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Limit Factors of 8800GTS Overclock

post #1 of 16
Thread Starter 
Alright, I am just trying to have an intellectual discourse here now so I would entertain any postulations or theories on this matter since I would like to really identify the problem and sort it out.

With my current system as per the specs below, I have tried overclocking my 8800GTS 640MB card both in terms of Core and Mem MHz's using all of the following drivers also independently checking each for stability and 3DMark06 score.
1.WHQL 169.21 Driver
2.Omega 169.25 Driver
3.WHQL 174.74 Beta Driver.

Overclocks were done with ATITOOL while temperature monitors were done with Everest and Rivatuner.

Default clock idle temps for the card is 41°C while load temps is 43°C.
Overclocked to 660/940 idle temp is 45°C while under load is 51°C max.

CPU overclock is stable at 3.6GHz for 23hrs with Prime 95 Version 25.3 (runs all 4 cores) with Blend (large FFT) stress test.

My problem is this, I cannot overclock above 660 core and 940 memory though the temperatures are very low. What could be the reason for this?

System could not be crashing due to temperatures nor due to CPU stability. What is the reason? Can someone postulate? I am looking for answer beyond someone saying thats the limit of the card. If it is the limit then what is the cause of the limit? Thats what I want to know. Is it the architecture of the card, the BIOS or something else? The current bios on the card is 60.80.0A.00.02 which according to info at mvktech is original Nvidia overclocked Bios.
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post #2 of 16
if the card is crashing when you up the speed but the temperature isnt an issue as you say. then to achieve stability at a higher speed you will have to vmod it but this is risky and will void your warranty, also temperatures will rise dramatically if you do this but it could aid you in terms of stability
    
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post #3 of 16
Thread Starter 
vmod u say. to be honest about the only vmod that i am willing to do right now is the bios vmod which i am not sure is going to help

.

still recovering from the shock of killing another GTS640 card and BadAxe2 alltogether recently. but you think this could be the solution?
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OS - Raptor 74GB, 2xSeagate 80GB SATA DVD Drive, CDRW XP Professional SP 2 24" Dell WFP LCD Screen 
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post #4 of 16
Volt moding is you're best option. My 8800GTS 320MB is limited to 593 core 1008 mem and 1512 shader.

I have tryed to volt mod my memory but it didn't get me any higher. And I don't have the parts and tools needed for a Core volt mod.

EDIT: Where have to heard of a BIOS volt mod? I have a PCI video card backup and I would be willing to give it a try.
    
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post #5 of 16
well if its crashing and your drivers and cooling is ok and performing as you say. i would have thought if it was drivers though, that it would crash at stock clocks aswell. if it doesnt crash at stock clocks then my guess is vmod it because you have killer load temperatures. what do you use to test the cards stability can i ask?
    
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Core 2 Quad Q6600 @3.2Ghz Asus P5N-T Deluxe 2x BFG 8800GTS 640 SLi 4GB Crucial Ballistix Tracer Pc8500 
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post #6 of 16
Thread Starter 
Quote:
Originally Posted by allanmonaghan View Post
well if its crashing and your drivers and cooling is ok and performing as you say. i would have thought if it was drivers though, that it would crash at stock clocks aswell. if it doesnt crash at stock clocks then my guess is vmod it because you have killer load temperatures. what do you use to test the cards stability can i ask?
it hasnt crashed at stock ever. also the crash is usually when i try to oc above the range i mentioned earlier. as for the drivers, just to eliminate the possibilities, i always uninstall drivers and run both DC and Sweeper in safe mode before reinstalling new drivers.

i run ATITOOL for artifact check for a minimum of 100minutes. if its stable then i run 3DMark06 for benching. so far with the 174.74 Beta drivers i have breached about 14200+. Not happy with it though. Also i make sure to load the oc via rivatuner 2.06 on windows boot.
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OS - Raptor 74GB, 2xSeagate 80GB SATA DVD Drive, CDRW XP Professional SP 2 24" Dell WFP LCD Screen 
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post #7 of 16
wel that's a nice oc for a GTS G80. when you push it too far your gpu will just be instable, just like a cpu with too little vcore. Problem is that you can't just pump up your vmem with the 8800. The only way would be a voltmod but that's too scary for me
    
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post #8 of 16
well if you want to clock higher and be stable then i think a vmod is your only option. im not sure how to do it but im sure there are guides on ocn under the frequently asked questions sections
    
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Core 2 Quad Q6600 @3.2Ghz Asus P5N-T Deluxe 2x BFG 8800GTS 640 SLi 4GB Crucial Ballistix Tracer Pc8500 
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post #9 of 16
Thread Starter 
Quote:
Originally Posted by allanmonaghan View Post
well if you want to clock higher and be stable then i think a vmod is your only option. im not sure how to do it but im sure there are guides on ocn under the frequently asked questions sections
actually i do prefer not to do a physical volt mod though i have read the guides both here and at xs. but thanks anyway.

Quote:
Originally Posted by celebro View Post
wel that's a nice oc for a GTS G80. when you push it too far your gpu will just be instable, just like a cpu with too little vcore. Problem is that you can't just pump up your vmem with the 8800. The only way would be a voltmod but that's too scary for me
thanks man. believe me volt mod is also scary for me.

Quote:
Originally Posted by jonny1989 View Post
Volt moding is you're best option. My 8800GTS 320MB is limited to 593 core 1008 mem and 1512 shader.

I have tryed to volt mod my memory but it didn't get me any higher. And I don't have the parts and tools needed for a Core volt mod.

EDIT: Where have to heard of a BIOS volt mod? I have a PCI video card backup and I would be willing to give it a try.
actually the bios volt mod is pretty limited i think but it can be done using nibitor. u have to however be very careful with it otherwise the card is toast.
here are the options in the nibitor.

also find some screenies of the system.



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2012 Rig
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Q6600 2.40Ghz @ 3.6GHz VID 1.2375 Lapped Asus Maximus Formula SE MSI Geforce 8800GTS Crucial Ballistix Tracer 2x1GB PC8500 
Hard DriveOptical DriveOSMonitor
OS - Raptor 74GB, 2xSeagate 80GB SATA DVD Drive, CDRW XP Professional SP 2 24" Dell WFP LCD Screen 
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post #10 of 16
Tried adjusting shader and core clock separately? If you can't get it any higher by adjusting separate settings, then a volt mod is your only option. Not all cards are created equally. One guy may get 750 MHz core and another 680 MHz core. It all depends on the card and it's environment, and what batch it was created in. Some are better than others.

But I'd just be happy with where you're at with a G80. If you have no confidence in yourself doing a vmod, then just don't do it. You'll more than likely screw it up. You know yourself better than anyone here.

This is one reason why I buy a card at a store and then mod it right away. Buy it, read up on it, and then get it to its max as quick as possible. Then if you **** it up just take it back to the store and get another one (the customer service people are incompetent and don't get paid enough to care why you're bringing it back...you'll get another one). On this 8600GT I've done it 3 times already until I got a setup I like. Now it's 100% stable, and guess what? No more ****ing around with it because it's already maxed out, and I can concentrate on other things.
     
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