View Full Version : whats with my HIS 4870???
overclocking101
09-17-2009, 05:49 PM
ok i have a powercolor 4870 clocks to 850/980 stock cooling and no voltmods.
and my HIS HD4870 with the non stock cooler and it will only go to 809/930 any higher and it artifacts, now i dont get it the HIS is stock pcb with voltera vregs, powercolor has aftermarket with non voltera vregs, why is this happening, does HIS have a bios that dont allow overclocking?? thats ,my only conclusion because it just makes no sense whatsoever :shrug:
overclocking101
09-18-2009, 03:12 PM
well ive narrowed it down to the ram i think anyone have any help to offer?? thanks for your comments guys
Razrback16
09-19-2009, 06:48 AM
809MHz was as high as I could clock my 4870 when I had one card...I can't believe you were able to get yours to 850 without a voltmod. 800-825 is the average for the 4870 on stock volts. When I went to Crossfire I flashed both BIOSes to 800/975 to ensure both would be clocked at speeds they could handle.
jaredpace
09-19-2009, 06:59 AM
Your pcs is just better than average 4870 (from any AIB), that's all. It's possible you could have two identical brand/make/model cards that overclock differently. Luck of the draw, and individual board/chip characteristics...
Having the volterras is nice for soft voltage control, you def want to keep the core & mem & vregs cooled sufficiently, this will help them clock higher. Bioses sometimes make a difference, but i never understood how that works.... (like when everyone wanted an asus TOP bios for their 4870/x2/4890's).
Good luck!
overclocking101
09-19-2009, 02:53 PM
oh ok thanks guys! i cant figure the whole soft volt mod thing out been trying it for a while it says install the voltmod program into the rivatuner directory but idk what that means and when i finally got one to read my card the voltage does not change
zanzabar
09-19-2009, 03:08 PM
it will only change in 3d mode
demowhc
09-21-2009, 12:51 AM
I have a pair of Powercolor 4870's and the highest they clock to 845/900
Most games are fine with the mem overclocked but a couple show artifacts so I leave the mem at default... they have plenty of bandwidth anyway..
22JHP
09-21-2009, 11:21 AM
i have powercolor 4870(512 stock) and highest clock 870/1150 on furmark in july 2008 with liquid metal and diamond xoc bios.900mhz cod5 with voltagefactory.stock voltage with as5 highest clock 850/1090 in may 2009.cooling is effective or maybe it's tired or maybe i've burnt it lol but he's right.
800-825 is the average for the 4870 on stock volts
my cousin's sapphire(not stock) 820mhz