Poor 6800GT OC

[Deus Excalibur]

I got a Koolance EXOS-AL watercooling system around a month ago along with a Koolance NV2 waterblock to see how far I could take my 6800GT. Apparently I can't take this thing far at all.

My max OC is 415mhz core, unknown max memory OC but stable at 1120mhz. Loads temps are 53C.

I tried using a 6800 Ultra BIOS but I can't even reach 420mhz. After around 2 hours of 3dMark 2k3 the screen becomes garbled with a bunch of colors.

Any tips to OC this card more?

[ozzimark]

i don't think xfx oc's too well. check my sig :( (i have an xfx too)
the sad thing, i used to be able to get to just under 400mhz until i tried 1.4v, now i can't do anything over 380 without crashing eventually.

[mr_knowitall15]

i don't think xfx oc's too well. check my sig :( (i have an xfx too)
the sad thing, i used to be able to get to just under 400mhz until i tried 1.4v, now i can't do anything over 380 without crashing eventually. i agree, lookie my sig too, i havent tryed flashing to ultra BIOS yet though, i bet the extra .1V MIGHT get me up to 450ish, if im lucky and got a good GPU..

[Cranox]

The ram of my XFX go's up to 1280 mhz artifactfree :) , Core is limeted at 434 mhz

[Deus Excalibur]

I'm going to move over to PCI Express to get a DFI Lan Party SLI seeing as I have had poor OCing results with TWO of my MSI Neo2s with G.SKill TCCD and Ballistix memory and two CPUs to play with.

I'm thinking of going with a BFG 6800GT OC. Would it be worth it to shell out more for an Ultra and OC the crap out of it? I'll be using water cooling BTW. And I will probably not get another card for the SLI mobo for a few months.

[andL64]

ultra bios is worse than the default GT (which is best for ocing)

also only change voltages not bios of an other manufactor

[redgoo]

Do you have good airflow over the card and ram? Do you have ramsinks?

I couldn't run my 6800 gt (not XFX though) with water much over 400 without issues. The card and ramsinks were getting really hot (ambient temps were exceeding core temps). However, once I got good airflow over it, I could go up to 440/1200 at 1.4v. I still think I can push it a little further (450-455) as well.

[andL64]

i get 460/1230 with ram heatsinks +fan and fastwrites off (gives a lower score)

and with fast writes on and heatsinks+fan i get 440-450/1200-1230 (diffrent what i bench)

still got 1,4 default 2D and 1,5V 3D but only gain stability....


seEn

hth

[Deus Excalibur]

I use watercooling so airflow is not an issue, the Koolance NV2 also watercools the RAM and my temps are 53C load @ 1.4v.

[redgoo]

I have watercooling as well (only for the GPU though), but airflow was still a pretty big issue as the card was getting very hot where the molex connector is. That is why I mentioned it.

[Deus Excalibur]

I don't know if the airflow was enough, but I had 1 80mm side pannel fan on my case.

I'm moving over to a PCI express system and a BFG 6800 Ultra OC, what seems to be the average OC of those cards?

[Jo_The_Psycho]

My eVGA 6800GT OC's to 447/1.15 with a NV5 :rolleyes: Few artifacts...though.