*** NVIDIA 8800GT OVERCLOCK ***

[imported_Shaq]

Originally posted by: shaolin95
Well, mine seems to stop at 725 stable but tried 731 and got errors in 3 mins. Load temp was 67C and shader locked at 1753. I will try some benchies and perhaps use the window cooler but I wanted to have a regular idea of its OC capability at normal room temps before using the cold air from the outside.
I havent installed the PCI slot cooler I got yesterday since its blowing out and not in as I thought...it could help but I didnt feel a lot of strenght in its pulling to be honest.

Do you guys think running the fan at 100% could be bad?

PS from 701 to 725 I increased the avg fps in the Crysis benchmark from 30 to 33 at my very high settings...not bad a 3 fps increase at this levels.

ahh..you have a KO. Is that as high as it will go on air? Or room temperature air anyway? The SC will do 725/1750. How high will the memory go?

 

[shaolin95]

Room temp is 73C right now. I havent pushed the memory as I have been scared reading those comments about the memory dying when running at its natural 2000 speed. I tried Crysis at 2000 and didnt notice any difference (then again it was just 25mhz difference).
Not sure if I want to try memory OCing right now. I know I got LifeTime warranty but still.

It seems my card is not a great OCer but I will take 725 happily as a bonus anyway. BTW, when you say the SC will do, do you mean as in your SC cause as you know, when OCing there are no guarantees.

 

[imported_Shaq]

Every SC I've seen on the web will do 720/1800/2000 or higher. That is subject to change based on seeing more results. It looks like the KO and SC are binned together and the KO just has a higher BIOS setting. I haven't seen any SSC OC results yet but that should go even higher. The reference EVGA's I've seen struggle to get 700/1750/2000. My reference XFX got there but it won't go any higher.

 

[TraumaRN]

Just messing around with my Evga SC card memory is fine to about 1050 then craps out in most games...the core I managed to run it for a few minutes at 740 with the stock cooling turned up to 50% fan speed, but it'll lock up in some of the newer heavier games, it'll do 725 just fine for everyday useage....but still playing around with it to see what the max really is...

 

[shaolin95]

Are you testing ATITOOL...in games I can do higher but I am using atitool and as soon as I got 1 single error I call it failure. Just trying to play it safe.

BTW, by using the window air duct I get a solid 63º load right now at 725 but I know it can be better as its not been directed to the card but to the CPU (the air duct) and also its a very long duct and the fan pulling the cold air in is not very powerful...must use my other Delta.

 

[imported_Shaq]

As soon as you can get load below 50C there should be some OC benefits. Do you have any pics of it yet? Or you could just describe it. I am thinking of fabbing something this weekend. How cold is it there now?

 

[jonnyGURU]

Originally posted by: HostofFun

Originally posted by: Deleted member 4644
I have an eVGA SuperClocked 8800GT. Running at 702/1728/1000 with zero problems. Core temp is somewhat alarming at 76 C under load.

Anyone know what the core danger level is?


Edit: I am now running at 700/1750/1025 at about 70C with a monster fan setting (90%ish). Seems stable.

This is a monster card...

I saw jonnyguru, a renowned power supply expert, say that his contacts told him manufacturers had issues with 2000+ ram dying after a few weeks' use, to keep it below that. As far as core, sky's the limit, whatever your cooling can handle... some have made it upward of 760 on stock, and we're already seeing some results of 800+ pop up on water/high-end aircooling.

The RAM doesn't die. The RAM is perfectly capable of running at 2GHz. It's the interface that can't handle it, making for irrepairable boards. The problem with getting high core clocks is just the suck ass single slot cooler. Resolve that issue and > 700 MHz

 

[imported_Shaq]

So is 2000 safe? If not what is safe level?

 

[shaolin95]

Originally posted by: Shaq
As soon as you can get load below 50C there should be some OC benefits. Do you have any pics of it yet? Or you could just describe it. I am thinking of fabbing something this weekend. How cold is it there now?

I will try some pics in about 2 hours but its very getto
It was 31ºF in the morning and its 54F right now at 4:30PM so I assume its gonna be a low 30s or so night.
I am gonna install the Delta fan so that some of that cold air actually makes it to my pc and also will get a PCI slot cooler to pull the air in as the one I bought actually is pushing out.

With my current air duct fan I can barely feel the air coming out of the air duct.

 

[Deleted member 4644]

The concern I have about what JonnyGuru is saying is this....

If 2000 is a sure kill... that means that 1950 isnt safe either.... or even 1900 for that matter...

So... I guess I will back down to at least 1900 for a while and see if we start seeing any bad news from the more adventurous.

 

[shaolin95]

Well I got the advanced RMA with cross shipping 2nd day delivery from eVGA so I will start running my memory higher but I dont think Ive noticed any improvements by doing so, so it doesnt make much sense.
At least I broke 11K in 3Dmark 2006 with my Opty 165 at 3006mhz..not bad for my opty.

BTW , I still owe those air duct pics, promise to post them today as I already took them yesterday. Was getting a load of 58C (atitool) with my temp reading of the air coming out of the air duct at 54C....a 4C difference seems too good to be true but I like it as I was getting up to 77C when I first got the card.

 

[Gautama2]

^^ I'm still waiting for those pics man

 

[Hazaro]

The RAM is rated at 1000Mhz, that what the chip says on it.

I'm not pushing it now though

740/1890/999 UT3 stable
713/1728/999 Crysis Stable
3DMark06... We will find out

With an Accelero S1 of course, 52C load baby!

 

[GeneralOreo]

Originally posted by: Deleted member 4644
The concern I have about what JonnyGuru is saying is this....

If 2000 is a sure kill... that means that 1950 isnt safe either.... or even 1900 for that matter...

So... I guess I will back down to at least 1900 for a while and see if we start seeing any bad news from the more adventurous.

"2000 is a sure kill" doesn't include the EVGA SSC card right? I mean it's an official card and they're the ones that set it to 2000, it shouldn't die after a few weeks. They must've done a lot of testing for these things.

I'm planning to buy an SSC as of right now, unless the 2000 RAM speed does turn out to be a problem or Nvidia announced much better high-end cards.

 

[Hazaro]

Want to chime in here. 1000Mhz looks like the max, even at 2.05V (Stock = 1.8V)

It dies if you slightly go past it (1020 at 850 core and 2000 shader) :shocked:

Yay for volt mods! Loosening timings didn't help either, kind of surprising...

Anyway, http://aycu40.webshots.com/ima...443728973421347_rs.jpg

...is my 151 minute accidental run of ATiTool at 713/1728/999. (I left it open when I was web browsing, crysis doesn't take anything higher, but UT3 can take 740/1890/999)

 

[n7]

Yeah if you guys want to see what the card is really capable of, run the ATiTool stresstest...nothing is quite as sensitive to OCs as it is i've found.

 

[Capt Caveman]

Originally posted by: jonnyGURU

Originally posted by: HostofFun

Originally posted by: Deleted member 4644
I have an eVGA SuperClocked 8800GT. Running at 702/1728/1000 with zero problems. Core temp is somewhat alarming at 76 C under load.

Anyone know what the core danger level is?


Edit: I am now running at 700/1750/1025 at about 70C with a monster fan setting (90%ish). Seems stable.

This is a monster card...

I saw jonnyguru, a renowned power supply expert, say that his contacts told him manufacturers had issues with 2000+ ram dying after a few weeks' use, to keep it below that. As far as core, sky's the limit, whatever your cooling can handle... some have made it upward of 760 on stock, and we're already seeing some results of 800+ pop up on water/high-end aircooling.

The RAM doesn't die. The RAM is perfectly capable of running at 2GHz. It's the interface that can't handle it, making for irrepairable boards. The problem with getting high core clocks is just the suck ass single slot cooler. Resolve that issue and > 700 MHz

So Johnny, are you saying that every eVGA SSC will die in a few weeks?

 

[lil buttercup]

Wait til tomorrow.... Anyone get a Zalman VF1000 on theirs yet? I will have mine to play with a eVGA SC 8800GT.

 

[chizow]

Anyone noticed a high-pitched buzzing coming from their case? Its intermitten, but I've definitely noticed a buzz, like a really high Hz whine that goes on and off. Only noticed it recently after I installed the GT but its really hard to isolate. I thought a fan or HDD may have come loose when I installed the GT but tightened everything up and the buzz still happens.

Anyways, didn't really have any time to run other games/benches although I did fire up Crysis SP demo. Plays pretty smooth up to 1650 with Medium settings, @33FPS in the benchmark. The transitions did seem a little jerky on the fly-by, although I'm not sure if that's caused by the scripted pursuit angles. Didn't really notice it in the actual game and it seems more pronounced at higher resolutions.

Did have one system restart @729/1000 while playing LOTRO....so I'm not totally convinced my OC is stable despite countless hours running ATITool overnight or completing multiple loops of Crysis Demo. Overall the card certainly feels less stable/lower-quality than the GTS/GTX parts. Wouldn't be surprised of JonnyGuru and his sources were correct saying the GT uses lower quality PCBs, although they looked pretty similar to the GTS reference boards in reviews. I guess NV had to cut costs somewhere.....just make sure you get a warranty you trust.

 

[walk2k]

If it's not completely stable at 700/1000 I would just drop it back to stock (650/950) and keep your warranty. Already that's only what... a 5-6% OC, which will not even get you 2 fps in the 30-40fps range (where you might want an increase, I mean who cares about 73 fps vs 70, or 106 vs 100....)

Just MHO of course. I know it's fun to push it and see how far you can go, but I've never found 2-5% overclocking worth the trouble (or the risk) in real world applications.

 

[swtethan]

im home, time to overclock

 

[swtethan]

Currently I am at :


743 core/ 1857 shaders / 2026 mem

zalman vf1000 keeping things cool at 60c load

 

[swtethan]

I rate this tread 5 stars!


since I am top ocer lol

 

[thejez]

what are you guys doing to validate your overclock works? running ATITool stress test for a few hours or something?

 

[swtethan]

Originally posted by: thejez
what are you guys doing to validate your overclock works? running ATITool stress test for a few hours or something?

you only need about 10 mins of testing with atitool but to be sure, run for 30 mins artifact scan