8800GTS 512Mb (G92) vMods

[Zeus]

Wow, this Samsung mem is soo nice, it almost wants to make me get rid of this card and get me a new one with Samsung.

Oh well, 1150 on my Qimonda ain't that bad.

[STEvil]

I can run mine at 1150 as well (not sure its Qimonda even) but anything over 1050 when playing Grand Theft Auto: San Andreas will crash!

weird.

[ViperJohn]

I can run mine at 1150 as well (not sure its Qimonda even) but anything over 1050 when playing Grand Theft Auto: San Andreas will crash!

weird.

That is almost certainly Qimonda chipped then.

Viper

[wolfgang]

I have made a 50 turn vr with the range 475-270 ohms. Does that go low enough I would guess yes, but you never know. I have the samsung mem chips just want to make sure that the 20k is still fine with those. Thanks

[jason4207]

Well at least it starts at 475Ohms. You should be OK. Only way to know for sure is to try, but I'd guess you will be able to get at least a significant jump in vGPU. You should have very fine control of the voltage as well.

20k should still be fine on the Sammy RAM chips. Please post your results as I'm curious if the Sammy chips respond well to voltage. If they don't there is also a mod to reduce the voltage to the memory chips, but I don't think that'll be necessary w/ the Sammy's. The Qimonda chips definitely like less voltage, though.

[funkflix]

Recieved my second GTS today and it has samsung ICs too!

Hopefully i can run both at 900MHz core in SLI.

[funkflix]

Now i have installed the mod on the PNY too.



The Zotac for some compare -



A few minutes before the surgery begins.

[lachinois]

What do you guys use to glue these components to the PCB? Hot glue?

Lachinois

[Luka_Aveiro]

What do you guys use to glue these components to the PCB? Hot glue?

Lachinois

I believe it's double-sided-glue tape

[wolfgang]

I ended up using a 1kohm vr. Now, after I have completed the mod. When I check the ohms between the two points on the vr. I get 14ohms enough to sound the beep on my multi meter. I understand its not going to read 1000ohms hooked up but that close to zero bothers me. Is this normal??

NM, I found that the normal resistance is ~ 15 ohms. You guys prolly already new that tho.

[r4st4m4n]

What do you guys use to glue these components to the PCB? Hot glue?

Lachinois

Personally I just used super glue.

[funkflix]

I believe it's double-sided-glue tape

Yes. Much better then some super glue.

[Merkk]

Hey guys, I finally did my voltmod on my G92 GTS, but I'm rather disappointed.

The most stable thing I could get is 1.32V on load @ 850MHz core... a 50MHz increase... where my stock voltage was 1.2V on load

I'm using an Accelero S1 with Turbo Module for cooling. I would've thought that'd be enough to hit 900MHz core, but doesn't look like its the case... I know most of you here are using water cooling, which is not something I'm looking to invest in right now..

I'm using ATITool artifact scanner. The heat goes up consistently and the card usually starts crapping out at 60 degrees - which doesn't make sense cause it used to go to 70+ degrees on load with stock cooler when I overclocked...

I just get a lot of freezes on high voltages too (anything greater than 1.4V idle), even when temps are lower... does this have anything to do with OCP modding?

Can anybody share some advice?


ok here. just to give you an example; I bring voltage to 1.44 idle and 1.5 load. I set my frequencies to 875/1050, and its starts alright, I get a yellow dot or two, and then, once I go over 55 degrees, yellow blocks, lines, and then freeze... argh

[cole2109]

You have to high temperature!

[Merkk]

How is it high? Most people I ask say that anything under 80 degrees is fine... I'm running around 60 degrees on load with a voltmod... I think that's pretty decent for air cooling...

[Zeus]

Don't raise all core, shader and memory at the same time.

Rule out the memory by keeping it at stock speeds, then just raise core and gradually raise shaders little by little.

Yellow dots can be core but can also be memory, yellow triangles and squares on the other hand are most likely shadere errors.

More than anything else, try to keep the core temp below 50ºC, i've seen quite a few reports of the core getting instable over 50ºC.

[Merkk]

Yeah, I am keeping memory at stock speed, I just indicated that value to say which overall speeds I'm running at that stable, but when I'm testing the vgpu increase, I keep memory at stock, of course...


When I soldered onto the point, there are 3 optional places to solder surrounding it, I only soldered the one crucial point in the middle, think if I get the other points soldered in would give me better voltage fidelity?

[Zeus]

Nah, no difference since it's only the feedbackvoltage you manipulate with this VR, it triggers the IC to generate higher voltage, that's all.

Did you try to raise core/shaders unlinked?

[Merkk]

I'm trying this now in RivaTuner, what do you recommend I set the load/idle voltage as well as the core and shader to?

Like, what values have most people been getting?

[Zeus]

It depends on what you're after, for 24/7 stay below 1.3V idle, just to be sure.
Voltage ain't that important, just try to keep the core below 50ºC.

For benching, don't go over 1.47V idle but you will need much better cooling for that.

For example, with that voltage, mine stays around 34ºC idle 42ºC load, watercooled that is.

For results others are getting, read this thread:

http://www.xtremesystems.org/forums/...d.php?t=169870

[jason4207]

Get some better fans for your S1. Those turbo modules don't move much air. Also make sure to blow air all over the card w/ other fans.

The S1 is supposed to get comparable temps to a HR03GT; which I have. I get temps around 51* under ATI Tool load @ 1.35v idle. When idle temps are around 39.

I get 837/2106/1107 24/7 stable, and 864/2268/1152 bench stable at 1.35v idle.

These cards can operate at high temps, but they will run faster and more stable w/ cooler temps.

[wolfgang]

I did the mods was easier than I remember. I set the vgpu at 1.3 idle. The highest I can go is 850. Yeah, that kinda sucks temps stay below 35c. Now, the vmem mod I set at 2.1 from 2. I went from 1040 to 1100 and its not done. Played crysis for an hour or two at 850/1100. I will upload some pics if anyone wants to see.

[jason4207]

I did the mods was easier than I remember. I set the vgpu at 1.3 idle. The highest I can go is 850. Yeah, that kinda sucks temps stay below 35c. Now, the vmem mod I set at 2.1 from 2. I went from 1040 to 1100 and its not done. Played crysis for an hour or two at 850/1100. I will upload some pics if anyone wants to see.

Yes, let see the pics!

Let us know how that memory tops out.

[aussie-revhead]

Recieved my second GTS today and it has samsung ICs too!

Hopefully i can run both at 900MHz core in SLI.

Im hoping to do the same but mine will only be water cooled . I havent joined the phase/LN bandwagon yet . My first card is Quimonda chipped so I just know if I buy a second one and its samsung chipped then I going to want a second matching samsung chipped card .....

[wolfgang]

Here's the pictures of the vmods. I threw in a pic of the rad placement in this case cuz I like it.
I'll push this ram as far as it can go in a minute and be back with updates