Radeon HD 4850 Voltmods

[yanahs]

great.. thanx bro.. btw you got you4 4850 @850 on which mod? pencil or soldered

 

[Scrizz]

I got 850 on mine with pencil

 

[yanahs]

1.4 nice 850.. that means you only had to do the first pencil mod.? dude theres 3 measuring point why 3 is it like point one idel, point 2 load, point 3 i dont know.. or do we only have to read measure one of them?

 

[tomcug]

I overclocked my card to 850MHz with first pencil mod (1,38V). It won't make any difference which one of measuring points you'll use.

 

[yanahs]

ok thanx guyz will post results

 

[yanahs]

I've peciled my 4850 and I got it running up to 825/1100 but when I edit the bios to 850/1100 gpuz reports 825/1100 any ideas?
another thing is it possible to run 4850 x fire with a 500 watt pure psu?

 

[ViciousXUSMC]

I've peciled my 4850 and I got it running up to 825/1100 but when I edit the bios to 850/1100 gpuz reports 825/1100 any ideas?
another thing is it possible to run 4850 x fire with a 500 watt pure psu?

A 500w PSU would be pushing the limits severely I wouldn't attempt it especially with overclocks and volt mods. Something like a PC P&C Turbo SLI 510 would probably be fine, but your standard run of the mill 500w is gonna fall short.

 

[tomcug]

Really nice results If you want to overclock your card more, you can use AMD GPU Clock Tool instead of editing BIOS.

 

[yanahs]

Really nice results If you want to overclock your card more, you can use AMD GPU Clock Tool instead of editing BIOS.

I'll check it out.. but that means i've gotta do the other mod? i cant stick it with the current mod?

 

[tomcug]

Yes, you can stick with the first mod.

 

[yanahs]

is there an alternative to using pencil like a hair of wire which i could just tape on it? to reduce risk of degradation?

 

[me_martin]

Hi all, I just did the pencil mod #1 and i gott 1,495v, I did not expect that.
I used this for the mod : http://www.kemo-electronic.de/de/zubehoer/l100/index.htm
This is the english manual: http://www.kemo-electronic.eu/datasheet/l100.pdf
Is that substance to pure or what? Because 1,495v is way to high for my cooler.

 

[yanahs]

1.495 pretty big jump so what speeds are you hitting?

 

[yanahs]

@ tomcug
I've downloaded amd clock tool.. tried it but it wouldn't let me pas 750.. any ideas?

 

[tomcug]

I've never had such problems with this tool. Post a screenshot, so I'll be able to help you.

 

[me_martin]

1.495 pretty big jump so what speeds are you hitting?

I didnt max the card but I did get up to 917MHz
But unfortunately I had to remove the mod because of the temp

 

[sydbod]

@ tomcug
I've downloaded amd clock tool.. tried it but it wouldn't let me pas 750.. any ideas?

I believe reading that ATI/AMD have messed up the clock multiplier the same way as they did with the HD3xxx series so that one can not go higher than 750MHz.
If this is true, then the settings from around 830MHz should be OK again.

Can anyone confirm this information?

 

[mrg666]

Just stopped by to say thanks for the Vmod guide, bios file, and bios editor. I did the first pencil VGPU mod with my Visiontek 4850, flashed with newer version Powercolor bios, edited with RBE.

Stock Overclocked
Clocks 625/993 800/1100
VGPU ~1.1v ~1.26v
Load temp 48C 55C w/ Accelero S1+120mm_1500RPM_fan
Crysis GPU 33fps 39fps 15 loops, all high, 0AA
bench

Thanks again !!!!

 

[mYrAn]

Hi, i was just wondering how you can count what voltage you have? Ive done the 2nd pencil mod, the one where you draw on the PCB, and i went from 5.12 to about 4. My multimeter always jumps from like 1.3 to 1.4, so i dont know my exact voltage. So, is there a way to calculate what voltage my core is getting by having the ohm? And how high voltage is considered safe? Thanks in advance!

 

[me_martin]

I did the pencilmod #1 with a B2 pencil this time and got 820MHz on 1.25~1.26volt on the GPU.
My load temp is 42C and Idel is 35C
Just whants to thanks for this mod, nice work

 

[yanahs]

what was your temps before with 1.495v? that L100 stuff is pretty good huh? chemical store or do drug stores have em?

 

[yanahs]

just to make sure.. this first mod cant provide egough juice cannot kill my card right.. so it safe to say that I can use something with zero resitance on it?

 

[W1zzard]

just to make sure.. this first mod cant provide egough juice cannot kill my card right.. so it safe to say that I can use something with zero resitance on it?

yes if your resistance is too low, the voltage will go WAY high and WILL kill the card

 

[W1zzard]

Hi, i was just wondering how you can count what voltage you have? Ive done the 2nd pencil mod, the one where you draw on the PCB, and i went from 5.12 to about 4. My multimeter always jumps from like 1.3 to 1.4, so i dont know my exact voltage. So, is there a way to calculate what voltage my core is getting by having the ohm? And how high voltage is considered safe? Thanks in advance!

buy a better multimeter it's like $5

 

[cp#]

just to make sure.. this first mod cant provide egough juice cannot kill my card right.. so it safe to say that I can use something with zero resitance on it?

Show me something with zero resistance, please


I don't believe the people with 42-45C load temps. What cooler are you using? Please prove me wrong. I max out at 55C running the ATI Tool scanner with an Accelero S1