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DaHelios
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Radeon HD 3850, and what is your stable overclock limits? - 2008/02/20 22:26 What is the highest clock any of you guys have heard of stable on the Radeon HD 3850? I want to know the limit with the voltages used. I have made my own BIOS and flashed my Sapphire Radeon HD 3850 512MB to 1.22V and 800MHz core and 1900MHz memory clock speed. And it still runs cool under load with many heatsinks and Zalman VF900 full throttle, still silent though.

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Mavke
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/02/20 23:06 Well I only had a PowerColor Radeon HD 3850, actually the Xtreme version with 512MB memory that did 770/1960MHz stable with no tweaks of the voltages, so meaning with the default BIOS coming with the card. Which means simple overclocking via software and that was it.

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DaHelios
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/02/20 23:19 Thank you for the quick response. After a little more tweaking, I got 850MHz core and 1900MHz memory at 1.274V stable but I am seeing if I could push it to 880MHz core and higher memory later but should I upload any of my BIOS's or do you guys not need the ones with a certain cooler required, upgraded cooling?

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Mavke
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/02/20 23:30 Great result mate, and 850MHz is really nice, though indeed the memory might be able to reach maybe a bit higher. All depends a bit what kind memory Sapphire has put on the card, but if it would be 1.0ns then you should be able to reach 2000MHz and maybe higher. Related to the BIOS's you can attach these on this thread for other but you need to clearly state what has changed on them. Although these won't come on our downloads section as that is only for original BIOS to make sure we have the BIOS if an upgrade would go wrong. But on our forums we do share a lot of tweaked BIOS, so please share what you got so far.

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DaHelios
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/02/21 00:05 Thanks for the encouragement on the memory and to bad I cannot tweak memory latency. Please find below my stable BIOS file for a Sapphire RadeonHD 3850 512MB having a Zalman VF900 cooler with Arctic Silver 5 grease.
Sapphire Radeon HD 3850 512MB Tweaked Edition
- Voltage : 1.274V
- Core : 850MHz
- Memory : 2000MHz effective

File Attachment:
File name: Sapp-385-512mb-oc-helios.rom
File size:62464 bytes

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Mavke
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/02/25 23:24 Excellent mate, can you also as a reference to this attach your original BIOS of that Sapphire Radeon HD 3850 512MB graphics card, as that is always good to have a copy of it available.

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cyberlon
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/03/20 11:19 Do you get any black screen when torturing it? I am using FurMark rending benchmark to test and still keep getting black screen while overclocking. I am using an XpertVision Radeon HD 3850 Sonic with 256MB of GDDR3 memory by the way...

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Mavke
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Re:Radeon HD 3850, and what is your stable overclock limits? - 2008/03/20 19:15 cyberlon wrote:
Do you get any black screen when torturing it? I am using FurMark rending benchmark to test and still keep getting black screen while overclocking. I am using an XpertVision Radeon HD 3850 Sonic with 256MB of GDDR3 memory by the way...
Well if you overclock too much and stress the card too much that it indeed something the ATI based cards do, they protect themselves and shutdown leaving only a blank screen. I have seen that with already several cards...

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