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6800nu Overclocking questions

A

aka1nas

Diamond Member
I have a 6800nu(Leadtek AGP) that came from newegg(Supposedly new, boxed seemed factory sealed still) with everything unlocked(installed rivatuner and went to unlock pipes and shaders and everything was already unlocked for me) and passes the rivatuner internal test when OC'ing up to around 360ish Mhz Core. However, even a 1 Mhz OC on the core causes bad stuttering. The usual suspects like turning off fastwrites and adjusting PCI latency or using a diff NF3 Gart driver don't seem to help (though they helped with stuttering at stock speed with a few games). Any ideas on what could cause this?

P.S. Should this card throttle down to a lower 2d clock speed when not playing 3d games? I am not forcing a performance level in rivatuner, but the card doesn't throttle below it's 3d speed.

Full System specs:
A64 3000+@2.5Ghz
Antec 550watt Truepower PSU
Leadtek 6800nu
MSI K8N Neo 2 Platinum
2GB RAM
 
So rivatuner recognizes it as 16pipes and 6 vertex shaders??? What is you core/mem speed now???

I can run 392core and 900mem...backed off to 385/850 for contiuous use....

May want to try to pump the vagp up a notch....When I was OCing the core when it will freeze I bumped the vagp up to 1.55v and got 7 more mhz out of the deal stable....According to my board (Neo2) that undervolts everything 1.5v may not have been delivering that....I think 1.6-1.65v is safe...I have a BFG so the cooling (dual fans) is a bit on the higher end....
 
Yes, rivatuner recognizes it as a 16 pipe, 6 pixel shader card running at 325 core and 350Mhz(700Mhz DDR) RAM.

I will give the vAGP bump a try. My card is a leadtek winfast a400 6800 with a pretty beefy copper sink(see photo), so it should have sufficient cooling.

http://www.leadtek.com/3d_graphic/winfast_a400_2.html

Do you know if the card is supposed to have a seperate 2d clock speed?
 
The Neo2 undervolts, you say? Hmmm.... maybe I'll adjust it and try shooting for 400 with my 6800nu. Is it possible to read the gpu core voltage anywhere?
 
The GPU core voltage is set by your video card's BIOS. Rivatuner can sort of read it in an abstract fashion(It measures voltage levels which correlate to a voltage table in your card's BIOS). This is only really useful for ensuring that your GPU's voltage isn't changing unexpectedly.
 
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