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ATI 4850 Overclock Results

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I feel that much better:shadedshu I guess this it how Visiontek wanted it.
Not all VisionTek's are bad....Mine clocks great!...But the mem sucks:banghead:

690 on stock voltage is normal, have you tried the 1.2v bios flash...if you have, then you just got a poor clocker, no cards overclock the same.
 

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One more question. What's the maximum safe voltage for core and memory? My card is cooled with AC Accelero S1 heatsink and AC AF12025 fan.
 
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One more question. What's the maximum safe voltage for core and memory? My card is cooled with AC Accelero S1 heatsink and AC AF12025 fan.
I would just do 1.25-1.3v...You don't really need anymore, unless you want 800+MHz. I'm not sure about the memory thou, but these cards love high memory clocks.

Edit: I see your at 850MHz...I would say 1.4-1.45v....maybe 1.5 would be safe, but make sure your temps are good, especially temp#2.
 
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I'm at 650x1100 (temps below 60C@peak) on 4850/512MB, CCC said 690x1125 was OK but I don't want to push things too much right now.
Incidentally, I use the accelero on it and when I felt the ram heatsinks after running a bench I noticed those were VERY hot, so don't skimp on RAM heatsinks people, and in my view it would be silly to OC the GPU with voltmods to extremes and yet have the RAM only mildy OC'ed like some people here.
From what I've read the GPU can only do so much if it can't access the RAM fast enough, although I didn't read any specific benches, perhaps I should try to underclock RAM and run a bench then reset the RAM and underclock the GPU and run a test and see what the importance is, although the question then is what would I use to test, something that has a perfect combination of GPU and texture and yet is realistic and not too much of an only-happens-in-benchmark scenario.

I wonder if the stock cooler is actually heating the GPU up via that RAM, it would not surprise me :)
 
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Here's a test of underclocking the RAM of the 4870 compared to underclocking the GPU and compared to the 4850 at normal speeds, it's in german but the graphs are obvious:

http://www.computerbase.de/artikel/hardware/grafikkarten/2008/bericht_was_gddr5_radeon_hd_4870/3/

Might be interesting for people to see what matters, their conclusion is that RAM is most intensively used when using 8xAA or more and so we can conclude that if you do a lot of AA oc'ing RAM is more important than if you don't.

If you want to read it in other languages try http://translate.google.com or http://babelfish.yahoo.com/ and such.
 
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Here's a test of underclocking the RAM of the 4870 compared to underclocking the GPU and compared to the 4850 at normal speeds, it's in german but the graphs are obvious:

http://www.computerbase.de/artikel/hardware/grafikkarten/2008/bericht_was_gddr5_radeon_hd_4870/3/
That test is rubbish, IMO. Why did they underclock HD4870 rather than overclocking the HD4850? You can't see the memory bandwith advantages if you lower the core clock. That's common sense. @ 750 it would have been a fair test, but now it's just useless. :shadedshu
 
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The test was to see the effects/advantages/cost-effectiveness of DDR5, to see that they underclocked the RAM (admitting that it of course could then in reality run at better timings) to see what benefits the high speed of RAM brings.
I see nothing wrong with the test and the word rubbish seems inappropriate just because a test doesn't equal exactly how you would do it 1:1 just because you have other interests.

But to each his own.

My impressions of GDDR5 is that it's like DDR3 for motherboards, you need a system/CPU (and software) that's geared to it to get the real benefits and for normal setups it brings some advantages but not the full potential theiretically possible.
 
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The test was to see the effects/advantages/cost-effectiveness of DDR5, to see that they underclocked the RAM (admitting that it of course could then in reality run at better timings) to see what benefits the high speed of RAM brings.
I see nothing wrong with the test and the word rubbish seems inappropriate just because a test doesn't equal exactly how you would do it 1:1 just because you have other interests.

But to each his own.
I have to agree. The clock speed isn't all that important just to see the difference in memory performance. Besides the 4850 cores are the same as 4870 cores that can't run as fast so overclocking the 4850 core isn't always an option... But it is interesting results. I am sure as newer games comes out the bandwidth advantage of GDDR5 will be more apparent.
 
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Well I'm going to test for higher memory clocks soon....I'm stable at 1125 so far....I ran vantage last night at 1200 and it was stable, but the score was lower..........I may have forgot to turn off my forced 16X AF though.


Has anyone found an app to monitor the vGPU yet?
 
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Has anyone tried any voltmods for the memory? I have a 4850 with the memory stable at 1125. I can run 3dmark06 and CoD4 fine with my memory clocked at 1175, but I artifact in atitool after 2-3 minutes.

The stock voltage for the memory was about 2.04V I pencil mod the voltage up to 2.15V, but it didnt help increase the clocks (only increased the temperatures).

I wonder if a reverse memory vmod exists for the 4850. I remember reading that lowering the memory voltage on some of the 8800s actually helped it clock higher.
 

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Yes, I think reverse memory pencil mod exists for the HD4850. If it's the same as the one for HD3850, you should pencil R711 instead of R710. But you have to do this on your own risk, because I've never checked, if it works.
 
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Has anyone tried any voltmods for the memory? I have a 4850 with the memory stable at 1125. I can run 3dmark06 and CoD4 fine with my memory clocked at 1175, but I artifact in atitool after 2-3 minutes.

The stock voltage for the memory was about 2.04V I pencil mod the voltage up to 2.15V, but it didnt help increase the clocks (only increased the temperatures).

I wonder if a reverse memory vmod exists for the 4850. I remember reading that lowering the memory voltage on some of the 8800s actually helped it clock higher.
There are several people who have tried it here:
http://www.xtremesystems.org/forums/showthread.php?t=190990&page=23
I can run Vantage at 1200 also but I get artifacts......not bad ones, but they exist nonetheless.
 

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Has anyone tried any voltmods for the memory?
I did the 100K ohm memory voltmod and all I saw was unstable overclocks. I am currently running 1100 mhz mem speed without the 100K ohm mod - so far it looks stable.

My GPU is up to 800 mhz with maximum temps around 84C (using Furmark - this is the best). I think one of the main things limiting my mem overclock is that the aftermarket cooler I have (Zalman GV1000) blows hot gpu air on my memsinks not allowing them to cool properly. Here are some pics.
 

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Beautiful man:p...Good work.
 
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I did the 100K ohm memory voltmod and all I saw was unstable overclocks. I am currently running 1100 mhz mem speed without the 100K ohm mod - so far it looks stable.

My GPU is up to 800 mhz with maximum temps around 84C (using Furmark - this is the best). I think one of the main things limiting my mem overclock is that the aftermarket cooler I have (Zalman GV1000) blows hot gpu air on my memsinks not allowing them to cool properly. Here are some pics.
Why is there a small black heatsink on the top of the card? Is it a component that becomes very hot?
 
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That DDR3 is just rated to run at 1000, anything over that is lucky but I don't think voltage alone is going to bring that much, perhaps if you can change the timings in the BIOS of the various RAM setting like CAS and such you might get a higher clock, but then you'd have worse timings, it's just running into physical impossibilities probably I think.
It would be interesting to have access to the timings though because perhaps you could run it at a lower-than-max speed and set tighter timings and get some improvements in games/benchmarks, perhaps it even actually has more room for improvement in timings than in raw speed.
 
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Why is there a small black heatsink on the top of the card? Is it a component that becomes very hot?
To the touch I noticed it was extremely hot and I had also read on another thread somewhere that someone had stability issues with overclocking memory due to temp issues with this chip. After reading your question I measured the temperature of the chip on one of the sink fins and it was 60°C, so at the chip it will be even hotter.

I am sure the sink helps with chip life and maybe stability to some degree, but I have not been able to quantify the improvement; especially with all the other mods I made - and there are more to come as well...
 
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I did the 100K ohm memory voltmod and all I saw was unstable overclocks. I am currently running 1100 mhz mem speed without the 100K ohm mod - so far it looks stable.

My GPU is up to 800 mhz with maximum temps around 84C (using Furmark - this is the best). I think one of the main things limiting my mem overclock is that the aftermarket cooler I have (Zalman GV1000) blows hot gpu air on my memsinks not allowing them to cool properly. Here are some pics.
84C :twitch: you might wanna put a stronger fan on that thing.
w/my thermalright v2 +80mm fan I was hitting 58C at 850/1150 ;)
 

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84C :twitch: you might wanna put a stronger fan on that thing.
w/my thermalright v2 +80mm fan I was hitting 58C at 850/1150 ;)
I just ordered two 80mm fans to replace the stock fan. What were you running when you were at 58C? Under normal game play my worst temp using GPUz is about 60C. It is only when I use Furmark stability test do my temps get up to the 80s.
 
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ohh I hit 64C with furry
 
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hello all i got Gigabyte 4850 modded bios to 810/1185 did pencil mods and voltagies are 1.28 for gpu and 2.08 for memory at full load.. playing games all stable so far,,, didnt try past 810 yet..but memory started showing artifacts at 1200 in command and conquer 3 Kanes's wrath.
 
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hey Chezz very nice setup... i got very similar one ,,except zalman vf1000,,thats identical to urs, and 80mm fan blowing on those VRM chips and zalman heatsink ..this card is so great
 

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I did the 100K ohm memory voltmod and all I saw was unstable overclocks. I am currently running 1100 mhz mem speed without the 100K ohm mod - so far it looks stable.

My GPU is up to 800 mhz with maximum temps around 84C (using Furmark - this is the best). I think one of the main things limiting my mem overclock is that the aftermarket cooler I have (Zalman GV1000) blows hot gpu air on my memsinks not allowing them to cool properly. Here are some pics.

Hi Chezz,

Sorry to bother you but I am intrigued by the pictures of your 4850 here



I was wondering those connectors are that you soldered on. I'm new to the whole OC scene, but it looks like you soldered the large molex connector on to the board so you can easily check the vmem and vgpu?

The yellow wire is for VMEM and the red is VGPU? Do you have a third wire soldered somewhere else?

lol, I saw your post a few days ago and just now realized that (I think) that is what that is.

What are the two white connectors for. And same with the blue cap things?? Are those resistors or something?
Is the left white connector (one next to black heatsink) for the memory voltage mod? What is the right white connector?
 
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No problem, I posted to share with others. The modifications you see here are both the memory and the GPU voltmods and you can find more details on wiring here: http://www.techpowerup.com/articles/overclocking/151. The blue components are 100 Ohm variable resistors that are ran in parallel with select components. The left resistor is used to adjust mem voltage and the other is used for GPU voltage. The white 4-pin molex is used to measure the voltages - it is great for connecting a multimeter. The yellow wire is mem volts and the red is GPU. The blue variable resistors are pushed into standard three pin fan plugs; this allows me to easily remove the resistors - thus remove the overclock whenever I want to. Here is a link were I got the setup: http://www.xtremesystems.org/FORUMS/showthread.php?t=190990&page=6 (Jason really deserves the credit).

To simplify solding I wired my card in slightly different locations then some other people. I used a multimeter to check for continuity to other solder locations.

With this mod I can easily go above 1.5 volts on the GPU and over 2.2 volts (not recommended) on the mem. I actually am thinking of going to a 150 or 200 ohm resistor on the mem because I can not go below 2.1 volts on the mem with the 100 ohm. I will post some more pictures shortly.
 
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hey Chezz very nice setup... i got very similar one ,,except zalman vf1000,,thats identical to urs, and 80mm fan blowing on those VRM chips and zalman heatsink ..this card is so great
Thanks, how high have you gotten your clocks? How did you mount the 80mm over the VRM? I measured my VRM temps with the fan I have now and the temp on the heatsink was about 70C; a little high in my opinion. However, this was while running Furmark, which is a little overkill. I was debating whether I should get a new fan on the VRM. I only have ten fans in my computer, so what's another large fan...
 
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