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X2 5600+ Need a little help from you OC gurus - Page 3

post #21 of 26
Quote:
Originally Posted by stomy View Post

No stability test?
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post #22 of 26
Quote:
Originally Posted by dralb View Post
No stability test?
Agree, and 1.6v is crazy just to get 3.4... Load temps must be toasty
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post #23 of 26
In bios it may say HT link, Hyper Transport link or something similar. Stock it should be at x5, you can lower it to x4 or x3 if your bios allow
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post #24 of 26
Quote:
Originally Posted by Schlup View Post
And what exactly will that do? Also, where do I overclock my RAM and where can I find info on what settings to use?
The HT has a max speed of about 1100 on 939s and 1400 on AM2, when its exceeded instability will follow.


You don't OC the RAM per say, you actually under clock it so it has room to increase with the CPU OC. That wouuld be to set DDR400 to DDR333 or DDR266 if necessary, also known as using a "divider.''
    
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post #25 of 26
Hi,

I read through this thread and there are a few points to make;

1. Hyper thread speed is less important than almost any other parameter. AM2s will run fine with the hyperthread under 800 MHz. The idea that you need to try to run hyperthread above 1100 MHz is not correct and it makes a lot of people give up on OCing AMD X2s.

2. Some, not all, AM2 motherboards do not work well with the 4X hyperthread multiplier. My MSI K9N SLI Platinum is one example of these boards.

3. Windsor core CPUs have trouble going more than 3 GHz. If you use air cooling, then you need the best like a Tuniq tower 120 or equivalent. The AMD stock air cooler is garbage - barely keeps the CPU cool at stock settings.

4. AMD X2 CPUs have more memory bandwidth and less processor bandwidth than intel core duos. Overclocking AMD X2s is about speeding up the CPU even if it means reducing the memory speed.

5. Memory speed in MHz is not a direct measure of memory bandwidth. The AMD memory controller in X2 CPUs is the bottleneck. The faster the CPU speed, the more memory bandwidth you will get.

6. Windsor core AMD X2s can take a lot of Vcore. I have run mine at 1.75 volts under Prime95 for hours. Temps were under 63 degrees C. And, my CPU still works great.

That is it for now. I'll post more later.

My 5600+ is running 3.2 GHz with 24 hour Prime95 stability.

Thanks!
post #26 of 26
So my last post listed some "lessons learned" while working with the AMD X2 5600+. Here is how I have applied these lessons:

1. Don't worry about Vcore being under some arbitrary number. The Windsor core needs voltage to get past 3.1 GHz. Mine seems to work best at 1.65 volts. That is a lot more than most people think you can use.

2. Set the hyperthread multiplier at 3X and leave it there.

3. Turn off every kind of spread spectrum in your bios - all of it!

4. Keep the RAM running around DDR800 speed (370 to 420 MHz).

5. Try to run the RAM command rate at 1T rather than 2T.

6. Use a quality power supply. I am having great luck with a Corsair 450W even with two 7600GTs in SLI and my Vcore at 1.75 volts.

7. Expect the temperatures to be on the high side for OC'd Windsors under long duration load. Many think that 50 degrees C is some magic barrier. It isn't. If you are not going to run the CPU at max load 24/7 then it is OK to see temps nearer to 60 degrees C after several hours of stress testing.

8. Be 100% certain that the RAM is not at its limit for MHz. AMD X2s are not limited by memory bandwidth. Memory errors are not worth the risk -> will eventually screw up the operating system and/or your precious files. Find the maximum speed of your ram and stay well below it.

9. Don't be afraid of "cooking" your CPU. It will become so unstable that it won't even boot up long before you push it hard enough to damage it. Further, you are probably going to upgrade your system long before your CPU "ages" enough to looses measureable OCing capabilities.

10. Test relentlessly for stability. Just running 1 hour of Prime95 is not enough to be sure the system is stable. You need to see at least 24 hour Prime95 stable to be sure your OC will be OK long-term.


I have an overclocked socket 754 system (Athlon64 venice core) that has been running close to 24/7 for over a year. It has shown no signs of degredation from being OC'd all that time. The overclock on that machine was worth the effort. Stock SuperPI 1M was 41 seconds. Overclocked it now does 1M in 32 seconds.

With my Athlon X2 5600+ OC'd from 2.8 GHz to 3.2 GHz, SuperPI 1M dropped from 31 seconds to a bit over 26 seconds. That is a substantial improvement indeed.

Last thing: With my Venice core CPU there was some break-in effect. The more time it ran at high voltage and MHz the easier it was to run it faster. I think I am noticing the same with my 5600+ Windsor. Over the first 3-4 weeks it seemed to "loosen up" and accept more aggressive settings before becoming unstable.

Good luck!
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