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*** NVIDIA 8800GT OVERCLOCK ***

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Got my Zalman VF 1000 installed, idle temps are 35-36C load temps are 48-49C. Overclocked to 750/1875/1050

Artifact free on ATI Tool for 10+ minutes.

And artifact free in Crysis. I think I have more headroom but I want the thermal paste to settle in.
 
I have a BFG 8800GT OC and kinda thinkin' I'm dumb or lucky. I've overclocked pretty much every card I've had, but this seems to have a lot more headroom than I'm used to.

Core2Duo (E6300) @ 3.0Ghz
Stock is 625/1566/900

Running unigine and atitool and no errors or artifacts/goofy stuff at 780/1904/1025

Unless the settings just aren't taking hold and it's still running stock. Adjusting using RivaTuner and applying after each change.
 
Originally posted by: DeathBUA
Well I dont know if I trust JohnnyGuru. My memory can handle 1050, or 2100mhz. And thats running ATITool and Crysis to stress the crap out of it. I've been running my memory at 1025 since I got the card
Click to expand...

I techically "recanted" and neglected to continue to participate in this discussion up until today BECAUSE someone brought up the EVGA and BECAUSE I work for BFG I did not want people to think I was just spreading FUD on behalf of BFG. I knew once someone mentioned stock OC's at and over 2GHz that my comments would be perceived as such. I don't work for BFG in THAT capacity and I only come to these forums for my own entertainment and not on behalf of or representing any company.

But now we've seen quite a few problems with cards with highly clocked memory so it now seems I'm not so much the naysayer anymore. *whew*

There have been issues with memory clocks at and greater than 2GHz after prolonged use (that's the key, of course.) And we have found that once these problems start cropping up, if they're caught right away, bringing the clock down to 1900 or less solves problems. The problem is not with the memory, cooling, etc. it is with the interface and the problems do not show up right away so keep running ATI tool and Crysis if you'd like. If problems occur and you don't bring the clocks down, you damage the card. But then again, that's what lifetime warranties are for, right?
 
Originally posted by: jonnyGURU
Originally posted by: DeathBUA
And we have found that once these problems start cropping up, if they're caught right away, bringing the clock down to 1900 or less solves problems. The problem is not with the memory, cooling, etc. it is with the interface and the problems do not show up right away
Click to expand...

What kind of problems was showing up? How can we tell if its from the interface?
Click to expand...
 
You'll start getting artifacts, lock ups, etc. Typical stuff. It'll just start and continue getting worse. Once you bring the clock back down, it all goes away.

It's funny, I'm hearing a lot about it because people are thinking it's a PSU problem. 😀

I'm hearing of some people volt modding their cards and getting their OC's back, but there's two problems with this: 1. Can this further damage the card down the road and 2. This clearly voids your card's warranty.
 
Frankly if these issues are as serious as they seem to be and being as OCing the memory from ~1900 to ~2000's relatively small performance gain it doesn't seem worth it.
 
Originally posted by: JBT
Frankly if these issues are as serious as they seem to be and being as OCing the memory from ~1900 to ~2000's relatively small performance gain it doesn't seem worth it.
Click to expand...

I don't remember the site, but I recently looked at some 8800gt OC article, and I got the impression that while the memory OC alone doesn't give much benefit, the memory clocks make a bigger difference if you also OC the gpu.
 
Originally posted by: munky
Originally posted by: JBT
Frankly if these issues are as serious as they seem to be and being as OCing the memory from ~1900 to ~2000's relatively small performance gain it doesn't seem worth it.
Click to expand...

I don't remember the site, but I recently looked at some 8800gt OC article, and I got the impression that while the memory OC alone doesn't give much benefit, the memory clocks make a bigger difference if you also OC the gpu.
Click to expand...

I was pretty convinced that the GT wasn't memory bandwidth limited but ArchAngel777 was able to produce some results that indicate it is (high levels of AA), like you said, when the core is pushed to the max. Memory bandwidth did very little in my testing and the games I run, but that's probably because I don't run with AA or run very low AA for most games @1920. So yeah it does seem NV saved some by going with cheaper memory (even most G80 GTS/GTX memory clock higher) which ultimately cripples the G92 GT and GTS given their high potential core/shader clocks.
 
OC as per sig.

The memory can do 2000Mhz stable, but I am running below that on account of jonnyGURU's warnings.

I have not tried to clock the core and shaders higher than they currently are. My CPU is probably a small bottleneck for the 8800GT even at stock speeds, so really pushing its pants off with an OC isn't really necessary or beneficial, at this point anyway.

These speeds have been checked on three separate occasions with 1hr of ATi Tool artifact scan at most sensitive settings. Load temps 63C.

Card is a BFG 8800GT OC black PCB, purchased off the shelf from Best Buy during their $237 deal about a month back.
 
My gigabyte 8800 GT only does 690 /1750/ 975, with an arctic cooling S1 on a full load temperature of 48 C. I thought the cooler it is, the higher it goes, but.... the core is at the same level when I was using the stock cooler. God, only if the pencil volt mod was working....
 
650/1900/950... Not very ambitious, I know, but I jerry-rigged my intel stock heatsink fan to my crippled S1 using zipties (missing ramsinks, anyone) and I get 38C idle and 58C load at absolute max (say, hours of ATitool stress) I don't want to push further, before I put the fan on, it artifacted at stock.

Oh, and I got the last 8800GT OC from the Best Buy in my area.
 
740 1780 1912.

blueacolyte how did you get your shader clock to 1900! thats sweet.

i have the bfg oc from bestbuy. some volt mod guys have their core/shader at 910/2200. I'll bet those cards are lightning fast.
 
Originally posted by: error8
My gigabyte 8800 GT only does 690 /1750/ 975, with an arctic cooling S1 on a full load temperature of 48 C. I thought the cooler it is, the higher it goes, but.... the core is at the same level when I was using the stock cooler. God, only if the pencil volt mod was working....
Click to expand...


Cooling is just one part of the picture.

The idea is to get frequencies up...the more voltage you pump through a chip, the higher you can take the frequencies....but the more heat you produce, and if this heat is not dissipated properly in a timely fashion, it can turn around and cause instability or outright damage to the chip.

This is why people can get monster clocks on current hardware when they cool it to subzero temps with Liquid N2 and such. They can pump 'em so full of juice that they can achieve incredible clocks...course, this sort of radical cooling has its own drawbacks, but that's another discussion.

Then of course, all chips have a ceiling, where no matter what you do, you simply won't get any more performance out of it. This varies chip by chip and is due to God-knows-what intangibles.
 
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