TI4200 Volt Mod?

**LardArse** · 07-01-2002, 04:36 AM

3.3 ns!
I'd be happy just to settle for 3.6 ns!

**2xD** · 07-01-2002, 09:08 AM

OK, measured out the resistance, and I'm getting 111 for the top right one (or was it left?

) and 102 for the other.

Didn't have anymore time to get to the electronicsstore, so them VR's will be something for tomorrow I hope.

Grrreat

**2xD** · 07-12-2002, 07:18 PM

Low folks,

by tuesday I should have my new SUMA GF4, and off course I'm going to Vmod it.
My previous attempt having killed my GF4 wont stop me

But, I want some explanation, basic explanation actually.
See, I really suck at electronics, and I mean that I don't even really know the basic stuff.

So, the card I'm getting is a 128MB SUMA Ti4200, it's on 8-layer PCB and carries 3.3ns BGA ram, according to the guy from the store I got it from, these cards do 690~700Mhz memclock on average. So I won't be touching the Vmem for now.

But what I wanna know is how to connect everything for the coremod in exact words.

What I assume is that I solder on a wire to the pin needed on the regulator (don't know which regulator it uses yet, but I think the SC1175), that wire goes to the middle leg of the potmeter (I use 4.7k pots), then another wire from the leg you measured out to ground. The pots set to 0 ohm, but I know now that I have to set them to max resistance, so 4.7K

Is it correct this way, or not?
Don't wanna fry another GF4, really don't

**dmitriyaz** · 07-12-2002, 07:42 PM

where did you get that card, and how much?

**2xD** · 07-12-2002, 08:41 PM

Originally posted by dmitriyaz
where did you get that card, and how much?

www.ldlc.fr
313e to my doorstep.

Noone that wants to answer my question(s)?

**dmitriyaz** · 07-12-2002, 08:47 PM

sorry for the annoyance, but how much is it in $$$?
and do you know if they ship to the US?

**LardArse** · 07-12-2002, 09:43 PM

The wire msut be soldered to the correct leg of the chip and the other end to your resistor. You must also have a wire from the other free leg of your resistor that runs to ground. Thats it basically.

**2xD** · 07-12-2002, 11:02 PM

Originally posted by dmitriyaz
sorry for the annoyance, but how much is it in $$$?
and do you know if they ship to the US?

one Euro is 0.99$, so it's 315$

(lotta money for a Ti4200 huh?

)
And no, they don't ship to the US, not as far as I know at least.

LardArse, thnx for the explanation, makes me feel a bit more confident

**~~qwerty57~~** · 07-13-2002, 03:20 PM

Can you guys help me with my volt/mod. Ok I have a Ti4400 and it uses the sc1175 for GPU/volt. and it is at 123 ohms my question is that before you stated that start your 5k pot at 20x that number why is this like turning the resistance off totally untill you turn the pot to where you want it? also if I connect a 5k pot set it at 5k will it affect my 1.66v alot or not at all..thanx

**LardArse** · 07-14-2002, 03:45 AM

Just set the 5k resistor at ~ 5k and after soldering, slowly decrease the resistance and check the voltage consecutively.

**X Men SS** · 07-17-2002, 10:05 AM

LardArse , what resistance do you use for the VMem ???

**LardArse** · 07-17-2002, 10:20 AM

I think I started with around 2k, and that gave around 3.34v and then slowly went down. But for 4ns rams I have, it doesn't help much at all.

**spaceboy** · 07-23-2002, 08:25 AM

if i have a SC1102CS chip why don't do this mod?

soldered a 1kOhm resistor to pins 11 and 14 of the SC1102CS chip:So, the R8/R7 ratio (in the typical application circuit scheme) changed and the regulator's output voltage grew from 1.66V to 1.81V.

and this for sc1175csw

Vout1 was increased with the help of R14 720Ohm resistor, which was soldered to pins 18 and 20 of the controller chip.
The graphics memory voltage increased up to 3.09V

**sysfailur** · 07-23-2002, 12:40 PM

Might wanna use VR's though, not just resistors

**spaceboy** · 07-23-2002, 01:21 PM

Originally posted by sysfailur
Might wanna use VR's though, not just resistors

k but instead of solder a Vr to the pin and ground..
ins't better to solder to pin from pin lke these?

can i fry the card if i test the vgpu with the pc on?

**sysfailur** · 07-26-2002, 12:05 AM

Well I wouldn't directly solder the VR on.... use some wire. ;P

**SKATAN** · 07-26-2002, 05:54 PM

I have a Msi ti4200 and te pcb seems to be the same as abit siluro ti4200

but the regulators have the same size but are

sc2602s
0219
g28995-2

an i cant seem to find the pdf for these at semtech maybe they are just too new

does anyone know where to find these?

**LardArse** · 07-26-2002, 09:13 PM

http://www.xtremesystems.org/forums/...&threadid=1355

**SKATAN** · 07-26-2002, 10:28 PM

thankz for the reply

so i guess it´s the same pin11

what was your gain from 1.66v to 1.81v ?

and the gain from the crappy stock cooler to peltier ?

**LardArse** · 07-27-2002, 02:46 AM

No idea. Went straight to pelt before overclocking the core.

Went up to 2.1v and the max I could manage was 345mhz core that seemed stable but didn't test it that long cos my mobo/PSU can't keep up the high voltage and shut off. Right now its 340 Mhz at 1.96v.
Tell me how much yours overclock, especially interested to find out about your memory overclock. 600 memory works fine for a while but turn up the resolutions + FSAA and stuff and artifacts start appearing. Only 580 artifactless for all situations. Be careful with the memory voltage because I fried my previous GF4's ram with too much voltage.

**SKATAN** · 07-27-2002, 08:17 AM

it does 625 without a single artifact

hynix -3.6

the gpu is crap 297 for 24/7 usage

**LardArse** · 07-27-2002, 12:02 PM

Well you have better luck, mine's 4ns Samsung

**spaceboy** · 08-07-2002, 02:15 PM

Originally posted by SKATAN
it does 625 without a single artifact

hynix -3.6

the gpu is crap 297 for 24/7 usage

Hi

did you do the mods Skatan?

**RichBa5tard** · 08-09-2002, 01:04 PM

Well, I just received my GF4 Ti4200 today, and it seems to be performing very well.

Brand: "Xelo" (Cheapest I could get in EU: 150$)

Core seems to go up to 330 with stock cooling. 3D marks craps out after a while though: cooling is utter crap and GPU get's really hot. I'm going to slap op my DD WB on in a few minutes. Keep you guys posted.

Mem seems to be average: 4ns Hynix, does 580 without artifacts and run hot.

**SKATAN** · 08-11-2002, 05:05 PM

Originally posted by spaceboy

Hi
did you do the mods Skatan?

nope

i´m thinking if it´s worth the risk

i moded my previous gf3 (non ti) and the gains where great

20 mhz on gpu and ram

the ti´s dont seem to gain that much with vmod , only extreme cooling

I just wish that there was a good vmod to the gf4 ti4200 ram as there was for my EX gf3

and the gf4 gpu gets very hot without the mod , and vmod needs very good cooling

if i was convinced that it would give me 20+ mhz on the gpu setting the voltage to 1.74v i´d do it without thinking just for benching

(i have pretty good soldering skills

)

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