try an other Bios ;)
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try an other Bios ;)
Will try, thx for the tip ;)Quote:
Originally Posted by Vatos_locos
does anybody have the problem that 3 to 5 trys are needed to boot a system with an OC HD4850?
When my sytem was off for a few hours, i can turn it on but screen stays black. Can do this several times. Sometimes i need to disconnect PSU and connect it again. Board is an P5K-E with 480 FSB. PSU has 1200 W Silverstone, 28A on 12V per rail.
Tried some newer P5K-E bios versions, nothing helped. Any ideas?
So I have a couple quick questions before attempting this mod after reading virtually the whole thread. I just want to be clear on what I need to do:
This will be for a Visiontek 4850 under water cooling. Current temps are 32c idle and 37c load with ambient of 25-27c.
1 - Theta stated earlier that if you want a specific voltage you could use a fixed resistor:
10 ohm fixed ~ 1.566v
15 ohm fixed ~ 1.465v
22 ohm fixed ~ 1.400v
27 ohm fixed ~ 1.375v
33 ohm fixed ~ 1.355v
Does this still hold true?
2 - Where do you measure the voltage to see if it worked or not? On the card while it is turned on? In windows? Can you just connect a 12v PSU to it and power it on to see the voltage without having it installed on a MB?
3- Where am I measuring resistance at, between the two solder points?
4 - I grabbed this pic from earlier in the thread showing where to solder for both GPU and Mem voltages. Is it correct?
http://img205.imageshack.us/img205/4303/picxz4.jpg
By utnorris at 2008-11-08
Voltmod http://www.powercolor.com/Global/pro...ProductID=2355 confirmed working. 10 Ohm fixed and a 50 Ohm in series.
This card is benchable around 880 gpu w/o mod. Expect at least 950 after mod. Testing about to commence :)
I have an Asus EAH 4870 512mb non-reference card.
http://www.techpowerup.com/img/08-09-02/51b.jpg
My thoughts about it can be read in this post. The card does really weak on the core overclocking. Perhaps i might do a mod and see if that helps. Unfortunately i don't seem to find any info on voltmodding this card. Any help would be appreciated.
Thanks!
nice..Quote:
Originally Posted by roger_h99.nor
can you confirm the 3x 47uf poscap on your 4870
http://www.edc.sanyo.com/english/pdf/poscap/E42.pdf
thanks
trez0r some hight res. pic's of the card would be helpful :)
Hi, can not recall to have seen caps similar to those in the pdf, but if you could suggest where to look for them, I'll sure have a closer peek.Quote:
Originally Posted by NapalmV5
Tried 5 different BIOSes, none worked :(Quote:
Originally Posted by Vatos_locos
I guess ill need one from a Powercolor/Club3D 4850 with DVI-HDMI-DisplayPort, which I couldnt find.
I would be tankfull if somebody that have one of this cards could upload a copy.
Hi friends. I received my 4870 sapphire from rma.... but... this 4870 have blue pcb and i would like to do a vmod. Someone know if the vmod is the same , like 4870 with red pcb?
kur¡, is the layout same? Same IC?
my friend has the same card as youQuote:
Originally Posted by ceemic
How can he make pencil-mod for vcore ??
thanks in advance
Duniek, I'm not that confident on pencil moding. I don't like pencil mods, because they are not that reliable and it's bigger possibility to kill the card. I don't see there any SMD resistor that could be pencil-moded. The only point where GND is other spot:
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG
I have done on that exact spot, I did it for a friend that didn't want soldering on the card.Quote:
Originally Posted by ceemic
It works fine, just have to be very carefull with the pencil.
Lowering #14 -> gnd resistance to ~950ohm give around 1.4V on the GPU.
NBF, tnx! Yep, it should work. It's vital to measure resistance drop after every pencil stripe...
thank you:up:Quote:
Originally Posted by ceemic
it works, but one more question I hope last
where he can measure vcore on gpu, I mean which point or points I should check?
Will the 4830 mod in the same way as the 4850 do you think?
I'm thinking of saving a few £££ and going for a 4830 and using good old modding and overclocking to get more bang out of it.
Hopefully not the bad, electrical, flashy kind of bang though :rolleyes:
Jimbo Mahoney, You have to know what PWM controller there is. Do some macro close-up's from IC and PWM.
But u told that 4850Ics can handle only up to 2 phases? What about Gigabyte Blue UD and Gainward GS 4850? Both looks like an 4+1 design...Quote:
Originally Posted by largon
Barr3l Rid3r,they have other ICs which can operate with more phases? :rolleyes:
How do I explain why I get black screen with the Core over 835MHz?
locked bios maybe ? try one from the Internet
8800's@over, save the BIOS with GPU-Z and then open it with newer RBE. So You'll see the max limit and can edit it too...