8800GT voltage mods

[DesertShooter]

Fyi, it artifacted. See how it's been running for 48 seconds, but no errors for only 16? That means there was an artifact.

Also it says your PCIe slot is at 1x?

you're right, but 15 sec atitool stable is enough to run 3dmark.
and that pcie speed, thank you for mentioning, because i couldn't find the reason for the low framerates

[nfm]

Here's my XFX 8800GT XXX, I feel ripped off $310:
864Mhz Core, 1053Mhz Mem, 1.39v Load


I bought the wrong HR-03 version, stupid me I had to do some mods:


Here's the vcore mod, no need for vmem since it does 2100Mhz easy:


The HR-03 w\ 120MM Yate Loon 2200RPM works very well, 33C idle and ~45C load with volts 1.2-1.39v (22C ambient)

Somebody figure out OVP mod, I want 900Mhz

[GTXVotrEX]

Hi need.for.mhz

I have the Same card, i cannot push my core past 780 then i get Artifacts in ATItool.

[nfm]

Hi need.for.mhz could you help me.

I have the Same card, i cannot push my core past 750 then i get Artifacts in ATItool.

I need you to tell me if there is anything i can do to push it further.
Please help me out

I hear you bro,
Are you using stock cooler? Any volt mods? My card was stable 720-738Mhz core at stock. Your card seems a little better. How is your memory, can you run 2106Mhz easily?

I was just benching 3dmark06 with 918Mhz on the core at 1.49v load, it ran couple minutes and then ovp kicked in and card halted I did it with ovp mod using 4.1k ohms and 3.1ohms, it didn't work.

[GTXVotrEX]

Yes stock fan, no volt mods this will be my first.

What would you suggest i get my hands on to pull all this off.

I push my mem to 1000 in riva tuner. does that mean 2000?

[scottc19]

Hey I did the volt mod, but am still waiting on a water block so I havent pushed it very far yet, however I have a problem. My problem only occurs after waking up from sleep mode. After it wakes up, about 5 or so minutes later the video card crashes and the screen goes black. This usually happens when I'm on the internet. However if it did not come out of sleep mode and just normally booted up the card runs awesome with everything including serveral hours of crysis and such. Im running vistax64 anyone have any ideas or had a similar problem?

[revogamer]

anyone know a site which sells 1k VR's and ship internationally?

[jason4207]

Hey I did the volt mod, but am still waiting on a water block so I havent pushed it very far yet, however I have a problem. My problem only occurs after waking up from sleep mode. After it wakes up, about 5 or so minutes later the video card crashes and the screen goes black. This usually happens when I'm on the internet. However if it did not come out of sleep mode and just normally booted up the card runs awesome with everything including serveral hours of crysis and such. Im running vistax64 anyone have any ideas or had a similar problem?

Known issue. Try the latest beta forceware drivers...169.12.

[Astennu]

What kind of cooling are you guy's using when running 1.3 or 1.3+ volts ?

[scottc19]

Is anyone using the arctic cooling s1 cooler? if so how is that working for you and what are your temps / overclock...

Also looks like someone saw this thread and decided to start selling it ?

http://cgi.ebay.com/WOW-Nvidia-8800G...QQcmdZViewItem

[Aldy402]

first time dealing with soldering, help a beginner out
everything is clear to me but..
where is this ground point? its not labeled in the pics

[scottc19]

they are the blue dots in the picture of the first post...
http://www.xtremesystems.org/forums/...1&d=1196804211

first time dealing with soldering, help a beginner out
everything is clear to me but..
where is this ground point? its not labeled in the pics

[hifiking]

What kind of cooling are you guy's using when running 1.3 or 1.3+ volts ?

I'm using an EK waterblock. max 45C load temp, 3DM06 stable at 864 core.

1.354v

[Hazaro]

The HR-03 w\ 120MM Yate Loon 2200RPM works very well, 33C idle and ~45C load with volts 1.2-1.39v (22C ambient)

Somebody figure out OVP mod, I want 900Mhz

OCP mod (Maybe)

I don't believe those temps are load at 1.39V on air...
What are you using for load? And is it the card temperature or core?

[Mysterfix]

The OCP mod has been figured out by need.for.nfm

I removed the corresponding resistors on my GT to disable the overvoltage. Card still overvolted but guess what Nick? Card does not shot down anymore no matter what voltage. I did some preliminary testing upping card to 1.6v in 3DMark and 1.5v in Crysis. I ran 3DMark06 at 918Mhz and played Crysis at 900Mhz!

Let my need for mhz begin

Not exactly, card still overvolts. At 1.50v idle it overvolts close to 1.60v (firefly 3dmark06). Looks like OVP does not exist on 8800GT , once you disable OCP through removal of two resistors, card will never shut down.

These are same resistors (x78 value) nick removed from a gts, and his effect was no more vdroop.

Great job! I already tried it on my card and it worked like a charm! Running 1.49v load without a hickup.

[nfm]

Great job! I already tried it on my card and it worked like a charm! Running 1.49v load without a hickup.

Now show me some results! I found out that above 1.5v load gives minimal improvements.

[hifiking]

Removing the x78 resistors does indeed work, I'm running the core at 1.5v now, but the OC isn't stable over 890.

[cowie]

yes same here with ocp mod 870 or so1.48v,

[Mysterfix]

Done a few test and 900mhz at 1.48v is the max for me but that only got me a few hundred points in benchies. Anything above 1.5v is useless for me as the core and shaders do not benefit from the extra voltage at all.

[winbond]

Done a few test and 900mhz at 1.48v is the max for me but that only got me a few hundred points in benchies. Anything above 1.5v is useless for me as the core and shaders do not benefit from the extra voltage at all.

900mhz core with what shader clock and for how long?? cause i can play for like an hour on 864/2160 core/shader before it crashes

[hifiking]

I just did the vmem mod, but when my VR is set to 20komh vmem is 2.1v

So is it overvoltet stock, it's the MSI OC version, stock at 650/950. Volt's isn't helping at all on mem.

[winbond]

Volt's isn't helping at all on mem.

that has been determined somewhere at the beginning of the thread

[Astennu]

i have seen X1900 perform better with lower mem voltages to bad we cant adjust voltages in software like you can with the X1K and HD2K cards.

[Pacha]

The OCP mod has been figured out by need.for.nfm



Great job! I already tried it on my card and it worked like a charm! Running 1.49v load without a hickup.

can you guys tell me what iron do you use to unsolder this resistor? I have a crappy 30W one and I feel it won't be enough powerful to unsolder it, what do you think?

[NightRaven]

30w surely nope