700mhz wall on HD4850 is smashed.

[regenade]

^^Well just tried the gainward Golden Sample bios out now on my Sapphire reference card , and it was giving a few red dots on some parts of the screen after the boot up. Flashed back to the powercolor bios and everything is back to normal. Seems the ram-timings are different :P

[praesto]

Do you guys think the 8-pin pci-e cable for the gainward 4850 golden sample will allow for higher clocks?

[Oese]

the golden sample will clock good especially on the ram i suppose and is an overall nice card. the cooler as well...

i think without watercooling i would consider to buy it.

when you want to apply water i'd choose cheapest card available and mod biosses etc myself.. 8pin connector does not help in oc. the 6pin of an decent psu has enough power. its added just to comply to the pcie specs.. pwm's would be a decision maker, but i dont know about the gs pwm's whether they are different... the pcs+ seems to have different (and supposedly better) pwm's.

@ caped crusader: i think this is also the cause for the problems we have with cat 8.8...

[Caped Crusader]

Do you guys think the 8-pin pci-e cable for the gainward 4850 golden sample will allow for higher clocks?

Don't think so... the card already has all the power she can eat, but no harm in trying I suppose...

[binormalkilla]

I still can't seem to get my card to run 1.2V via BIOS mod....I only read 1.8V max while in 3d. I've tried 1.2, 1.21, 1.3, and 1.35 in RBE to no avail.
What voltage are you guys entering in RBE to get 1.2V? I noticed some of you are leaving the voltage blank....is that on hard mods, or what?

[arroyo]

I still can't seem to get my card to run 1.2V via BIOS mod....I only read 1.8V max while in 3d. I've tried 1.2, 1.21, 1.3, and 1.35 in RBE to no avail.
What voltage are you guys entering in RBE to get 1.2V? I noticed some of you are leaving the voltage blank....is that on hard mods, or what?

Use 1.158 V. This is the max value, that can be set for HD4850. This will give you 1.2 V measured by multimeter.

[binormalkilla]

Use 1.158 V. This is the max value, that can be set for HD4850. This will give you 1.2 V measured by multimeter.

All right I'll give it a shot. Thanks man.

[DemonEyez]

Just a question: Does 0.8ns allow you to overclock higher? Or are they just faster...what exactly does this value mean? :P

0.8ns means you can do 1000/08 = 1250

So with a chip rated at 0.8ns, theoratically you can reach 1250MHz with that chip.

So in theory these Samsung 0.8ns (1250MHz) chips are higher/better rated than those Quimonda 1.0ns (1000MHz) chips, that's theoratical.
In practice we see that the Quimonda chips can do 1200Mhz with slightly higher voltage.
Would be nice if those Samsung chips have the same potential after a voltmod

Can't wait to see the first voltmod and results for those Samsung based cards. Because running the GDDR3 on a HD4850 @ 1300Mhz or even 1400MHz would have a substantial positive effect on the memory bottleneck

And why is that exactly? Different timings/volatge maybe? (noob question)

The mean difference would be in the subtimings of the ram chips. Is those are to different - and most of the time they are - you'll get screen corruption or end up with a card that will not boot at all!

[Slovnaft]

hey guys, er, I just flashed my 4850 BIOS and it went a little sour (I used win ati flash...). Anyways, I have a BIOS on a thumb drive and a BIOS on my desktop, but how can I flash one of them back, as I can't boot into windows, I'm not sure how to boot into DOS (man thats embarrassing), and even if I was I'm pretty sure I deleted ATI Flash (the DOS flash utility).
haallp...

[Oese]

@ demoneyez: how much voltage do the quimonda need for 1200? i tried 2.1v and that did not make them any faster.. edit: tried 2.2, again only minor advantages..

btw guys i tried that recipe for v-modded bios and cat 8.8.. uninstalled 8.8, cleaned registry, used driver sweeper newest version, flashed stock bios, rebootet a few times, installed cat 8.8 again, rebooteted few times and then started with modding the 3d-vgpu in the bios. result: 1.158v works fine, but dioes not push the actual measured volts, anything above that will black screen... so no way really here..

used rbe 1.13 for trying that out like it was written here..

[binormalkilla]

Ok I flashed 1.158V today and it looks like it's the same....however I noticed that when I used the middle left ground point I measured 1.21V, and if I used the front ground I ground I got 1.17V....weird.
Well I guess I'm stuck at 750 MHz on the core.....I'm going to test more just to make sure. I don't even think I'm %100 stable at this, as I froze up in Crysis and got a VPU recover once when playing on Very High.....I don't ever get that in COD4 or CSS.
I'll try to shoot for higher memory too.

Do any apps support Crossfire 4850 OCing in Vista x64 yet? I've always just flashed the BIOS.....

I just tested 760 MHz on the core and it was Vantage stable (ran it twice, no looping option on Vantage AFAIK), so I think I'll flash it to 760. I tried 770 but I got an error in the middle of New Calico.

I'm going to test some higher memory clocks later tonight or tomorrow.

[Oese]

i think oc to max 700/1200 will work with the ccc in cf mode.. perhaps 720/1200 with a hash modded bios..

[DemonEyez]

@ demoneyez: how much voltage do the quimonda need for 1200? i tried 2.1v and that did not make them any faster.. edit: tried 2.2, again only minor advantages..
...

Quimonda like lower voltages, 2.2v is way to high.
Try to get 2.075v on the spot and you might get lucky More users have reported this as a sweet spot, and it work for me too
I can do 1225 MHz with 2.075v but after 45 minutes of AtiTool I get slight artifacts. 1200MHz is completly stable

[Oese]

awesome, will try that... never tried anything between 2.1 and stock.. will do right NOW

[Oese]

mmh did not make 2.075v, but 2.08, 2.055, 2.045, 2.035, 2.025 and 2.015v. so far it worked best at 2.045v getting 1175mhz near atitool stable 1200mhz only minor artifacting, but both not stable. 2.055v was worse as was 2.08v. but big improvement whatever, before 1150 was heavily artifacting, now stable... but i stay at 1125 for so long, 1150 does not make a difference and 1175 and 1200 (i wanted) are not stable... but perhaps i'll try some precise pencilling again tomorrow

but it could be heat related too. i dont have full watercooling, only gpu, and some alu heatsinks on rams and pwm with kinda thick pads.. will change those perhaps, at least on the pwm..

[praesto]

I've received my gainward 4850 golden sample. As we all know, how things work in reality and how things work in theory rarely go 100% hand in hand :P, and it's the same with my gainward 4850 which supposedly has samsung 0.8 ram specced to run at 1200mhz or even more. My 4850 shows artifacts even at 1175mhz...I was really expecting more

[Oese]

perhaps some more volts...

[Draxx]

So whats the difference in setting 1.158v in CCC Overdrive profile (which it sets itself after an autotune) and 1.158v BIOS voltage?

[EightyDuce]

I was able to hit 1225 on ram with 2.15v but only after adding active cooling (40mm fan) over the v-regs. I'm going to mount a 120mm fan to the card to blow over the ram chips see if that helps..maybe pump more voltage though it.

I will try to play around with lowered voltages see if that helps, just like my old 8800Gt with Quimonda chips, which ended up running higher clocks stable on lower voltages.


EDIT: Ok after going back to check on Furmark, 1225 started to artifact after 37 min....so yeah, I spoke too soon, she's not stable. Back to the drawing board.

[TI66ER]

Heres my highest with the bios modded to 1.158v

[BAGZZlash]

RBE v1.15 is ready for download!

That's the changes:

v1.15
- Fixed bug causing an error message on loading several BIOSes (small ones like several 3870 X2 BIOSes).
- Added remote control feature for WinFlash to acquire and flash BIOSes from within RBE. Will be included in the tutorial soon.
- Superior PowerPlay should be available for more 4870 BIOSes now.
- Added link to the tutorial in the menu bar. (Info... Tutorial on how to use RBE (websource)...)
- Added display for the card's internal voltage table (it's in the clock settings tab).
- Fixed a bug causing the device ID being written incorrectly if it's changed in rare cases. Coded this very drunk, there might be bugs... :-/
- Added some nice method one hack signatures (4850, 4870 X2).
- Added a feature for method one overdrive hack signature saving and loading.

Have fun using it and please be sure to make extensive use of the signatures exchanging thread!

[Monkeywoman]

can someone upload a Diamond 4850 bios? i have maxed out at 721CORE and 1130MEM on stock voltages with thermaltake dualorb cooler using rivatuner.

[jason4207]

Has anyone had any luck getting a modded BIOS working w/ newer CAT releases? I can download 8.10 now, but I'll stick w/ 8.7 if its the only way to keep my low 2D voltage/clocks, and high 3D voltage/clocks.

[3BABY]

Hey all,

So.. i been following this thred since day 1, had a couple 4870's they were nice.. and just had to try the 4850's.. im lovin em!! after abit of screwing around with bios's.. and alot of thanks to all yall for the info in this thred.. thought id throw up a pic of the improvement that can be gained out of these card.. so Cysis Bench.. only DX9 sori..(XP on this bench disk). but the numbers.. from stock 625/993 at std volts all round.. to 851/1150 @ 1.34/2.11 respectively. just gota love this "cheep" solution to a 4870..

[Barr3l Rid3r]

Has anyone had any luck getting a modded BIOS working w/ newer CAT releases? I can download 8.10 now, but I'll stick w/ 8.7 if its the only way to keep my low 2D voltage/clocks, and high 3D voltage/clocks.

Using 8.10 here and works fine.

New Bios mod for use in ATi 4850 512mb Qimonda w/ or without default cooler.

Improovements:

1) Less Clock and voltage while in Idle mode, bringing better durability an lower idle temps.

2) Higher voltage and default 3D VGPU Clock while in FULL load mode (680/1000Mhz).

3) Higher overclock limit in default ATi CCC driver (800Mhz GPU highest setting) and also better overclock ability cause of the higher default 3D voltage.

4) Adjusted Default cooler fan speed adequately, to keep it cool and quiet.

http://rapidshare.com/files/148699499/4850mod.rom.html



And that is custom made one for hardmodded cards.





Idle GPU @ 400Mhz 1.02V







Full Load GPU @ 830Mhz 1.33V




How to


Windows XP, use last Ati Winflash utility, for Vista must do via DOS floppy disk or Pendrive w/ booting abilities.

Pendrive:

1) Get HPBOOT

http://rapidshare.com/files/107282064/HPUSBFW.zip

2) Get BOOT Files

http://rapidshare.com/files/107282214/USB-Boot.zip

3) Unzip All for both and run HPBOOt, select your pendrive, check quick format and create DOS startup disk, files located at: choose extracted folder containing Boot files.

4) Get and unzip ATiflash 3.60 and then copy the extracted files to your pendrive don`t forget the bios file 4850mod.rom linked above.
http://www.techpowerup.com/downloads...lash_3.60.html


5) Set pendrive as first boot and also first disk in your motherboard bios.

Run:

Atiflash -f -p 0 4850mod.rom

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