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Overclocking HD 6850. Help needed.

post #1 of 8
Thread Starter 
So I decided to overclock my Sapphire HD 6850 recently and I've been using Sapphire Trixx to do it. I'm sticking with stock voltages for the time being.

My CPU Clock is maxing out at about 890Mhz, beyond which artifacts start appearing in TechPowerUp's GPUTool. On the other hand, my memory clock is currently beyond 1200 without a single artifact appearing.

Temps at 890/1200 are maxing out at 74 degress with the fan speed stable at 63%.

My questions are:
A)Are those temperatures and fan speeds okay?
B) Is it normal for the memory clock to exceed what most other 6850 owners are achieving at stock voltages, while the core clock is lagging behind?
C)Is it alright to keep the memory clock so high?
D)And what other stress test should I be using?
post #2 of 8
A) If it's 74C load then that's fine, if it's idle then that's too high.

B) All cards are different, yours might just have great memory. Mine maxes around 1100. I would do some benching to make sure it's increasing performance. Sometimes high memory clocks can actually have a negative impact on performance if they are too close to their limits.

C) Yes, as long as it's not hurting performance or causing artifacts.

D) I use FurMark to stress test my GPUs. It stresses beyond what any real world game would so it should ensure stability.
Edited by Ben the OCer - 8/15/11 at 11:10am
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Ben the OCer View Post
A) If it's 74C load then that's fine, if it's idle then that's too high.

B) All cards are different, yours might just have great memory. I would do some benching to make sure it's increasing performance. Sometimes high memory clocks can actually have a negative impact on performance if they are too close to their limits.

C) Yes, as long as it's not hurting performance or causing artifacts.

D) I use FurMark to stress test my GPUs. It stresses beyond what any real world game would so it should ensure stability.
Yeah, those are load temps, glad to hear those are fine. I just thought it was surprising that the memory clock could go so high beyond stock.

Thanks for the help.
post #4 of 8
Quote:
Originally Posted by jalebi View Post
Yeah, those are load temps, glad to hear those are fine. I just thought it was surprising that the memory clock could go so high beyond stock.

Thanks for the help.
GPUs are designed to take much higher temperatures than most other components. While that temperature might sound high compared to your CPU, it's perfectly normal for a GPU. Some of the high end GPUs even get into the 90C range load.

Again, overclocking just depends on the card you get. I had an MSI HD6850 that overclocked a little better than my Asus and it could do 1175 with the memory. It's my pleasure, glad I could help. Welcome to OCN by the way!
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Ben the OCer View Post
GPUs are designed to take much higher temperatures than most other components. While that temperature might sound high compared to your CPU, it's perfectly normal for a GPU. Some of the high end GPUs even get into the 90C range load.

Again, overclocking just depends on the card you get. I had an MSI HD6850 that overclocked a little better than my Asus and it could do 1175 with the memory. It's my pleasure, glad I could help. Welcome to OCN by the way!
Thanks for the welcome.

I just have one last question, what settings should I run Furmark on? Is the default resolution of 1280x720 with the default "Dynamic Background" and "Burn-in" options checked good? I'd assume the "BURN-IN Test" would be the correct one for a stress test, right?
post #6 of 8
Quote:
Originally Posted by jalebi View Post
Thanks for the welcome.

I just have one last question, what settings should I run Furmark on? Is the default resolution of 1280x720 with the default "Dynamic Background" and "Burn-in" options checked good? I'd assume the "BURN-IN Test" would be the correct one for a stress test, right?
The default settings that you mentioned should be fine. All raising the resolution would do is lower the frame rates but it wouldn't load the GPU anymore since it's already at around 100% with 1280x720. You can play with it a little if you want but again it shouldn't make much difference. The thing with FurMark is that it doesn't automatically check for artifacts. You will have to check that yourself and get mesmerized by the donut.
Edited by Ben the OCer - 8/15/11 at 12:05pm
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post #7 of 8
Thread Starter 
Performed Furmark tests at default values and also at my native res (1920x1080) with xtreme Burn In and Post Fx on, as recommended by a tutorial. Ran it for 15 minutes without artifacts both times, so I guess I'm in the clear. Seems to work above 1200Mhz Memory clock, but I think I'll stick with 1200 for the time being. Cheers!
post #8 of 8
Thread Starter 
After running some benchmarks on 3D Mark 11 I got a graphics 3680 at 890/1175 and a score of 3687 at 890/1200. Is it worth it keeping it OC'd to those levels despite the minimal gain? or is it better for the hardware to keep it at the lower levels?
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