View Full Version : 6800 Ultra overclock??

09-13-04, 09:27 AM
Hi there,

Here's my rig: P4 2.8 GHz Northwood HT enabled, 800 MHz FSB, coooled by a Zalman A-CU 7000 CNPS cooler, Asus P4P800 motherboard, Leadtek Winfast A400 Ultra TDH (400/1100), 1 Gb of Corsair TwinX3200C2PT XMS memory, Asus CD-RW 48X, Maxtor HDD 80 Gb, 7.200 rpm, Audigy 2, Thermaltake Xaser III Lanfire VM2000A, with 4 fans Hardcano-controlled, Thermaltake Silent Pure Power 560 W PSU, Samsung 757NF monitor; Windows XP Pro SP1, DX 9b, ForceWare 61.76.

I can’t seem to overclock the video card more than 434 MHz core and 1.16 GHz memory. Running rthdribl with the core clock set over 434 MHz results in artifacts showing up on the screen (corrupted graphics) followed by system freezing after some time (5 to 10 minutes of rthdribl), and that’s without overclocking the memory. Strangely enough, the core temperature doesn’t get much higher when o/c - just one or two degrees more: 82-83 Celsius at standard speeds vs. 84-85 C at 434/1100 MHz. Looks like the temp isn’t the limiting factor here. Is this the maximum speed for this particular card? I know that overclocking performance may vary from card to card but most people with Ultra cards seem to hit 440 or even higher with ease. At 450/1100 MHz, the core/mem doesn’t pass the internal test.

Now, about Aquamark3 score: In default settings, I get from 54,800 to 55,300 aquamarks. No vsync on, drivers set to application preference etc. Overclocked results: around 57,000 if I remember well.

Is this a normal score for my video card? I also noticed that in the final A3 score, the video card usually surpasses the CPU score, something like this: 8,246 for the GXF and 8,023 for the CPU. Is my CPU such a bottleneck at 2.8 GHz? Now come on, I’ve seen some huge Aquamark score in the 66,000 to 70,000 marks, yet these score were obtained with much faster cpus like A64 or P4 over 3.0 GHz.

09-13-04, 11:11 AM
Hmmm, it could be just your card that's causing the lockups. Not all overclock as well as we'd like. And yes a faster cpu would help but I wouldn't think it would make much of a difference.

09-13-04, 11:52 PM
It sounds like that your card is at it limit when it comes to overclocking.Plus it is just clocked at the refrence design 400/1100 and nearly ever other company is clocking at 425 on the core.but you Am3 score sounds about right with your setup.If you are wanting to overclock it best to check out all the reviews and the fourms to see what brands seem to over clock the best.My Evga 6800ultra will run at 475/1250 with no problems except it runs a little hotter but it still come down to the luck of the draw.unless you find a company selling one overclock and they will warrant it.

09-14-04, 12:17 AM
475mhz! wow

09-14-04, 12:18 AM
I get 450 MHz core and 1.2ghz mem

09-14-04, 01:53 AM
I think it might just be your card. Not all cards overclock well. I too have a P4 2.8 Northwood with a gig of pc2700 RAM (check sig) but my PNY Ultra can overclock to 450/1200 without problems. I had to drop it down to 425/1200 though because my card was getting too hot. Although you may not be able to overclock your card as much as others, you still have a great card so I wouldn't feel bad.

09-14-04, 03:32 AM
Up to 434 MHz it's perfectly stable... Over this frequency, graphics corruption and lockups will appear. I can't just send it back because of this and ask for another one, so I guess I can live with that. 450 MHz sounds great, not to mention 475! But as stated, it's all about luck - you either get a good overclocker or you don't.

09-14-04, 02:23 PM
In my aquamark with my BFG GeForce 6800 GT at stock speeds, I got a score of 60,000(rounded down a tiny bit). I'm thinking you should be getting a higher score, especially with that overclock. It might be your CPU limiting you a lot though.. among many other factors that I'm not sure about. My current CPU is a AMD 64 3000+. I'm no guru at this kind of stuff, so if im sounding like a complete idiot, please tell me :drooling:

09-14-04, 02:38 PM
Just to elaborate on Antares overclock, if he runs his card at 434 core, which is it's overclock limit without artifacts. Is he in danger of burning his card out being so close to it's limit?

As my BFG will goto 435 stable also, but when I set my card at 441, I get lockups and artifacting.

I've been using ATI cards for awhile and I'm a bit rusty as it were.

09-14-04, 03:58 PM
I got a PNY Ultra here.

I can o/c to 450/1.15 stable. Can't seem to get my memory above 1.15 like others around here. Its really is just luck. (My PNY was actually o/c'd from factory to 425/1.1)

I had an XFX GT before this that o/c fine above 400/1.1 which is greta for a GT. After a week it died (not b/c of the o/cing) which I RMA'd and got an EVGA GT instead. That GT would only o/c to like 370 and the mem wouldn't o/c at all. Pretty unusual for a GT. I just wasn't happy, so I returned it and finally got an Ultra, and I'm super happy with this card. Just be happy you can o/c at all. My mistake was buying the GTs expecting it to o/c to ultra speeds, if I wanted Ultra speeds I should have just gotten an ultra to begin with.

I'm thrilled with my card, even if it doesn't o/c insanely like others.


09-14-04, 04:15 PM
Well, my BFG 6800U is perfectly stable at stock 425/1100, but locks up in 3DMark03 with even 1Mhz over that on the core. (whine)

09-14-04, 05:07 PM
gettin 494 1250 watercooled.
With pencil volt mod..no problems.

09-14-04, 05:36 PM
I forgot to mention that my memory will overclock all the way upto 1.25.

But I can still only get 435 stable, even with my memory set to 1.1 btw.

Can anyone answer my question in my previous post?