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4890 XFire

Yer im almost certain its the PSU after doing some trouble shooting. Im gonna buy a Corsair 850WATT PSU and sell this one, ill post a thread conclusion when i can afford to buy the new PSU! cheers for your help.
 
hmmm well im pretty frustrated now. Just got my new Corsair 850W power supply (should be enough by miles) and the computer still hangs like before =(. So it wasnt the PSU!

Im almost certain it must be related to Bios settings now... If i run the CPU and Voltages at stock it runs fine... but obviously this defeats the object as this means running my processor at 2.66 rather then 3.5 which it easily reachs otherwise.

Perhaps somebody can shed some light on where i may be going wrong as im no overclocking expert. The only bios settings i change is as follows:-

CPU Host Control: ENABLED
CPU Host Frequancy: (increased to desired amount)
Memory Multiplier: 2.00B (which leaves RAM running at 876, its the lowest multiplier i can select)
CPU Voltage: 1.3V (from 1.1)
(G) MCH Overvoltage control: +0.100
FSB Overvoltage: +0.10V

any help and comments on how these settings could make the system repeatedly crash please let me no. Bare in mind it is 100% stable without the other graphics card in!
 
Its a shame you went straight to replacing the PSU. I read on the Corsair site that they were happy that a HX620 would run a 4870X2 fine. My experience with Crossfire is that heat can be the issue. Check to see if one GPU is much hotter than the other when under load.
 
I believe AMD recommends a decent 650watt for HD4890 crossfire, I think the powersupply may not be delivering, don't mean to say its faulty, depends what else its powering

mine comes out at about 700watts :eek: apparently
 
i replaced the PSU! lol thats the problem.

I think it may be related to heat. The temps dont go very high even under load like really only 75ish.

But i took one of my front facing intake fans and used it as a side case fan pointing at the gfx cards and so far 10 mins into crisis and no crashes when it usually crashes within 30 secs... ill see how i get on
 
just use ccc to configure the fan speed. if you put them up to 100% and see what temp you get and then slowly work back you find the optimal speed. Mine is on 65% and the temp is as good as if it was at 100%

On Idle I'm around 45 degrees as before when it was on auto it was about 65 degrees.
 
Not to be a bum, but you shouldve done more research 650w PSU is fine for 2x4890's. The manufacturers speccs are outer their ***.

When i had my 2x4870's they never went over 350/380 on load, and a 4890 is what max 40w mnore than a 4870? Cant be arsed to do any research at this time but you get my drift :)

Edit: I'm tired and grumpy so dont quote me on this :P
 
ahh well... to be fair other people thought the same on here...

didnt end up paying much for the upgrade anyway.... after flogging the other.

wont need to upgrade psu anytime soon anyway!

seem to have resolved my issue, mite flog these 4890 now and get a 5870 :P woo


TY all
 
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