700mhz wall on HD4850 is smashed.

[AliG]

1.3v should do it, just give it a go and test it. you might need more than 1.3 or maybe a little under 1.3, no way to find out on your card until you do it yourself.

my card games at 700 with just 1.158v no problem so I'm hoping I can get to 750 with just 1.2v so I don't have to hard mod, but I can always do a pencil mod if necessary

[aldamon]

I tested overcloking 4850 in 3DMark06, voltmod, cooling with Accelero S1
625/2000 (default): 12 745
800/2200: 14 238
800/2400: 14 608
825/2400: 15 375
830/2400: 15 033
840/2450: 15 401
850/2000: 14 057
as seen after 825 MHz for GPU performance has ceased to grow, even more at 830 MHz on the core see failure. I repeated the tests with 825 MHz and 830 MHz - the differences were within the limits of errors
I think in DX10 frequency dependence productivity of GPU / GDDR will be similar

830 is lower than 825? What's going on there? Did you flip the numbers?

[RunawayPrisoner]

my card games at 700 with just 1.158v no problem so I'm hoping I can get to 750 with just 1.2v so I don't have to hard mod, but I can always do a pencil mod if necessary

750 with pencil mod is quite simple. Just draw a line, and you are good to go for several hours:

[jason4207]

I tested overcloking 4850 in 3DMark06, voltmod, cooling with Accelero S1
625/2000 (default): 12 745
800/2200: 14 238
800/2400: 14 608
825/2400: 15 375
830/2400: 15 033
840/2450: 15 401
850/2000: 14 057
as seen after 825 MHz for GPU performance has ceased to grow, even more at 830 MHz on the core see failure. I repeated the tests with 825 MHz and 830 MHz - the differences were within the limits of errors
I think in DX10 frequency dependence productivity of GPU / GDDR will be similar

830 is lower than 825? What's going on there? Did you flip the numbers?

Try using Vantage 'H' or 'X' or maybe Crysis at 1680x1050 or 1920x1200. '06 runs at such a low rez that it's hard to tell where the bottleneck is.

[zbomb5610]

my card games at 700 with just 1.158v no problem so I'm hoping I can get to 750 with just 1.2v so I don't have to hard mod, but I can always do a pencil mod if necessary

i was able to do 750/1150 w/o any voltage mods, try it out and see if it works.

[alioth]

hi allll
finally i have the 4850
i want to know how much can i clock the card in relax..in daily! with this system:

e6420 up to 3.2 ghz
xigmatek s1283
asus p5q-pro
vga, you know
accelero s1 with 2 92mm(more or less 30-40 cfm each)
case: antec nine hundred with 3 120 on the front

a little up

[RunawayPrisoner]

a little up

700/1100, or 700/1150 if you are lucky. If you are not lucky enough, 700/1050.

Depends on your card.

[TsvetanVR]

Hey!Can someone give me a modded bios because I don't want to take the risk of modding a bios on my own? Thanks.
My card is a Sapphire 4850 and gets to 680 core 2300 mem out of the box (watercooled). Anything above 680 causes Fur Benchmark to freeze in 2-3 seconds.. so I guess I need more voltage..

[RunawayPrisoner]

Hey!Can someone give me a modded bios because I don't want to take the risk of modding a bios on my own? Thanks.
My card is a Sapphire 4850 and gets to 680 core 2300 mem out of the box (watercooled). Anything above 680 causes Fur Benchmark to freeze in 2-3 seconds.. so I guess I need more voltage..

Take a pencil and draw some lines, then see if you can get 700MHz stable or not. Designate your overclocking goal.
I can give you my own BIOS (which gives 150/500 idle and 750/1100 load) but it's from a Powercolor card, and I have no idea what kind of effect it may have on a Sapphire card. Just take your own BIOS out, and modify it. It's safer that way.

[TsvetanVR]

What type of pencil should I use for the mod? Can you give me a screenie with the points I need to connect with the pencil?

[zbomb5610]

900/1225 seems pretty stable so far, 1.41v load gpu, 2.07v memory. using msi bios on my visiontek.

it is weird though cause i was able to do 14200 on 3dmark06 w/ my ide 120gb hard drive w/ fresh install of windows w/ speeds at 855/1150.

i can only do 13980 w/ my card at 900/1225 w/ my 640gb raid setup using 7200.10. i wonder if i have some other app open that is hindering my score.

[AliG]

900/1225 seems pretty stable so far, 1.41v load gpu, 2.07v memory. using msi bios on my visiontek.

it is weird though cause i was able to do 14200 on 3dmark06 w/ my ide 120gb hard drive w/ fresh install of windows w/ speeds at 855/1150.

i can only do 13980 w/ my card at 900/1225 w/ my 640gb raid setup using 7200.10. i wonder if i have some other app open that is hindering my score.

Just wondering, what does your 640gb hdd show up as in windows, mine only shows up as 596 If anything that should be an advertised 600gb, losing 44gb is rediculous

i was able to do 750/1150 w/o any voltage mods, try it out and see if it works.

That was without any vmods, I just told ccc to auto tune, and took me to 700/1100, I could have gone higher on the memory but I actually clocked it down since I have no need for that high speed memory, and don't want to risk killing it.

[alioth]

700/1100, or 700/1150 if you are lucky. If you are not lucky enough, 700/1050.

Depends on your card.

mmm also if i change volt with a program? (when it will be right) or with a pencil mod?
can i have the card stable in daily?

[zbomb5610]

Just wondering, what does your 640gb hdd show up as in windows, mine only shows up as 596 If anything that should be an advertised 600gb, losing 44gb is rediculous



That was without any vmods, I just told ccc to auto tune, and took me to 700/1100, I could have gone higher on the memory but I actually clocked it down since I have no need for that high speed memory, and don't want to risk killing it.

mine shows up as 596 as well, you always lose hard drive space, you never get what is advertised.

the auto tune feature maxes out at 700 though doesn't it, try to change that value in the bios and try out 720-750 and see if you can get stable somewhere in there.

[RunawayPrisoner]

mmm also if i change volt with a program? (when it will be right) or with a pencil mod?
can i have the card stable in daily?

Use the pencil method to give the overclock some headroom.
And yes, you can have the card stable daily. I test my overclocks for at least an hour before I conclude that they are stable.

[AliG]

mine shows up as 596 as well, you always lose hard drive space, you never get what is advertised.

the auto tune feature maxes out at 700 though doesn't it, try to change that value in the bios and try out 720-750 and see if you can get stable somewhere in there.

I'm sure even with just 1.2v I could get to 750, I'm just debating whether or not I actually need the extra boost before I spend the $26 on an aftermarket cooler

[RunawayPrisoner]

If you are gaming at 1280 x 1024, or you are satisfied with Crysis, then you don't need to spend more. If you want more score on... say... 3DMark Vantage, do spend more. It's only $26 extra to get close to, or if you are lucky, above 4870 performance.

[binormalkilla]

Well I have two of these bad boys arriving early next week so hopefully I'll have them well over 700 MHz....I'll have my MCW60 blocks on them as well. I have a LOT of copper BGA RAMsinks to go on the memory and PCB components too.

[Devious]

I tested overcloking 4850 in 3DMark06, voltmod, cooling with Accelero S1
625/2000 (default): 12 745
800/2200: 14 238
800/2400: 14 608
825/2400: 15 375
830/2400: 15 033
840/2450: 15 401
850/2000: 14 057
as seen after 825 MHz for GPU performance has ceased to grow, even more at 830 MHz on the core see failure. I repeated the tests with 825 MHz and 830 MHz - the differences were within the limits of errors
I think in DX10 frequency dependence productivity of GPU / GDDR will be similar

Same trend here with my xfire 4850's

Did some testing with these cards last night on 3D mark 06 , i ran the tests a few times with my cpu @ 3.8Ghz and as i clocked the cards over a certain point the scores started to get worse


Q6600@3.8Ghz

750/1050 = 20229
800/1075 = 21328*
825/1100 = 21199
850/1080 = 21103


Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.

I need to try it in some other games/test.

[jimmyz]

Same trend here with my xfire 4850's

Did some testing with these cards last night on 3D mark 06 , i ran the tests a few times with my cpu @ 3.8Ghz and as i clocked the cards over a certain point the scores started to get worse


Q6600@3.8Ghz

750/1050 = 20229
800/1075 = 21328*
825/1100 = 21199
850/1080 = 21103


Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.

I need to try it in some other games/test.

It's not that unusual, ATI relaxes the ram timings as you clock it higher, also you might note the cards ram needs to clock up in 25mhz jumps. They sync at intervals of 25 so keep the freqs divisable by that number.

The core is also affected by the same problem, this has been true since the 1900's AFAIK. find out where it performs best ( the factory setting is a clue.) then stick to the ratio. I would tell the number but I am going for some cups this weekend and I need all the tweaks I can to get past Gomeler.

[Factotum]

Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.

I think this is CPU-wall
See for CPU loading during the testing: I have a core fully loaded after GPU=825MHz , and the second core why it is used at 2-7%
It's my testing:

[chri5g]

Same trend here with my xfire 4850's

Did some testing with these cards last night on 3D mark 06 , i ran the tests a few times with my cpu @ 3.8Ghz and as i clocked the cards over a certain point the scores started to get worse


Q6600@3.8Ghz

750/1050 = 20229
800/1075 = 21328*
825/1100 = 21199
850/1080 = 21103


Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.

I need to try it in some other games/test.

Do you play 3D marks or games??Check in games and you`ll see more FPS

[Devious]

Do you play 3D marks or games??Check in games and you`ll see more FPS

Thanks for your input.

[Factotum]

Thanks for your input.

[ghost101]

I have also experienced the problem mentioned but Ive been using 3dmark vantage to check. This happens exactly around 800-850mhz. I havent got any higher. Also, the memory clock speed seems to have a large effect at this point.