Nv 7800 GS AGP Volt Mods

[persivore]

For the Vdd mod, connect a 20k VR between the red pin and ground. Decrease resistance to increase voltage. The green pin in the above picture will read approx 0.2v (or more) lower than the output voltage of the regulator. I would recommend finding a capacitor which is connected to the green pin to use as a Vdd read point.

I'm 90% sure that the voltage being increased is Vdd, but there is a small possibility that it could increase a differnet voltage, so increase voltage slowly at first.

I'll take a look at the Vgpu mod later.

[Maviryk]

Woot. Vdd and Vcore, here I come!

Edit: Wait a sec... what's this "other voltage" you refer to?

[persivore]

Can someone check the resistance between the pin I've marked on the chip (pin 6) and ground please. Can you also check if the pin on the chip is connected to either of the 2 points I've marked on the resistors too.

(I hope Shamino doesn't mind me borrowing his picture)

[Maviryk]

Persivore if $oul hasn't given you any readings by the time I get home, I will get you some(about 2 hours). Currently stuck at work processing data.

[$oul]

Can someone check the resistance between the pin I've marked on the chip (pin 6) and ground please. Can you also check if the pin on the chip is connected to either of the 2 points I've marked on the resistors too.

(I hope Shamino doesn't mind me borrowing his picture)

Resistance = 38.90Kohm

the yellow points are connected to pin6 (the most left one is a free solder point)


Maviryk can you check this also, just for a double check cause the pins are VERY small

[Maviryk]

I will do it as soon as I get home tonight, no exact time though. A customer just came in with a project that needs to be finished by tomorrow morning...

[$oul]

so how's it going ?

seems like someone found out how to measure the vcore:
the point in the purple square is 1.3v in 2D mode and 1.4v in 3D mode (i tested this also)


as said in this topic:
http://www.mvktech.net/component/opt.../limitstart,0/

[Maviryk]

I forgot to take the DMM home last night after work. Will have to make sure to take it home for use this weekend. You have to keep in mind my card is on water and in an inverted ATX case, it's not very easy to take readings while lying down on the floor staring up at the case.

Thanks for that link $oul.

[persivore]

For the Vgpu mod, try connecting a 100k VR between one of the yellow points and ground. I'm not sure about the exact VR value, but 100k should be reasonably safe.
There's a possibility that there will be no voltage increase visible with a 100k VR. If this is the case, power off and decrease the resistance by a quater. Repeat this until the voltage starts to increase. If the voltage doesn't increase after reaching about 5k, I'll have another look at the mod.

note: XS owners and members will not be liable for any damage caused to you or your hardware, neither can be liable for any breach of the warranty.

[Maviryk]

note: XS owners and members will not be liable for any damage caused to you or your hardware, neither can be liable for any breach of the warranty.

Thanks for the vote of confidence there... hehe.

$oul if you do all these mods this weekend you'll have me beat as the first person to fully mod the GS. I may or may not be modding the card this weekend, my 510 DLX shorted out and I'm waiting for the RMA to come back. I'd prefer to have a good PSU to test out all the mods.

[$oul]

I'm looking to buy a watercooling block for 7800GS before I start modding, so you'l probably be the first, if no other 7800GS owners are reading this thread :p

[Maviryk]

I doubt you will be ever able to find one specifically made for it, unless people start buying GS' like hotcakes. You could try the ThermalTake Aquarius Bigwater II universal GPU block. But other than that one, you're going to have to mod your card and block, or have someone do it for you.

[Kin Hell]

I'm looking to buy a watercooling block for 7800GS before I start modding, so you'l probably be the first, if no other 7800GS owners are reading this thread :p

Yeah m8, I have an email here from Danger Den confirming their 7800 GPU water Block will fit correctly on the 7800GS. So you can H2O the Core & the Ram!

Nice movement on the progess here lads......thanks ever so much for ALL the input so far.

Respect & beers all round!

[Maviryk]

Yeah m8, I have an email here from Danger Den confirming their 7800 GPU water Block will fit correctly on the 7800GS. So you can H2O the Core & the Ram!

Bullsh t.

They don't even know that the PCB is different.

[$oul]

I doubt you will be ever able to find one specifically made for it, unless people start buying GS' like hotcakes. You could try the ThermalTake Aquarius Bigwater II universal GPU block. But other than that one, you're going to have to mod your card and block, or have someone do it for you.

I can make my own mount kits for gpu blocks, I work in a metalfactory as cnc programmer

[Kin Hell]

Bullsh t.

They don't even know that the PCB is different.

*Copy/Paste from Email body*

Hey Charles,

It will fit just right no problems.

Best Regards
Dan Stephens
dano@dangerden.com
www.dangerden.com







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BFG Nvidia AGP 7800GS OC

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Hi, Will your product http://www.dangerdenstore.com/produc...&cat=48&page=1 fit the New BFG Nvidia AGP 7800GS OC Regards, Charles Leach



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[Noxide]

I'm looking to buy a watercooling block for 7800GS before I start modding, so you'l probably be the first, if no other 7800GS owners are reading this thread :p

I'll try the 100k VR mod tonight. The mod on VR-Zone, removing the two resistors, didnt work on my bfg 7800GS. I'll let yall know how things go in a few hours.

[Maviryk]

*Copy/Paste from Email body*

Hey Charles,

It will fit just right no problems.

Best Regards
Dan Stephens
dano@dangerden.com
www.dangerden.com



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From: kinhell@nosey.com [mailto:kinhell@nosey.com]
Sent: Friday, February 17, 2006 3:18 PM
To: sales@dangerden.com
Subject: Danger Den: User filled in Contact Us form!



You have received this notification from Danger Den because you are a registered user or you or some other registered user requested some information for you from our store.

Customers need help!

Customer info:


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Charles

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Country:

United Kingdom (Great Britain)


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Phone:

01726 XXXXXX

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E-Mail:

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Department:

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Subject:

BFG Nvidia AGP 7800GS OC

Message:


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Hi, Will your product http://www.dangerdenstore.com/produc...&cat=48&page=1 fit the New BFG Nvidia AGP 7800GS OC Regards, Charles Leach



--------------------------------------------------------------------------------

Depending upon availability of product, orders are normally shipped within 24-72 business hours. Choosing Next Day, 2nd Day, Priority or any special expedited shipping method affects only the shipping time, NOT the processing time of your order. A shipment notification will be mailed to the email address on your billing account.

Danger Den
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URL: www.dangerdenstore.com

*edit: Email adjusted accordingly*

Ok, Kin Hell, spend 125 dollars and buy the NV78 block to put 7800GS.

I will be here laughing.

[Noxide]

Ok guys, heres the 411 on that "Yellow Dot" mod on the pic. Yes, they both rase the vgpu. How ever it shows to be very unstable. At least on my bfg.

The yellow point were the resistor is present shows to have more stability of the two points. Normal volts with out mod in 3D is 1.41-1.42. With mod I was able to get 1.43-1.44 volts. It will increase more but I wanted to start slow....LOL... Anywayz, I benched marked with Aquamark (less intence) at 475 core
1.35 mem. Modded & un modded. Of cores the modded way gave me a score of 81,110 and unmodded gave me 80,970. I ran it a second time to make sure but my machine crashed. Also keep in mind....I already have the "two resistor" mod from VR-Zone done on the card, so if anyone that hasnt done this mod yet, try the 100k vr mod and see what happends. And yes...the instant you start trimming down to like 70k-40k, the voltage goes up. So easy trimming!
Great work on your studies persivore. See what else you can find and I'll try it.
This card has some great potential. ...All we have to do is find out how to sqweeze it out with out killing it.

[Kin Hell]

Ok, Kin Hell, spend 125 dollars and buy the NV78 block to put 7800GS.

I will be here laughing.

With an attitude like that, I'm sure you would!

Looking at the pics I can get to on the Web, i'd say he was talking "arse" as well, but there ya go! Lots of em around isn't there!

Perhaps Dano needs telling he's talking bullsh*t!

Go for it Mav, you appear to have the balls!

[Da_maniaC]

Hey guys,

I've got an XFX Xtreme 7800 GS and it will not even clock past 460 / 1340 for some reason.

I've already tried different drivers, a bios mod for 1,5 v on the core but still no improvement at all.
(My PSU is a OCZ Modstream 450 so no loss in confidence there).

I am wondering if removing that current override protection will do the trick for me.
Anyone else experiencing this setback problem when overclocking one of these?

Or can anyone tell me which voltmod has proven to be the biggest success as of yet?
Im confused cause there are so many pictures here and i dont know exactly what to do...

Thanks for any help.

[Maviryk]

$oul, I doubled checked all the resistances, the numbers are good.

Persivore the 100k resistor is too small!

Noxide you need in increase it's size to about 200k and above. Currently I am using about 250k ohms of resistance, looking for the "sweet spot" on the card. It seems that if you give it too much voltage, it will crash, but too little and it will artifact. I am pushing 500mhz on the core ATM, have not messed with the ram voltages/times yet.

I removed the voltage regulation resistors before I read your post, maybe someone else should try the mod with them left intact and see what happens.

Will keep you up to date.

Here's to not frying the 7800GS.

[DFI pit bull]

I can make my own mount kits for gpu blocks, I work in a metalfactory as cnc programmer

Lucky bas***d!!!

[Maviryk]

Looks like VR came through with some mods, but theirs is different from ours...

http://www.vr-zone.com/?i=3317

I might try those mods tonight, I don't think the results from the current ones are very good.

http://www.ocforums.com/showpost.php...4&postcount=33

[Kin Hell]

I might try those mods tonight, I don't think the results from the current ones are very good.

http://www.ocforums.com/showpost.php...4&postcount=33

VDDQ: The supply voltage to the output buffers of a memory chip.