7800GTX overclocks with Volt Mods??

[WA2]

Is ther any information out yet about the vmods for this card? I need to egt this baby oc'd...to the xtreme.

[Malves]

Post pics of the card if you have it.

[ViperJohn]

Post pics of the card if you have it.

Malves the 7800's are using an Intersil ISL6592 for the Vcore and the datasheet is as incomplete as you can get.

Memory is using a Intersil ISL6534.

I can shoot you shoot real tight hi res macro's if you want. Just need to know where to send them as they will be far to large to post here.

Viper

[Benny Lodewijk]

@viperjohn : please send the picture to me.. benny_nejkt@yahoo.com. Many thanks..

[ViperJohn]

@viperjohn : please send the picture to me.. benny_nejkt@yahoo.com. Many thanks..

These will be pictures of the regulators and surrounding SMD's not of the Vmods. Intersils datasheet on the ISL56592 Vcore regulator gives generalized marketing type description, a pin out and that is it. No operating parameters, no description on pin functions, no VID programming table, no nothin' useful lol.

Viper

[Malves]

Hey there, man. Long time no see. Yes, please email those pics to me.

[ViperJohn]

Hey there, man. Long time no see. Yes, please email those pics to me.

Will shoot them tomorrow for you when I have some good light.

Viper

[Malves]

Cool! Thanx, man. Also, do you have the card? If you are willing to poke around, we may be able to work the mod out. But for now, it looks like VDD mod is pin 4 to pin 15 of ISL6534. Just gotta work out the resistance needed, after we confirm that.

[Tom Holck]

Please work fast

The bios can only give 1.4 volt. 1.5volt setting don't help as on 6800U.

hardwaremod is needed.

[ViperJohn]

Cool! Thanx, man. Also, do you have the card? If you are willing to poke around, we may be able to work the mod out. But for now, it looks like VDD mod is pin 4 to pin 15 of ISL6534. Just gotta work out the resistance needed, after we confirm that.

Yes I have the card here now. The card uses the 32 leg QFN package on the 6534. Pin 10 (FB3) traces out to what appears to be a divider. The high side SMR goes to the output of the Vmem PS but the low side SMR reads 11K to ground Could be another padding SMR downstream but I can't find it to confirm. That would not be typical either.

Did you take a look at the 6592 datasheet. What a joke lol. I guess the chip is so new Intersil hasn't completed it yet.

Viper

[ViperJohn]

Cool! Thanx, man. Also, do you have the card? If you are willing to poke around, we may be able to work the mod out. But for now, it looks like VDD mod is pin 4 to pin 15 of ISL6534. Just gotta work out the resistance needed, after we confirm that.

Just emailed the 7800 regulator pictures to you. I can send the TIFF's if you want a larger FoV.

Viper

[Malves]

Thanx, man. Just got them. Now I see the ISL6534 is not the TSSOP config. Looking at the specs for it, it looks like FB2 is the pin for VDD mod. With the confing used on this card, it's pin 32. Could you check volt and resistance on pin 32, plz?

That pdf for the ISL6592 really doesn't help much. But we can start checing volt and resistance on pins 12, 24, 36. Even thou, I think it could be pin 12 the one we want.

Persivore should give us some help here, too. Ima ask him to stop by.

[persivore]

Without seeing the card, its hard to tell which of the feedback pins on the ISL6534 is controling Vdd, but if Malves thinks its pin 12 (FB2), I'll go with that
The ISL6592 datasheet is somewhat...useless. It should be possible to work out which pin is feedback tho from checking the voltages on some of the pins which could be feedback (like pins 12, 23, 26, 27, 28)

[symbolized?]

C'mon guys... the vmod is needed anyway and some of u did it already... I totally don't care if i'll have to cut something with razorblades.. but my card is still waitin' for more voltage in order do perform a little bit faster on DICE.... -.-"

[harleybro]

Here ya go persivore. Hope these pics work. Once again thanks for helping with that x600.

[VoRtAn_MaDgE]

If the vga arrive soon at store i will take some macro shot's real close, just tell me the ic's u want guys!

[ViperJohn]

Thanx, man. Just got them. Now I see the ISL6534 is not the TSSOP config. Looking at the specs for it, it looks like FB2 is the pin for VDD mod. With the confing used on this card, it's pin 32. Could you check volt and resistance on pin 32, plz?

That pdf for the ISL6592 really doesn't help much. But we can start checing volt and resistance on pins 12, 24, 36. Even thou, I think it could be pin 12 the one we want.

Persivore should give us some help here, too. Ima ask him to stop by.

Haven't been ignoring you. My dad has been in intensive care on a resperator that last couple of days with more tubes plugged into him that fully WC'ed SLI rig. The 7800 in not exactly on my mind at the moment and my customer knows it.

*************Edited out do to error information*******************

It sure would be nice if NV numbered all the SMR's. Between that and the worthless 6592 datasheet it is hard to describe what is going where.

Viper

[Malves]

Without seeing the card, its hard to tell which of the feedback pins on the ISL6534 is controling Vdd, but if Malves thinks its pin 12 (FB2), I'll go with that

I said pin32 for vdd, bro.

Attaching the pics John sent me. Sorry to hear about your dad, man. Hope everything turns out good.

[ViperJohn]

If the vga arrive soon at store i will take some macro shot's real close, just tell me the ic's u want guys!

We already have them or at least Malves and I do.

Viper

[Vapor]

Here ya go persivore. Hope these pics work. Once again thanks for helping with that x600.

OT: what kind of epoxy did you use (or whatever you used to attach the Ramsinks) and what is the other thing you sinked? Does it help?

[Malves]

Please, keep discussion on topic. You guys can talk about that thru PM.

[ViperJohn]

Haven't been ignoring you. My dad has been in intensive care on a resperator that last couple of days with more tubes plugged into him that fully WC'ed SLI rig. The 7800 in not exactly on my mind at the moment and my customer knows it.

*************Edited out do to error information*******************

It sure would be nice if NV numbered all the SMR's. Between that and the worthless 6592 datasheet it is hard to describe what is going where.

Viper

Okay I pulled my head out of my ass deleted out the bad info above.

On the ISL6534 Vmem regulator.

Pin 10 (FB3) goes straight to ground.

Pin 29 (FB1) goes a through 513 ohm SMR to ground.

Pin 32 (FB2) goes to Vmem B+ through a 4.02K SMR. Pin 32 also reads 4.07K to ground (solid) like it is also traced to a voltage divider low side SMR. I just cant find it nor is there a traces to one. What I though mignt have been the low side SMR is just SMR is series with noise suppresion caps on both sides.

Either the Pin 32 is picking up the 4.07k to ground internally (not according to the datasheet) or another trace runs under the chip then drops into a though plated hole to a PCB sandwich layer to pops up who knows where. It does appears that a trimmer from pin 32 to ground will mod the memory. Considering tolerance it appears it is a simple 50% voltage divider.

Viper

[ViperJohn]

Okay we have a Vmem mod. A 100k trimmer (it measured 99.7k max) from pin 32 to ground increased the Vmem from 2.079 at the Windows Desktop to 2.164. 8 1/2 turns in (about 66K) gives 2.200 even at Windows Desktop.

The mod is pretty simple as there is pad for the automated test systems to solder one pot leg to and a 805 sized cap right next door for the ground solder point.

Will shoot some pictures tomorrow whan I have some light to work with.

Viper

[harleybro]

Very cool Viper John lookin forward to the pics.

[symbolized?]

Very nice... well done
Only Vcore is missing to make me completely happy - on vrzone a guy reached with a vcore mod 630 mhz on air... :-/