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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 476

post #4751 of 6939
I'm buying a Gigabyte 6870 OC, (becasuse rma )
is it good doing oc? I'm reading that you can not touch the voltage , its true?


Sorry for my english :S
post #4752 of 6939
Quote:
Originally Posted by popita View Post

I'm buying a Gigabyte 6870 OC, (becasuse rma )
is it good doing oc? I'm reading that you can not touch the voltage , its true?


Sorry for my english :S

Exactly, you won't have any software volt. adjustmnent and its oc capabilities are limited, let's say unknown for sure (as allways). Excellent cooling however. smile.gif
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post #4753 of 6939
Quote:
Originally Posted by popita View Post

I'm buying a Gigabyte 6870 OC, (becasuse rma )
is it good doing oc? I'm reading that you can not touch the voltage , its true?
Sorry for my english :S

Well I cannot comment on the Gigabyte OC model, but my Sapphire Toxic will run at 1020Mhz with a slight voltage bump 24/7 and for gaming.

Can get it to about 1050Mhz for single bench runs on its own air cooling.
post #4754 of 6939
Quote:
Originally Posted by arrow0309 View Post

Exactly, you won't have any software volt. adjustmnent and its oc capabilities are limited, let's say unknown for sure (as allways). Excellent cooling however. smile.gif

Yes, i contacted Gigabyte themselves. Which they even said they planned a program but it was never actually released.. So happy i didn't get the Gigabyte model.. You can't even bios flash these cards to increase the voltage unlike older cards.. mad.gif
 
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post #4755 of 6939
But you cant do anything OC?
post #4756 of 6939
Have you tried using clocktweak to control voltage.
My newer sapphire card doesnt support voltage changing with trixx or afterburner and trying just crashes windows.
But it works with clocktweak up to 1.249V before it freezes.
There is a similar free version floating around called CMDATIGEN1 but it not as stable as clocktweak.
post #4757 of 6939
Hey guys!


This
I know this is for 5850/5870 but there might be a chance that it'd fit 68xx cards, what do you guys think?
 
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post #4758 of 6939
Quote:
Originally Posted by Matt-Matt View Post

Hey guys!
This
I know this is for 5850/5870 but there might be a chance that it'd fit 68xx cards, what do you guys think?

The 58xx and the 68xx cards have the same mounting holes, so it is likely that it will fit.
post #4759 of 6939
But the VRM areas are completely different.
post #4760 of 6939
Quote:
Originally Posted by bmgjet View Post

Just finished sticking 2X Antec 620s on my 2X 6850s.
[images]
Time to let the overclocking and over volting begin,
at stock clocks,
Both cards are idling 27C,
Max load is 47C and 48C on the old card.
VRMs hitting 51C and 53C on the old card.
Memory (at least thats what I think that temp is for) both at 25C.

Just a update on this,
Have now got Ram coolers installed. Only allowed me to go 8mhz higher on the memory tho before performances starts going down.
Re-applyed thermal compound on the VRM's and got a better side fan so they now stay under 40C.
Found that the bit of cardboard I had folded in half under the radiators to stop them vibrating with the fans had some how unfolded so it was in the 90 degree bend blocking half the radiator.
So fixed that and idle temps are now 23C with max load of 38-41C with furmark full load for 20mins.
In BF3 temps are around 32-35C.

Overvolting makes very little overclocking head room. 5mv = 1-2mhz more overclock on the core and the newer sapphire card Iv got will only do 1.249v before it freezes no matter what.
Max Overclock I've gotten stable on both cards is 1063mhz core 1148mhz memory. on 1.249V
Stock voltage (1.150v) it will do 1010mhz core. But im running 1.175v with a bios flash just so its a bit more stable and since temps are no problem.

May have to do a hardware voltmod to the newer card so I can push it to 1.3v and try get 1100mhz core like my older one does on 1.3V.
Which would give me a 35 Gpixel rate and a 52 Gtexture rate which would really help with 8X AA in BF3 (not that im having to much trouble staying over 120fps on the old maps anyway)
I am regretting not going with the 6870's a bit tho. If I had those with the clocks im getting they would be complete monsters. But I guess I did save $90 bucks getting the 6850's.

One thing I will say is the "Barts" core is fantastic value and may still give the 7850/7870s a run for there money.
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