700mhz wall on HD4850 is smashed.

[Battlestar]

Anyone had similar issues on my prob?

Hi I have a problem regarding the RBE latest version. I set the fan into default settings and it shows on GPU-Z 50% fan speedand it drops my temps from 72deg to 61deg , my problem is it underclock my GPU Clock into 500Mhz but the Default Clock remains 625 Mhz with same Memory 993Mhz I think. Is this normal? Sorry I can't provide screenshot still here @ the office Anyways, I revert my default BIOS and still waitin' for your answers

Hmm Im not sure buddy, But Im pretty sure when you check on GPU-Z under Graphics Card Tab at the botton you can see this following:

Using RBE with 50% FanSpeed (I used the Set all fan settings to recommended values that's why came up 50% FanSpeed)
GPU Clock: 500Mhz Memory:9XXMhz
Default Clock 625 Mhz Memory:9XXMhz

Also on GPU-Z Sensor Tab:
GPU Core Clock: 500Mhz
GPU Memory Clock: 9XXMhz

My Default BIOS
GPU Clock: 625Mhz Memory:9XXMhz
Default Clock 625 Mhz Memory:9XXMhz

Another thing, I don't see anything this kind of tables on my latest RBE
*See attached file with red box



Im using WinXP SP3
Sapphire 4850

[Pt1t]

When i edit bios , fan speed is ok but GPU clock max to 700 and vGPU doesnt change.

[darkskypoet]

@Battlestar: I am also missing the area indicated by red box, however, I just used the graph and bumped the minimum up, and steepened the slope some. However, Sensors (page in GPU-Z) doesn't accurately report GPU speed when operating in 3d mode, just sits at 500 all the time... Not sure if this is just cause its early, or what.

Also, my down clock to Power State 1 (power play 2d setting) doesn't change clock speed at all. So I'll try another setting... Perhaps I just have to use the right numbers. Can anyone confirm if changing voltage in Bios with RBE actually works? Or are we bound to mod for voltage tweaks?

[Battlestar]

@Battlestar: I am also missing the area indicated by red box, however, I just used the graph and bumped the minimum up, and steepened the slope some. However, Sensors (page in GPU-Z) doesn't accurately report GPU speed when operating in 3d mode, just sits at 500 all the time... Not sure if this is just cause its early, or what.

Also, my down clock to Power State 1 (power play 2d setting) doesn't change clock speed at all. So I'll try another setting... Perhaps I just have to use the right numbers. Can anyone confirm if changing voltage in Bios with RBE actually works? Or are we bound to mod for voltage tweaks?

I see, can you please provide a screenshot when you got an satisfied settings on RBE? Thanks

[darkskypoet]

@Battlestar; just PM me and I'll email you one of what I have that works fine for my fan speeds. I don't have power play under clock working yet.

[DemonEyez]

I was wondering, does the voltage control actually work? If so then hard-vmodding would be absolete, right? Nice!

[gurusan]

I have tried putting the voltage adjustments up to 1.4v but this results in only 1.21v...which is still .05v over stock so it's a small increase and allows you to go to 725-750 core.

[Pt1t]

I have tried putting the voltage adjustments up to 1.4v but this results in only 1.21v...which is still .05v over stock so it's a small increase and allows you to go to 725-750 core.

Could you post RBE frequency tab shot ? With 800mhz 3D core. When i try 800 or more than 700mhz, results is max 700mhz

[DemonEyez]

Okay, good to know before hard modding, I want to find out what the max is of my core.

Could you post RBE frequency tab shot ? With 800mhz 3D core. When i try 800 or more than 700mhz, results is max 700mhz

Take a look at this shot. it's my bios for 710core and Powerplay at 160/500 in 2D.


Just replace al of the 710's with 800's (and giveup your corresponding voltage) and it should work. And disable Overdrive in Windows, or it wil override your setting of 800

[gurusan]

Could you post RBE frequency tab shot ? With 800mhz 3D core. When i try 800 or more than 700mhz, results is max 700mhz

You need to disable overdrive, otherwise CCC will force it back to 700mhz I did this mistake as well.

[Pt1t]

You need to disable overdrive, otherwise CCC will force it back to 700mhz I did this mistake as well.

Thanks, and for vGPU ? you just type ~1.3v for 3d settings voltage and it works ? Because i have only 1.17v in load ^^

[gurusan]

For me the vgpu only allowed me to go up to 1.21v through the bios

[Pt1t]

For me the vgpu only allowed me to go up to 1.21v through the bios

for 1.21 , you put 1.3v ?

[gurusan]

I put 1.400v actually and it only got me to 1.21v

[biftek.]

What drivers are you guys using? The Hotfix I presume?

[darkskypoet]

@biftek: Yep. Although, I never really encountered any stability issues with 8.6.

[aldamon]

I can already bet that the 4870 will come out 10% ahead if not higher just from my experience with the 3850 vs 3870. Get a 4870 and clock it to 900MHz

So 10% is worth 2x the price?

Can someone elaborate on how much memory bandwidth the 4850 needs? How much is performance scaling on the 4850 with this new BIOS? I was leaning towards a 4870, but this BIOS hack is blowing my mind.

[zbomb5610]

i got my visiontek 4850 doing 725/1050 no problems so far. what benches are you guys using for stability on these cards since ati tool doesn't work? I remember using the fur renderer when i had my 8800gt and it killed 2 of my cards and i know of several other people that had their cards die on them, so i don't really want to use that for stability testing.

[gurusan]

For anyone who is interesed, I have modded the 4850 MSI bios....not only have I raised clocks and voltage under load, but I have improved on the powerplay feature as well as the fanspeeds. IMO this is how it should have been shipped from the factory...it is a bit loud while gaming and such but this way the cooler is actually effective!:

2d clocks
.98vGPU, 160core/500mem

3d clocks
1.20vGPU, 720core/1100mem

Download here
http://cid-dd5c526e6044c7cc.skydrive...ru4850Bios.bin

The fan will only go down to around 25% in idle and 2d clocks, but it's pretty much inaudible and during 3d clocks should keep it under 70c full load, more like mid-low 60s.


All the reference 4850s should be able to do this, but if you are getting crashes then I can make you up a slightly less aggressive profile, or you can edit it yourself with the RBE tool. I recommend stress testing with rthdribl and some Crysis benches.

[Battlestar]

Hi Gurusan,

It seems your pretty active on this thread Can I ask a favor? Could you make me one that comes with:
GPU Clock: 675Mhz
Memory: 1000Mhz
FanSpeed 60% on Load and 25% on Idle?
Clock Info1:160/500?
Clock Info2:500/750?
You may DL the stock BIOS of my card here: http://www.techpowerup.com/vgabios/i...ace=&memSize=0
Thanks-Battlestar

[annihilat0r]

Great work people! How about putting in some benches? The memory can hardly be overclocked and I wonder if with such aggressive core clocks (such as 925MHz :O) the card is bandwidth starved?

For example, a comparison benchmark between 800-900MHz would do the trick

[Caped Crusader]

Thanks gurusan!! this will come very handy!! I did my own profile with RBE too, but I couldn't fiddle with vgpu settings. I might give this one a try after lowering the core and mem freq. to a more acceptable 680/1075 (these ones I know my card can handle...)

[albon]

One could explain me what is the difference between State 1 and State 3 in RBE ?
And now much can we increase Vgup ? Is there a limit ?

[gurusan]

Hi Gurusan,

It seems your pretty active on this thread Can I ask a favor? Could you make me one that comes with:
GPU Clock: 675Mhz
Memory: 1000Mhz
FanSpeed 60% on Load and 25% on Idle?
Clock Info1:160/500?
Clock Info2:500/750?
You may DL the stock BIOS of my card here: http://www.techpowerup.com/vgabios/i...ace=&memSize=0
Thanks-Battlestar

Try this, the fan profile may not be exactly as you want it, you can play with the slope using RBE:
http://rapidshare.com/files/12540238...phire.rom.html

Thanks gurusan!! this will come very handy!! I did my own profile with RBE too, but I couldn't fiddle with vgpu settings. I might give this one a try after lowering the core and mem freq. to a more acceptable 680/1075 (these ones I know my card can handle...)

The stock bios is 1.15-1.16 load, my bios is 1.20-1.21v load so you should be able to do much more than 680mhz on 1.2v No harm in being conservative though

[albon]

I have a small problem with RBE: every time I mod a bios and save it, i lose all the voltage settings, they re replaced with ---
For example if I open an official bios file or your bios Gurusan in RBE, i see the voltages, but when I save the file and reopen it all the voltages are gone (---).