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View Full Version : NF3 + 6800GT - How far can you oc?


joshua7
07-09-05, 12:30 PM
Hi guys!

Question is simple: if you have an nf3 based mobo and a 6800GT how far can you oc your card?
Because I can do only 370/1150... (3dmark05 gives lower scores on 400/1100 than on default. I know it is throtlling as the core goes back to 350mhz, but do not know why that is) :thumbdwn: I have tried various bios versions and lots of other things, but nothing was of any use. I guess it is a problem with the nf3 chipset or I need a new psu. :)
Also, please, write down the type of psu you have!
Thanks!

mod: whether fastwrites is on or off makes no difference

joshua7
07-10-05, 05:41 AM
Come on guys! Somebody?
I forgot to mention that the problem is only D3D related. In OpenGL, like Doom3 I, do 405/1100 easily. :)

rewt
07-10-05, 05:49 AM
6800 GT only have 1.3 volts on the core. That probably explains why you can't run 400+ MHz stable. You could always mod the BIOS to 1.4v. I did it with a couple regular 6800NU's and they had no problems running 400+ MHz.

joshua7
07-10-05, 06:00 AM
6800 GT only have 1.3 volts on the core. That probably explains why you can't run 400+ MHz stable. You could always mod the BIOS to 1.4v. I did it with a couple regular 6800NU's and they had no problems running 400+ MHz.

Could be, but why just in D3D? Using 1.4v, I also reach 417mhz, but I don't want to use that with a GT. Though I have a VF700-cu, as well.
With nf2 and intel based systems there is no such problem at all.

StoNer
07-10-05, 09:18 AM
How high can you get your core to O/C with the memory at default?

I dont have a nf3 but if u havent already u should try seeing what u can get each to O/C to by themselves and see what happens :)

joshua7
07-10-05, 10:09 AM
How high can you get your core to O/C with the memory at default?

I dont have a nf3 but if u havent already u should try seeing what u can get each to O/C to by themselves and see what happens :)

Post number 1. :)

No, not just the core, but the 2 at the same time.

joshua7
07-15-05, 01:48 PM
Installed a new psu (FSP bluestorm 500). That was not the problem as I stayed at 370mhz. :thumbdwn:

myshkinbob
07-15-05, 06:26 PM
On my old socket A board i could oc past 400mhz, but with my nf3 board, up to 385mhz, although with the 77.xx drivers, only 375mhz. The 80.40 drivers let me go back up 385 with stability.

Upping the vcore to 1.4v allows me to go past 400mhz on the nf3 board, however, the 6800GT's voltage regulation components are not designed to deliver 1.4v to the core, and after a few months it became unstable, artifacts etc. So i wouldn't advise altering the 6800GT's vcore.

The practical difference between 375mhz and 400mhz is about 3-5% fps at most, you'd be pushed to tell them apart without benchmark figures, so not really worth permanently damaging a $400 graphics card over.

about the nf3 + 6800 lower OC problem, personally i suspect it's to do with AGP signal timings being poor on the nf3, whether it's driving strength or something even more low level, it's just a sort of bug in the nf3 chipset.

CaptNKILL
07-15-05, 06:45 PM
When it isnt so hot out, I can run 415\1170 easily... itl run higher than that, but i decided to back down. Right now its set lower because its around 90 every day this time of the year.

muaddib
07-15-05, 07:15 PM
Well.. I'm runnin' PNY6800GT + Neo2 @ 400/1100 and i'm still not sure if it's 100% (hard-lockups in BF2, other than that - all games stable)... Some times it's rock solid at 420 and sometimes unstable at 400... it disturbs me! I think I should mod and update my bios.

BTW - What is this "throttling"?

j0j081
07-16-05, 05:05 AM
Hi guys!

Question is simple: if you have an nf3 based mobo and a 6800GT how far can you oc your card?
Because I can do only 370/1150... (3dmark05 gives lower scores on 400/1100 than on default. I know it is throtlling as the core goes back to 350mhz, but do not know why that is) :thumbdwn: I have tried various bios versions and lots of other things, but nothing was of any use. I guess it is a problem with the nf3 chipset or I need a new psu. :)
Also, please, write down the type of psu you have!
Thanks!

mod: whether fastwrites is on or off makes no difference
How big of a boost are you getting from the memory Ocd?

joshua7
07-16-05, 05:05 AM
On my old socket A board i could oc past 400mhz, but with my nf3 board, up to 385mhz, although with the 77.xx drivers, only 375mhz. The 80.40 drivers let me go back up 385 with stability.

Upping the vcore to 1.4v allows me to go past 400mhz on the nf3 board, however, the 6800GT's voltage regulation components are not designed to deliver 1.4v to the core, and after a few months it became unstable, artifacts etc. So i wouldn't advise altering the 6800GT's vcore.

The practical difference between 375mhz and 400mhz is about 3-5% fps at most, you'd be pushed to tell them apart without benchmark figures, so not really worth permanently damaging a $400 graphics card over.

about the nf3 + 6800 lower OC problem, personally i suspect it's to do with AGP signal timings being poor on the nf3, whether it's driving strength or something even more low level, it's just a sort of bug in the nf3 chipset.

So you have it too.
But it is only D3D related in my case. The Doom3 timedemo just runs fine at 405/1100. :) I'm sure it is a bug. Maybe something with the GART driver, don't know. :(

joshua7
07-16-05, 05:08 AM
When it isnt so hot out, I can run 415\1170 easily... itl run higher than that, but i decided to back down. Right now its set lower because its around 90 every day this time of the year.

You don't have the problem with nf3. Good for you. :)
I saw that it is not universal, looking at the signatures reveals that, still it is problem which does exist.

joshua7
07-16-05, 05:10 AM
How big of a boost are you getting from the memory Ocd?

Don't know exactly, but I know it is relatively nothing compared to higher gpu clocks. I'd give up this +150mhz easily for the +50mhz on the gpu. :)

joshua7
07-16-05, 10:59 AM
New developments:

installed GART driver 4.40 and a new Leadtek 6800gt bios and started to play with drivers.

Max. stable oc in 3dmark05:

66.93: 390/1190
77.50: 385/1175
77.72: 370/1150

Declining numbers... :confused: Who understands this?

SquireSCA
07-17-05, 08:32 AM
I have a PNY Verto 6800GT and while I am not on an NF3 board, I can benchmark at 425Mhz core, 1.15Ghz memory...

joshua7
07-17-05, 12:20 PM
Have an idea, that the more time passes since turning on the sys the less you can oc your card.