ok thanks ive soldered the vgpu point just need to ground then ill post some pics and results
ok thanks ive soldered the vgpu point just need to ground then ill post some pics and results
i dont think this vgpu mod works for the 4870. Ive done everything correct as in pic execpt i used a heatsink screw for the earth. When im turning the 50k vr there is no change from 1274v, which i had set in bios, any ideas?
Sorry it does work vgpu at 1.3v, i hadnt turn the vr enough how how can i push on stock cooler?
QX 9650 5ghz with 1.55v 4.8ghz with 1.5v 24/7 in a VAPOLI V-2000B+ Single stage phase cooling.
DFI LP LT X-38 T2R
2X HD4850's water cooled , volt modded
Thermaltake 1KW Psu
4x Seagate 250GB in RAID 0
8GB crucial ballistix ram
it wont damage card unless i give it too many volts just gota be carful right?
QX 9650 5ghz with 1.55v 4.8ghz with 1.5v 24/7 in a VAPOLI V-2000B+ Single stage phase cooling.
DFI LP LT X-38 T2R
2X HD4850's water cooled , volt modded
Thermaltake 1KW Psu
4x Seagate 250GB in RAID 0
8GB crucial ballistix ram
kk thanks . Would a 5k be better than 50k? i cant seem to find 50ohm vr in my local shop they only have 5k 10k 50k...........
Iam at 1.33v and if i go slightly higher screen goes blank and i have to restart? any ideas
QX 9650 5ghz with 1.55v 4.8ghz with 1.5v 24/7 in a VAPOLI V-2000B+ Single stage phase cooling.
DFI LP LT X-38 T2R
2X HD4850's water cooled , volt modded
Thermaltake 1KW Psu
4x Seagate 250GB in RAID 0
8GB crucial ballistix ram
Just found out my local shop sells 1k and 500r. which one is best?
lower the better. the 50 ohm was what the other tester (Theta) used.
QX 9650 5ghz with 1.55v 4.8ghz with 1.5v 24/7 in a VAPOLI V-2000B+ Single stage phase cooling.
DFI LP LT X-38 T2R
2X HD4850's water cooled , volt modded
Thermaltake 1KW Psu
4x Seagate 250GB in RAID 0
8GB crucial ballistix ram
Hey Dean, I can't find a 50 at my local store either. Let me know how the 500 works out for you.
Sorry for the delay - was away for the holiday...
You guys will need to order a 50 ohm, they're never in stores...
That being said, you CAN buy a 1k ohm off the shelf at almost any store (including radioshack)... BUT, be very careful, as the 50 ohms you need will me the last 3/4 turn of the 15-turn pot.
Lastly, you can use fixed resistors to get the desired voltage as follows:
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
CAUTION - I have not tried anything past 22 ohms (1.4v) on the card. So far, it has lived through all of the other voltages. The mod is successful, but I still need some help with BIOS modding to get some good clock numbers past 790.
try this to pass 790
http://www.overclex.net/data/images/...cktool-9.8.rar
Just to give everyone a heads up. Do not use the Zalman VF-900 with a volt modded 4850. Even at 1.21 load it gets very hot to touch. Granted I do have 85F room temp. But The AC S1 passive with good case airflow is beating the Zalman. under 60C full load. I don't have room for fans, but I will try to add them.
Desktop:
Antec 300
Foxcon A7AD-S 790GX
8GB Gskill PC-1066@5/5/5/12
PII X940 BE @3.6GHZ
Sunbeam Core Contact
2x 640GB in Raid 0+1
4870 512MB@800/1000
Vista Business 64bit W/ SP1
Why zalman vf-900 is so bad for modded 4850?I don't understand that..
E6300@3.3GHz|9700LED|965P-DS3(rev.2.0)|Corsair 2GB CL5|X1950PRO 256mb@vf900cu-led|Inter-Tech 420w@ZALMAN F3|WD 250GB|LCD LG Flatron 19"|Logitech G15v2|Razer DeathAdder|Steelpad 4D|Icemat Siberia+usb
Sorry for bad english :|
[SIGPIC]http://www.xtremesystems.org/forums/image.php?type=sigpic&userid=64028&dateline=119443 9396[/SIGPIC]
I know you did, but I just had to find out. I just can't believe how well the S1 handles this card passive with great airflow in my case. I have room for 2 80mm fans even with a small wireless card in my way. Gonna rig those up as well. But man I love this card. Playing Crysis at 1680x1050 and a popular custom config. Everything looks so good and now very playable. Should get a nice boost once I go for 750 again. I am glad I got the 4850. But what I don't understand is how ATI could ship the 4850 with the bios it had and how hot it was running. I remember how much heat the card at stock was dumping into my case. It was terrible.
You will be seeing my old 8800GT and G92 GTS in the FS section soon. =)
Last edited by vengance_01; 07-06-2008 at 11:25 AM.
Desktop:
Antec 300
Foxcon A7AD-S 790GX
8GB Gskill PC-1066@5/5/5/12
PII X940 BE @3.6GHZ
Sunbeam Core Contact
2x 640GB in Raid 0+1
4870 512MB@800/1000
Vista Business 64bit W/ SP1
My god, this card requires MASSIVE cooling for the voltage regulators. I had previously cut the original heatsink and used that, but over 1.4v it just gets into the 80c and over range. I just modded a cpu heatsynk to fit the voltage regulators and it seems cool, even in 3dmark06. Working on a beefy ramsink right now. Time to push to 1000mhz.
Big probelm! I done the vgpu mod succesfully and after testing stability in atitools artifact scanner it looked good but know when i run 3dmark06 my frames have dropped and i have loads of artifacts, its the same in crysis.
I did at one point boot with the volts at 1.7v could this have buggered the card? ow well back to the shop for a new one
just tried driver intall, still lots of artifacts on games and 3dmark, you think to many vol;ts?
QX 9650 5ghz with 1.55v 4.8ghz with 1.5v 24/7 in a VAPOLI V-2000B+ Single stage phase cooling.
DFI LP LT X-38 T2R
2X HD4850's water cooled , volt modded
Thermaltake 1KW Psu
4x Seagate 250GB in RAID 0
8GB crucial ballistix ram
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