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Reload this Page EVGA 8600 GTS - How to vmod? (HiRes pics included)

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Old 06-27-09   #1 (permalink)
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Default EVGA 8600 GTS - How to vmod? (HiRes pics included)
Hi!
So I have been searching around since yesterday for a proper guide to vmod my 8600GTS (EVGA 256-P2-N761-TR), but it seems that it's not the same layout as what I have found for other GTS's, not even the reference board...

Here is what the card looks like, and what may be the Buck PWM Controllers (Although I don't know which one is which):

Front


Back


full size of back




The marked controllers are the ISL6568CRZ and the ISL6549CBZ (Click for data sheet).

from here on, how do I proceed with the pencil mod? Where are my measuring points?


Since I'm going to get a new system soon anyway, I wouldn't mind fiddling around with this one and see how far it goes



Thanks in advance!
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Old 06-30-09   #2 (permalink)
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Hmm... bump?

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Old 07-05-09   #3 (permalink)
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Can you measure the voltage of the chokes on the board to get a voltage reading? The choke which gives a reading of about 2v will be the one for vmem the other for vcore.

Now IIRC some 8800GT's used ISL6568CRZ for vcore control so it might be for that on this card but measuring the chokes would help
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Old 07-05-09   #4 (permalink)
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What are chokes?

Sorry for my noobness...

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Old 07-05-09   #5 (permalink)
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Circled are the chokes

The IC closest to the choke that reads 2v is the one that will control vmem the other vcore.

The trimmer will go from the FB pin to the GND pin, the data sheet will say which pins theses are.

To figure out what resistor you need; measure the resistance across the FB and GND pins. Multiply this resistance by 20 and this is the VR required.

EG: if resistance across said pins gives 824ohms then its 824x20 = 16480.

So a 20k vr would be perfect.

Hope that helps, no vmod master by any means.
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Quote:
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Ah the dickery.

Sadly enough, I don't like being a dick in game. It's much more fun flaunting your junk IRL.

System: 24/7 rig, now with less powah than the bench
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W3540		 Motherboard
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Old 07-06-09   #6 (permalink)
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Thanks, I'll give this a go


I just mounted a Scythe Musashi onto the card, but it can't be inserted since it touches the PCI slots below -.-

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Old 08-28-09   #7 (permalink)
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How'd you get on with it?
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Quote:
Originally Posted by Tator Tot View Post
Ah the dickery.

Sadly enough, I don't like being a dick in game. It's much more fun flaunting your junk IRL.

System: 24/7 rig, now with less powah than the bench
CPU
W3540		 Motherboard
Evga X58 LE		 Memory
3x2GB OCZ Golds 		Graphics Card
Evga GTX295
Hard Drive
Perc 5i; 4 WDC3200AAKS's Raid 5, 1TB Caviar Green		 Sound Card
Asus Xonar D2X		 Power Supply
1000W Thermaltake modular		 Case
Lian Li PC-A71
CPU cooling
EK-Supreme/BIX420		 GPU cooling
EK full cover		 OS
Windows 7 Pro - Retail MSDN-AA		 Monitor
20.1" LG
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Old 09-18-09   #8 (permalink)
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BZ is the mem voltage controller [pin4 to VR for vMEM]..RZ is the GPU voltage controller [pin 6 to VR for GPUv] ...

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