TI4200 Volt Mod?

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10-21-2002, 10:25 PM
Dirty_Punk

Quote:

Originally posted by sysfailur
I've done 1.92 on the gpu w/ aircooling, and 3.93~ on the ram w/ air (on 4ns ram).

can you read your resistances values? :)
10-21-2002, 11:54 PM
sysfailur

Quote:

Originally posted by Dirty_Punk
can you read your resistances values? :)

Not w/o disconnecting the solders... no :(
10-22-2002, 01:53 AM
morphling1

Hey great thread btw. I finaly got my gf4 4200. Leadtek Winfast 64mb oem (just old GF3 reference cooler on) . Guess what I'll be doing next :D. I just measured the default voltages 1.65 and 3.25V card overclock to 325/610 without artifact.
Next I slap on my GF4 waterblock you can see in liquid cooling and then lets see where I can take it.
10-22-2002, 04:03 AM
N8

Quote:

Originally posted by sysfailur
Not w/o disconnecting the solders... no :(

Why couldn't you just measure the resistance across the VR, sys? :)
10-22-2002, 04:13 AM
aarion

i can't find any where that they selll such a big ramsink like yours.
10-22-2002, 04:21 AM
N8

aarion,

I believe he cut those ramsinks from some sort of CPU heatsink. Old CPU heatsinks make great ramsinks if you own a hacksaw :D
10-23-2002, 06:36 AM
Goldlocke

sysfailur, do u have Heatsinks on your RAMs? there not on the pics!
10-23-2002, 07:25 AM
N8

Goldlocke,

You can see them on these 2 pics :)

http://www.maximumoc.com/img/hardwar...s/top_sho1.jpg
http://www.maximumoc.com/img/hardwar.../side_shot.jpg
10-23-2002, 08:02 AM
aarion

the thing is how you stick it onto the ram??????
10-23-2002, 08:08 AM
N8

You've basically got 2 options.

1) Frag tape which is OK at passing the heat from the chip to the heatsink and is pretty easily removed if need be. I'm not sure where to buy this stuff but I know it came along w/ my TT ramsinks).

2) Thermal epoxy which is better than the tape for conducting heat but can be a VERY permanent solution if you don't mix some compound with it. The Arctic Alumina Epoxy(don't use the Arctic Silver Epoxy because it can conduct electricity which is bad for all those pins on the ram chips) can be found just about anywhere selling PC parts.
10-23-2002, 11:52 AM
sysfailur

Quote:

Originally posted by [N8]
You've basically got 2 options.

1) Frag tape which is OK at passing the heat from the chip to the heatsink and is pretty easily removed if need be. I'm not sure where to buy this stuff but I know it came along w/ my TT ramsinks).

2) Thermal epoxy which is better than the tape for conducting heat but can be a VERY permanent solution if you don't mix some compound with it. The Arctic Alumina Epoxy(don't use the Arctic Silver Epoxy because it can conduct electricity which is bad for all those pins on the ram chips) can be found just about anywhere selling PC parts.

Thanks for linking Goldlocke ;) I would NOT use fragtape though. That stuff doesn't stick at all, well at least what I've been using doesn't and it's a pain to get on as well. If you don't want a permanent solution just use small globs of AS Epoxy, instead of a whole bunch.
10-24-2002, 04:52 AM
Goldlocke

320/685MHz

Hmm,...I got mine right now at 320/685MHz stable.
VGPU is 1,77V
VMem is 3,93V

GPU acts strange: doesn't want more than 1,80V regardless of the MHz. Can't get her over 320MHz stable in 3DMark. Probably cooling is not enough (waterblock by aquacomputer.de).

@ sysfailur and DDTung: thx for your research! But, sysfailur, is there space between your DIMM and that huge Ramsinks on your vidcard? (I had to use a flat heatsink on the upper rightmost Chip, otherwise would have blocked DIMM1&2).
10-24-2002, 08:12 AM
Goldlocke

update: 320/695MHz

YEAH! - BABY - YEAH! ;)

695MHz DDR on RAMs now :D . without artefacts in UT2k3 and 3DMark.
still my GPU sucks! any suggestions?
10-24-2002, 10:39 PM
aarion

goldlocke, can i have some pic on your card? one thing i found out, beside the rams there this small chips that are higher than the ram which is blocking when i'm trying to put the ramsink on to it.
10-24-2002, 11:18 PM
sysfailur

Re: 320/685MHz

Quote:

Originally posted by Goldlocke
Hmm,...I got mine right now at 320/685MHz stable.
VGPU is 1,77V
VMem is 3,93V

GPU acts strange: doesn't want more than 1,80V regardless of the MHz. Can't get her over 320MHz stable in 3DMark. Probably cooling is not enough (waterblock by aquacomputer.de).

@ sysfailur and DDTung: thx for your research! But, sysfailur, is there space between your DIMM and that huge Ramsinks on your vidcard? (I had to use a flat heatsink on the upper rightmost Chip, otherwise would have blocked DIMM1&2).

You're welcome! (Slow it may have been on my part though :P)

And to answer your question, IT BARELY FITS!! hehe - It's a very very tight fit on my 8k5a3+ and on my IT7 I just miss the last Dimm slot.
10-25-2002, 04:08 AM
N8

Yep, thanks for the tech help DDTUNG, and all u other guys that had the balls to try it b4 I did. It took me a while to convince myself that I wasn't gonna fry my card but I tried it last night with some clips rather than soldering & was successful.

Ended up @ 357/695 w/ no artifacting and stable thru multiple passes of 3DMark. This is with custom air-cooling on the GPU and no ramsinks...3.9v to the memory and it never even got over 27c - measured w/ a laser thermometer pointed on the chips. I'm wondering just how much voltage this memory could handle, hehe...cuz its definitely not getting hot. Was afraid to go any further :)

My core already clocked well(335 b4 volt mod) so I was actually kinda surprised it only went to 357MHz @ 1.9v. I think with 2v or more it would do 365ish but I'm afraid to send that much to it. Highest temp measured from the back side of the GPU was 43c.
10-25-2002, 04:38 AM
svol

I have a MSI 128MB GeForce4 Ti4200 card and I al;ready soldered the wires to the chips and I'm now ready to attach the vr's. I have watercooling on my GPU (no peltier) and RAMsinks on the 4ns Samsung RAM chips... any idea what the maximum voltage would be without frying my chips? I don't have those handy temp measurement tools and have to do it with a diode and I don't know how accurate they are.
10-25-2002, 04:57 AM
N8

Well, if you've got watercooling on ur GPU then I'd guess its running cooler than mine under load...and you've got ramsinks on ur memory while I don't. I'm assuming the Samsung's stock voltage is similar to the Hynix's(3.31v) and if so I don't see why your card couldn't handle 1.9v/3.9v as mine did. Mind you, the cards ARE different & I don't want you to fry ur card so go slowly and in steps...if anything gets weird, back off.
10-25-2002, 06:24 AM
Dirty_Punk

anyone of you can read the resistence value for GPU 1.9-1.95V & DDR 3.9V???
10-25-2002, 06:59 AM
X Men SS

I guess that someone didn't read the whole thread ;) !

Here it is (page 5) :

http://www.xtremesystems.org/forums/...9565#post29565

Quote:

posted by macci

Im using 1kohm VRs for both GPU and MEM. That is pin 11-14 on SC11012

Vgpu:
1kohm => 1.75ish
350ohms => 1.9ish

Vmem 800ohms => 3.65ish
10-25-2002, 07:26 AM
Goldlocke

1 Attachment(s)

@ aarion: right you are about the capacitors near the RAMchips. That 2 Capacitors beside each RAMchip is indeed ~ half an millimeter higher than the RAMchip. :( I had to cut my heatsinks to fit! :(
10-25-2002, 07:27 AM
Goldlocke

1 Attachment(s)

MSI VGPU

2nd for aarion...
10-25-2002, 07:28 AM
Goldlocke

1 Attachment(s)

MSI VMEM

3rd for aarion...
10-25-2002, 07:30 AM
Dirty_Punk

Quote:

Originally posted by X Men SS
I guess that someone didn't read the whole thread ;) !

Here it is (page 5) :

http://www.xtremesystems.org/forums/...9565#post29565

i have done a different mod, with pin11-VRs 5k-ground, and it has a different value ;)

please, can anyone check the resistance value to obtain 1.9 & 3.9 or 1.95 & 4v
10-25-2002, 11:26 AM
Per Hansson

I've done the v-mod now

The card is a Gainward TI4200 (not golden sample) with 64mb of 3,6ns EtronTech memory

The thing is that increasing the v-mem doesn't help at all, I've been up to 3,8 volts (default is 3,5 on this one) and I get just as much artefacts as without the v-mod... (621,5 is fine, 634,5 gives artefacts...)

I have put ramsinks on the card, aluminium ones from Thermaltake

UPDATE: Putting a big 120mm YS-Tech fan blowing some 130cfm of air onto the card seems to help, guess the ram was getting too hot with the increased voltage...

However I still can't go high, I can get 634,5 artefact free now but when I bump up to 650 I get artefacts galore all over the screen...

And funilly enough increasing the voltage above 3,60v doesn't seem to do anything bar give more artefacts...

--

The core does show some improvments however, I haven't pushed it but now that's it lapped (which did 8,5mhz in itself) i can reach 340mhz @ 1,78v (haven't tried higher) with stock air cooling (before was 328,5)

But still, is it really possible that increasing the v-mem doesn't yield any benefit at all?

http://hem.spray.se/hanzzzon/Pict0238.jpg

*don't mind that circuit on the right; it's a fan controller...

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