between the cards.

And even if it didnt the weakest of fans would solve any heat issues.
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