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GTX 480 OCP/Throttling

post #1 of 13
Thread Starter 
Hi all,

recently put an AXP II on me GTX 480, wicked cooler let me say.. but im not talking about that, its this thing when im overclock testing...

I ave the OV BIOS so i can go upto 1.213v, however when I clock it at say 900Mhz core with 1.165v it will do a few runs of the Crysis benchmark then just black screen... then flick to desktop... then black screen and stay there forever, (if there is a sound playing on the becnhmark, the sound keep playing no problems/distortions etc) When I look at Afterbuner.. it has automatically brought my overclock from 900mhz to the default EVGA overclock (stock clocks) of 726mhz core

Is this OCP.. OVP?

FYI when i put the voltage at 1.188v its fine no black screen?

My 480 idles at 0.963v... however I dont know the VID... and it is an EVGA SC card so the deafault voltage reported in Afterburber is 1.075v.... but surely that can't be the VID as it's quite high nearly 1.1v for VID... noi dont think so.. thats just the voltage EVGA set to keep the stable overclock for selling purposes..

My temps are absolutely fine... never see over 65-70c MAX load..

I use to try to get 900mhz with the stock cooler lmao how little did I know.. anywya yeah.. i could barley get the thing stable at 860 core with the stock cooler no matter HOW much voltage i put into it.. and i'm not one for ****tin my pants on the voltage, I just bang it straight up to the max... use to get temps 95-100c...

So I know I have a load of headroom for temps..


Anyway, anyone care to comment on the OCP/OVP thing (which is the main point of this post remember please)... im just not sure whether its kickin in when the screen goes black during stress testing... its just I never get BSOD or anything else problem wise when the GPU fails.. just the same old black screen... flick to desktop... then black screen forever...

I was reading the OCP/OVP BIOS mod thread on here so thats what sparked my thoughts on the matter... I will apply that BIOS mod if anyone can tell me categorically that the OCP/OVP IS kickin in, in my partcular situation.


Thanks all!!
post #2 of 13
Your 900MHz overclock is just unstable? When you add more voltage, it doesn't happen = your overclock just got more stable. I'm pretty sure it's just that.

That flicker and reset of OC settings, is a normal sign of unstable overclock. And as you add more voltage it gets fine. 900MHz is pretty high, so there's no wonder you need more voltage. I can barely get 850 MHz at 1.188V.
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post #3 of 13
Thread Starter 
hmmm... i thought that was the case anyway, but just didnt want to hear it lol

um, even when i crank the voltage to 1.213v with say 915Mhz its unstable... so maybe 910 is all my GTX 480 can do?...
post #4 of 13
Thread Starter 
i'll have to check the afterburner voltage monitoring when the black screen crash happens to see if the voltage is cut to confirm it's not OCP/OVP
Edited by FuRy88 - 2/24/12 at 4:41am
post #5 of 13
Why should it be that, when it gets fine with MORE voltage. If it thinks you give them too much voltage, why would more make it better?

Your overclock is unstable, and 900 is a very good OC no matter what. 910 as well. Now you just need to do some longer stress tests to make sure it's really stable. And yeah, prolly just hit the wall at 910MHz.
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post #6 of 13
I think you've hit the max OC possible on air cooling. There could be a problem of the VRM and memory not getting enough cooling. On stock cooling i could get about 830MHz on 1.138v, but on water i can get just above 900MHz stable and 920MHz benchable, this is still at 1.138v. Over 920MHz the card/driver always crashes instantly.
post #7 of 13
gotta do the pencil mod to get rid of OCP. I did it to my stock gtx470 and has been working great since.
I just used a #2 pencil on the ocp resistor.

http://www.overclock.net/t/772999/first-volt-mod-gtx-470-overvolting-success-updated-with-vantage-run
should be the same for a gtx480
Edited by DzillaXx - 2/24/12 at 5:31am
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post #8 of 13
Keep your mem @ stock and up the core only, be careful though! This cooler is amazing for the core, but very bad for the VRM. Its good that ur getting black screen and everything goes to stock. If somehow things gets messed up, you might loose your card.
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post #9 of 13
Hmm myLightning only stable with def clock 1.043v (idle : 0.973v) at 850/1000, temp 64 - 70c. Tried 880mhz stable enough with +62mv in AB or 1.106v temp 69-73c, yup MobeeJ is right about memory, my card doesnt like higher memory overclocked, stable only with 1050mhz with +10 - 10mv.
900mhz is hard to pass, I guess temp of VRM holds me, unfortunately mycard doesnt has VRM sensor just like 560Ti Hawk TF3 did.
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post #10 of 13
Thread Starter 
yeah i already know about the tempermental memory on the GTX 480's and in light of it I dont clock the memory... I just leave it at stock
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