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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 471

post #4701 of 6939
Quote:
Originally Posted by bmgjet View Post

Just finished sticking 2X Antec 620s on my 2X 6850s.

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.

I'd be worried about that memory, try some benchmarks and touch the RAM chips, even with heatsinks on my RAM, it's hard to touch them...
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post #4702 of 6939
Thats what iv just finished doing, Memory feels warm to the touch and never got hot during a run though 3d mark 11.
My inferred thermonitor wouldn't pick up any temp at all off them tho so they must be very close to the temp of the air coming out of the radiators.

They do have more air flow then stock tho since the radiator fans are 3X 3K rpm 102CFM ones and they are blowing directly on the cards.
And I have another 120mm 3K rpm fan blowing from the side on to the VRMs and memory.
Can say under load its not the quietest rig iv had lol.
Iv got a new case in the pipe line tho that will have sound deadning in it and air ducting from out side my room to take air in and let it out.
post #4703 of 6939
Quote:
Originally Posted by bmgjet View Post

Just finished sticking 2X Antec 620s on my 2X 6850s.
img0308zp.jpgimg0311gv.jpg

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.

+1 Rep
Man, that's awesome! thumb.gif
Might be interested in getting one for my Hawk (gpu1). How did you manage to fix the main block (wb) to the gpu? Did you use zip ties? tongue.gif
Edited by arrow0309 - 1/15/12 at 10:35pm
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post #4704 of 6939
Zip ties and thermal adhesive with 1/4 MX2 thermal grease mixed in so its easier to take off in in the future if needed.
Just been playing with the overclocking.

With stock coolers I could only get 938mhz stable and 945 with it recovering from a error every 10-20mins with furmark. Even tho temps never went over 77c.
So far iv gotten to 975mhz and it hasn't artifacted or recovered from a error with the 30min run I just finished so going to try 980mhz. This is on the stock voltages as well and temp has only gone up 1C on the older card and still the same on the newer one.

Havnt started overclocking the ram tho but will give it a go later on since its harder to test them for stability.

Looks like these 6850's like to be run cool. Im surprised I could get another 37mhz (so far) with just a cooler change and not touching the voltages.
post #4705 of 6939
For as long as I keep my main 6850 cooled below 74ºC it wont crash nor artifact.
My second 6850 has memory from Elpida which is a completely different brand when in comparison to the memory used in my main 6850, so that ones crashes cause of mem getting way too hot when overclock'ed.
But basicly if I keep the cores below 74ºC I can keep them stable at 1Ghz Core
post #4706 of 6939
Quote:
Originally Posted by Tokkan View Post

For as long as I keep my main 6850 cooled below 74ºC it wont crash nor artifact.
My second 6850 has memory from Elpida which is a completely different brand when in comparison to the memory used in my main 6850, so that ones crashes cause of mem getting way too hot when overclock'ed.
But basicly if I keep the cores below 74ºC I can keep them stable at 1Ghz Core

Yes, that is the magic number for 6850/6870 cores. Both of my cards do that too, i actually found it rather strange?
Oh well, they don't go past 74c anymore. thumb.gif
 
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post #4707 of 6939
Thanks to your advices, got some new refreshing colours (not only) & fans (R4's) inside my rig: smile.gif

450
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PS: The 6870 Hawk is about to be undressed (shroud removed) again, this was only for the photo session. tongue.gif
Edited by arrow0309 - 1/19/12 at 6:25am
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post #4708 of 6939
Quote:
Originally Posted by arrow0309 View Post

Thanks to your advices, got some new refreshing colours (not only) & fans (R4's) inside my rig: smile.gif
450
450
450
450
450
450
PS: The 6870 Hawk is about to be undressed (shroud removed) again, this was only for the photo session. tongue.gif

Looks great .The ugly brown is gone but how are your temps?
How about a pic with less light so we can see the fans better?
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post #4709 of 6939
Quote:
Originally Posted by smoke420 View Post


Looks great .The ugly brown is gone but how are your temps?
How about a pic with less light so we can see the fans better?

The cpu temps are the same, still testing, got the KM2 1700rpm central fan but no third fan. I may wanna reseat the D14 changing the thermal grease or at least the tim spread (I made an X). Or simply return to the Coolaboratory Liquid Ultra.
The vga1 temps are improoved, maybe I don't even have to remove the shroud anymore, and this because of the two R4's in push (one is frontal) I suppose. thumb.gif
I only have these pics but I'll make some more soon.

And they're silent enough too, undervolted.

PS: How come the two (front and vga) Kaze Master Fan1 R4's only get 1710-1740 rpm displayed meanwhile the other two (sys fan2) manage to achieve at 100% (max speed with the Speedfan) 1839-1859 rpm?
Edited by arrow0309 - 1/19/12 at 9:27am
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post #4710 of 6939
hey i am thinking of getting either a radeon 6870 or a atx 550ti can u tell me which to buy and what the difference in performance is?
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