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HD 3870 VERY OVERCLOCKER FRIENDLY!!

Last response: in Graphics & Displays
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December 30, 2007 10:12:38 AM

Just bought a shiny new HD 3870 for $250 at frys and wow im amazed at how great it performs, sadly there are issues with crysis, but that aside it is a great OC'er was able to get it to 847 GPU(from 777) and 1404 Memory(or 2.808Ghz) (from 1126)

thats a 70mhz GPU increase and a whopping 556Mhz Memory increase, stable and games got a very nice increase.
Aslo on the note of OCing the HD 3870 i found it simple and didnt give me any problems if it happened to crash because i set the core/memory too high a simple restart and everything reverted back to normal.

I used Riva Tuner(of course) to overclock, temps around 50C load and 38C idle with %100 fan speed, Used the 7.11 drivers and no AA at 1280x1024 check out the FurBenchmark(will later post a 3dmark one but it doesn't seem to want to start-up)


http://img172.imageshack.us/img172/5660/computerbenchma...
December 30, 2007 10:36:51 AM

Hey thats a good overclock. It'lll be good to see some 3DMark benches. I can't wait until RivaTuner can o/c a CF setup, or ATITool worked in vista 64. The highest i could get the memory on my first card was 2700Ghz so you did very good there.
December 30, 2007 2:05:10 PM

Quote:
Your %100 fan speed its going to kill your card!


Please explain!

Best,

3Ball
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December 30, 2007 2:25:56 PM

I can't imagine that they are running the fan at 100% all the time. It'd be for benches only.

As for breaking the card i doubt it. Most good fans have a 300,000+ hour life on maximum settings. It'll wear out the fan for sure, but wont actually damage the card.
December 30, 2007 2:27:45 PM

Quote:
Trust me!

For a long run,keep your fan under 70%!!!!


I havent changed my fan speed. (I havent even installed the vid in my sig yet as I wont be back home to get to my system for another week), but I assume I may have to play with riva tuner to turn my fan up since the clocks are pretty high on this chip from stock, so that is why I am wandering. I dont plan to run @ 100%, but I was thinking 75 - 80% once it gets above 60 degrees and 65 - 70% once it goes above 55 then just let it run at stock below it, which I am not sure, but I have read it stays around 60% on idle or so.

Best,

3Ball
December 30, 2007 2:27:55 PM

LOL, 100% fan going to kill your card... thats a good one.
December 30, 2007 2:30:04 PM

closed_deal said:
I can't imagine that they are running the fan at 100% all the time. It'd be for benches only.

As for breaking the card i doubt it. Most good fans have a 300,000+ hour life on maximum settings. It'll wear out the fan for sure, but wont actually damage the card.


Nice OC on your 6000+.

Best,

3Ball
a c 195 U Graphics card
a b Ý World of Warcraft
a b } Memory
December 30, 2007 2:38:30 PM

I've defined four fan speeds for my HD3870 in Rivatuner; 25%, 40%, 60%, and 80%. It will only scale between two of them based on core temp, usually the 40% and 80%. The card starts up at 0% (after the initial whirr) then goes to 40% when it hits 40c. Ok, but then it never goes to 60%, jumping to 80% when it hits 55c. I can manually launch the 60% setting, but ONLY at startup, in which case it will scale back to 40% based on temps and then toggle between 40% and 60%. The 60% setting won't launch at other times. I can manually launch the 25% one too, on startup, but also not once any other setting has toggled.
I've futzed with it for hours, and have about had enough.
December 30, 2007 2:42:15 PM

Onus said:
I've defined four fan speeds for my HD3870 in Rivatuner; 25%, 40%, 60%, and 80%. It will only scale between two of them based on core temp, usually the 40% and 80%. The card starts up at 0% (after the initial whirr) then goes to 40% when it hits 40c. Ok, but then it never goes to 60%, jumping to 80% when it hits 55c. I can manually launch the 60% setting, but ONLY at startup, in which case it will scale back to 40% based on temps and then toggle between 40% and 60%. The 60% setting won't launch at other times. I can manually launch the 25% one too, on startup, but also not once any other setting has toggled.
I've futzed with it for hours, and have about had enough.


I have read that the rivatuner has problems getting the different fan speeds to work correctly on the 3870's currently. Im sure a new version of the program will fix this.

Best,

3Ball
December 30, 2007 2:54:53 PM

3Ball said:
Nice OC on your 6000+.

Best,

3Ball


Thankyou.

3Ball said:
I have read that the rivatuner has problems getting the different fan speeds to work correctly on the 3870's currently. Im sure a new version of the program will fix this.

Best,

3Ball


I can confirm this, i tried exactly the same thing and i can only get 25, 60 and 100%. As 3Ball has said i'm sure they'll resolve this issue with a revised version of RivaTuner or a Vista 64 version of ATITool.
December 30, 2007 5:08:56 PM

Yes, i can get %100 fan speed from Riva tuner, but i only do it when like i said i was benchmarking normally my fan speed is 65%

at %100 believe me that HD 3870 fan is LOUD very! but boy does it keep it cool.

im interested in any OC's you guys have achieved with this same card
December 30, 2007 5:18:36 PM

Mine are Sapphire stock 777/2250 have had one of them at 846/2702, but that was with Overdrive. RivaTuner and ATITool don't work some sort of kernal.dll failure :cry: .
!