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Gonna Pencil Mod my 3870s - Page 2

post #11 of 13
Thread Starter 
Quote:
Originally Posted by whe3ls View Post
1.4-1.5 just stay under 1.55-1.6 unless you have the cooling
Thanks!

I will be using the stock cooling and so far I have had no issues with it. Always stays under 60c with the fan at 100% when benching so I should have some room to play with.
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The Ark
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post #12 of 13
Quote:
Originally Posted by SyncMaster753 View Post
i don't know much about pencil modding beyond the theory but have you tried any 3870 bios editors, they'll let you set specific numerical values for voltages and frequencies with none of the guesswork.

voltage increases don't work on the hd3870's. Only the hd3850's benefit from the voltage increase from the bios editor. The editor doesn't surpass the limit of 1.325v, you need to hard mod it.
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post #13 of 13
Thread Starter 
Well I tried the pencil mod and after spending a couple hours on it I finally gave up.

I was actually able to pencil in enough for 1.50 VCore on two of them and 1.51 on the third and get stable clocks of 931MHz on all three cores. When I overclocked my Phenom to run 3DMark06 it locked up so I guess everyting was pulling to much juice. So I decided to unplug all unnecessary comppnents which included three hard drives, 1 CD/DVD drive, all but one case fan (out of 6) and try it again with a fan blowing directly on the open pc to help cool it. It would not recognize all three of my cards after the reboot. I switched each card around and all three worked fine. Rebooted several times and rechecked the VCore to make sure they were still the same. So I finally gave up. Had to start some homework anyway.

I guess reaching 18000+ with three cards and a Phenom is not going to happen...
The Ark
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The Ark
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AMD FX-8350 ASUS M5A99FX PRO R2.0 PowerColor AX7870 2GBD5-M2DH G.SKILL Ripjaws 4GB DDR3 1600 
RAMHard DriveHard DriveHard Drive
CORSAIR XMS 8GB DDR3 1600 OCZ Vertex 4 VTX4-25SAT3-256G WD 750GB Black WD 500GB Black 
Hard DriveOptical DriveCoolingOS
WD 1TB Green Lite-On 20x LH-20A1L ZALMAN CNPS9900MAX-R 135mm Windows 8.1 Pro x64 
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