Multi-Core+CrossfireX OC

[cats_Paw]

Hi,
I have the following system:
Mobo:Asus Rampage Formula
CPU: Q6600 OC 3.005 (Asus Utility)
RAM: Corsair DMX 4GB (2x2GB modules) 800MHZ 4-4-4-12
Sound Card: X-Fit Titanium Retail version
Tv Tuner: Aver Media
HDD:1 samsung 500GB spinpoint , 2 Samsung Spinpoint 750GB in Raid0
Watercooled CPU:Thermaltake Kandalf LCS Case
GPU:2 4850 in crossfire config from sapphire with thermaltake DuOrbs (all copper) iDLE from 29-50 C(depends on room temp) load 68 C max.
Fans:1 250MM side fan (4.8W/2.4A),6 120MM fans (2 LED 4 normal,total under 15W, dunno Amps), 2 92MM fans (No info), TMG thermaltake fan and slotfan (2.4W and dunno the 2nd 1).
PSU Thermaltake thougthpower 750W (Noise level is inaubile so i doubt its a power issue since fan is loud at full load)
Now i got an issue that really bothers me, i cant OC my GPUs, if i do, games dont have artifacts till 690/1150, but after some time they crash, some with error messeges, some with none.
Since i Use Vista Basic 32-bit, the information is basicly useless. Also sometimes i get BSOD or Black screens.

I wonder if anyone can give me information about this problem, if its a power problem, compatibility, etc.

P.S Catalyst 9.2

 

[cats_Paw]

OH sry i forgot, when i auto tunned my cards, first card went to 690/1180, second to 635/1010 so im sorta shocked, anyone know if oc in crossfire is buggy or something?

 

[richardscott]

have you checked your cpu for stabilty useing prime95 or occt or orthos? if not do it first for 8hrs.

i have two hd4870's and one can oc the memory loads and the other can oc the core loads but because they cant oc the same ammount i have to settle with only 775 and 975. use ati tool to properly oc ure cards you might find you can take them both much higher.

 

[jonpaul37]

Using software for overclocking is never a safe option, it's unstable at best, try taking the OC off, then hitting the GPU OC, see if you get the same results...

 

[cats_Paw]

same results with CPU non OC and GPUs OCED 8(

 

[richardscott]

try not to oc gup's as much and also use ati tool to scan for artifacts as its much better and faster than playing a game.

 

[dingumf]

Remember they're two different cards so maybe one can overclock further than the other.