3870 @ 1200MHz Core w just Dry Ice

**JamesBong420** · 02-12-2008, 03:08 PM

Originally Posted by Riska

I have a question about the ocp mod u say u have to take 2x300k ohm but i cant get hold on any 300k ohm smd resistors only 330k ohm is that ok?

sorry for the thread revival.

BUT i was wondering the same thing. all i can find are 330k ohm. and i do not want to run a few 100k in parallel if i dont have to. so are the 330k ers going to do me well?

**Riska** · 02-12-2008, 03:23 PM

It works fine with 330kohm i have done it with that

**JamesBong420** · 02-12-2008, 03:44 PM

Originally Posted by Riska

It works fine with 330kohm i have done it with that

thank you very much! respect!!! and now for more then 1026mhz core on my 3850... YAHOOOOO

**china_d975xbx** · 02-12-2008, 10:25 PM

very nice!

**Norway** · 02-13-2008, 02:27 PM

do you know if it is 1026Mhz on 3870 too ?

**JamesBong420** · 02-13-2008, 02:52 PM

Originally Posted by Norway

do you know if it is 1026Mhz on 3870 too ?

do you mean as a mhz wall?

also on a side note. i have done the ocp mod on my 3850 works great. but now i cant even get a 1026mhz run. cause my mosfets are getting ragging hot even with copper sinks super glued to them AND a 120mm fan. i cant even touch the sink for more then a second when im benching. there are contact points for some more caps that the 3870s have and the 3850s don't. so i might just have to add the caps on the contacts tonight and see.. but any info on helping those mosfets i would LOVE YOU!

**M.Beier** · 02-20-2008, 05:23 PM

Originally Posted by anubis

doesnt that void your warranty?

I think wont cover if sender is "Peter Tan"

**ownage** · 02-20-2008, 05:40 PM

Just ridicules these cards can only do 1200mhz with so many mods. I've seen 2900xt's dry ice cooled @ 1200mhz core. I expected more from these cards, especially because there 55nm instead of 80nm.

**STEvil** · 02-20-2008, 06:42 PM

double strapping the mosfets might get some more (basically take identical mosfets and attach them in parallel).

**Felipe** · 02-23-2008, 07:18 PM

lol 16k!!

**ceemic** · 03-02-2008, 05:38 PM

1200MHz@DICE

Look at mine 3870@aircooling

1147MHz@1,76V
http://ceemic.pri.ee/45nm/81153.jpg
http://service.futuremark.com/compare?2k1=9343847

Volcano12 + "window_open_mod" + -1C outside temp

Card+Vmod: http://ceemic.pri.ee/hardware/hd3870/

So, no ocp needed, when going over 1100MHz?

**Winterwind** · 03-03-2008, 06:29 AM

Originally Posted by ceemic

Volcano12 + "window_open_mod" + -1C outside temp

crap, your GDDR3 card scores and oc-s like hell.

Copy-paste from another forum:
Intel C2D E8400@4722MHz
2x1GB@524MHz
HD3870@1134/1134 Vgpu=1,79V Aircooled
PCIe=150MHz
53080p
http://service.futuremark.com/compare?2k3=5755095

And 3D Mark 2006: http://ceemic.pri.ee/45nm/15384.jpg

Open window mod: http://ceemic.pri.ee/hardware/bench/

Respect

**Kasparz** · 03-03-2008, 06:41 AM

That Volcano 12 reminds me of PlatoonSgtElias 7800GTX

**Winterwind** · 03-03-2008, 06:48 AM

Those were Ceemic´s runs..
My HD3870 GDDR3 is at Jaan´s place for vmods

**ceemic** · 03-03-2008, 06:49 AM

Kasparz, tnx "neighbour". Estonia rules on aircooling

**sponge bob** · 03-03-2008, 10:08 AM

Very nice results ceemic

, but i will be back in game soon

**ceemic** · 03-05-2008, 06:43 AM

-4C ambient power: http://ceemic.pri.ee/45nm/81408.jpg HD3870@1174/1161 Vgpu=1,84V

http://ceemic.pri.ee/45nm/28327.jpg
http://ceemic.pri.ee/45nm/53640.jpg

**Riska** · 07-10-2008, 06:27 AM

My Sapphire HD3870 is also fully modded and with highend water and 2.03v on gpu it brooke 2 records..

http://www.hwbot.org/result.do?resultId=731706

http://www.hwbot.org/result.do?resultId=731802

Look at the Core and mem speed 1250+mhz core and 1460+mhz mem