Sapphire HD3870 X2 overclocked@920/999MHz Stock cooler

[spajdr]

Quick question: ATI has an equivalent to "digital vibrance" in the 3870 correct? What is it called?

Thanks!

Avivo Color matey

[spajdr]

MrIcee : GPU-Z dont detect crossfire, SLI, X2 properly under Vista, so dont worry about it.

[MrIcee]

Thanks my friend

Randi

[EXPANDER]

3870x2 nice clock

[pazza316]

Guys when I have two problems any ideas?

Problem one when I try to clock past 960mhz core using CCC it crashes teh PC display goes black and you have to reboot.

Problem two when I use AMD GPU TOOL it says device not detected so I cant use that either.

Any ideas how I can clock this card without these problems?

Thanks

[T_M]

You need the Toollib.dll file for 2900XT clocking in AMDGPUTOOL, you can grab it from nordichardware

[ZoLKoRn]

Problem one when I try to clock past 960mhz core using CCC it crashes teh PC display goes black and you have to reboot.

Yah if you OC card over about ~920 CCC will can't show clock-speed and shouldn't
launch it because maybe clock-speed will go back default or 875MHz max of CCC
can setting

Problem two when I use AMD GPU TOOL it says device not detected so I cant use that either.

Update ToolLib.dll or if already update it but run on Vista, right-click and Run as... Administrator

[trans am]

Nice score. Anyone with Visiontek results? I want to see if the mem clock is any good. I found one for $430 US.

[T_M]

Zolkorn buddy, forget CCC and after boot up just run GPU tool, set the clocks you want, ignore the error message, set the clocks you want on the second device, ignore the error message, close GPU tool

If you really want to check what actual clock gets set, run the temp monitor tab in GPU tool and press start, it will show the real clocks speeds.

[ZoLKoRn]

Thanks buddy i'll try it

[Jon Boy Deluxe]

Zolkorn - nice scores, thanks for sharing your method.

I tried it and I think it works (I got just over 20K 3dm06 with only a light gpu clock/unoptimised settings,click)

T M's method sounds easier...

A question - every time I reboot the gpu returns to stock settings. Isn't there a tool like riva that works with the x2 that will 'apply settings at boot up'?

Cheers

[T_M]

Nope, and i doubt there ever will be. Welcome to Ati overclocking

[spajdr]

ZoLKoRn : on first post you show picture of X2 with mounted fan, can you tell me how big is that one gpu heatsink? thank you.

[ZoLKoRn]

ZoLKoRn : on first post you show picture of X2 with mounted fan, can you tell me how big is that one gpu heatsink? thank you.

It's not one gpu heatsink, it stock heatsink but i put fan on center between gpu1 and gpu2

[Sampsa]

how to make fan spin @ 100% ?

[DFI pit bull]

how to make fan spin @ 100% ?

Riva tuner?

[spajdr]

i can increase Mhz on GPU or MEM but in tests and games not even 1 Mhz is increased, tried 850Mhz, 875Mhz, RAM 950,975, no change?
also AMD GPU Clock dont run under 64vista? i get cannot load kernel driver.

EDIT : nevermind, i forget to disable XP compatibility, my bad. Though underclock works, overclock dont, if i do autotune thru overdrive, at 860 it goes blackscreen, which is a known issue but anyone got any fix for that?
ZoLKoRn : you didnt have problem with 860+ clocks?

[spajdr]

Ok i toyed a little more with AMD GPU Clock Tool and all i needed is to set all in AMD GPU Clock Tool and now it changes on both cores at once.

[Jon Boy Deluxe]

I can't believe there is not a way to apply settings at startup like in riva.

Also, riva doesn't work on any level with the x2...

How are you altering fan speeds?
Is the bios flash available? cba with applying settings manually after every shutdown/reboot!

Thanks

[spajdr]

Good question, i cant seem to find way to alter fan speed, ati tool dont have fan option, so i guess i need to remove part of cooler like zolkorn did and place some fan(s) on it.
Its terrible, second gpu always get 15-20C hotter then first one.

[3oh6]

how to make fan spin @ 100% ?

Also, riva doesn't work on any level with the x2...

http://www.xtremesystems.org/forums/...1&postcount=20



you just have to add

950Fh

to the RV670 line in the CFG.

[T_M]

Yup, correct or you can feed 12V direct to the fan

[Sampsa]

you just have to add

950Fh

to the RV670 line in the CFG.

Great, thanks!

[wedfighter]

or you can simply short the red and blue wire on the fan header it will spin the FAN to 100%

[trans am]

How does everyone like their x2 so far? I was thinking of selling my 8800gt and blowing some dough. should I do it?