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post #21 of 36
You need to run NB clock around 2800 @ 1.30v - 1.35v to make a big impact on your memory speed.

HT Link should stay around 2000 +/- 100MHz unless you run some serious SLI/Crossfire on your PCIe lanes like Tri or Quad 470+ or 570+. HT Link is what communicates with the PCI lanes.

Your CPU is the same as mine with exception to mine is supposed to have a faulty core. I was able to run 2800 at 1.3125v at 4.2GHz. Yours should be fairly close if not slightly lower depending on your temps. What temps does it get up to at your 4.0 clock? I want to remind you to keep an eye on the temps one more time. I am under water, so I can run 3000MHz and 1.375v and stay under 40C.

Quote:
Originally Posted by amdcpu4life View Post
Changing it back to 2000Mhz. Actually getting constant 20 fps all very high 2xaa @ 1400x900.

Before it was 30-40 fps...

Weird.
You cannot just set it to 2400 or whatever clock and not stability test it. I bet it needs more voltage. If I set my voltage to 1.35v instead of 1.375v, I do not crash in Crysis 2 or benchmarking, but my gflops go from 56 down to 41 and my FPS takes a hit. I use Linx when I test for NB stability because it shows the gflops and I know when they go down like that it is not a 100% stable clock.
Edited by BWG - 7/16/11 at 8:51pm
 
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post #22 of 36
What Impotantly NB and HT Link clock and Voltage?

exam my CPU is X4 945 is x15 Multiplier

I set up FSB 280 are 4200Mhz, when NB clock 2800 and 1.35v... HT link speed is 1200Mhz. and DRAM get 3 option menu are 1120-1492 and 1820. I use GSKILL 2x2G PC1333 [10666] timming is 9-9-9-24.

successfully boot and into windows, use Linx application stresses the CPU and RAM, a few minutes got bluescreen. Anything wrong

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post #23 of 36
Yep must say I got a huge performance increase too when overclocking my NB to 2668mhz..didn't see any performance gain raising it any higher. On average, most games increased by about 20fps.

I can get 3017mhz on my NB @ 1.35v but performance doesnt seem much different so i have put it back down to 2668mhz @ 1.27v for now...unless anyone can give me a reason to keep it at 3017mhz! Not sure if its worth the added stress by adding more voltage
Edited by Darylrese - 7/17/11 at 4:06am
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post #24 of 36
You need faster ram to complement the faster NB.

At least thats what I believe the charts I saw stated.

I dunno how valid that is though, for instance the same ram with equal speed/timings on sandy run quite a bit faster than on Phenom II no matter what the NB is at. I think there are some other things that are affected, such as L3 which play a role in the effectiveness of a northbirdge.
    
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post #25 of 36
Quote:
Originally Posted by AccellGarage View Post
What Impotantly NB and HT Link clock and Voltage?

exam my CPU is X4 945 is x15 Multiplier

I set up FSB 280 are 4200Mhz, when NB clock 2800 and 1.35v... HT link speed is 1200Mhz. and DRAM get 3 option menu are 1120-1492 and 1820. I use GSKILL 2x2G PC1333 [10666] timming is 9-9-9-24.

successfully boot and into windows, use Linx application stresses the CPU and RAM, a few minutes got bluescreen. Anything wrong

I think your HT link is too slow. You need it at 2000 +/- 100MHz so 1900 to 2100 is optimal. Since you have it set so low, I think your PCI cards might be bottlenecking and causing the blue screen. What error doe the BSOD have?

Quote:
Originally Posted by Darylrese View Post
Yep must say I got a huge performance increase too when overclocking my NB to 2668mhz..didn't see any performance gain raising it any higher. On average, most games increased by about 20fps.

I can get 3017mhz on my NB @ 1.35v but performance doesnt seem much different so i have put it back down to 2668mhz @ 1.27v for now...unless anyone can give me a reason to keep it at 3017mhz! Not sure if its worth the added stress by adding more voltage
See below, if you set your memory controller too high it will try and communicate too fast with the memory which degrades performance. In other words, the memory cannot keep up with the NB requesting data.

Quote:
Originally Posted by BallaTheFeared View Post
You need faster ram to complement the faster NB.

At least thats what I believe the charts I saw stated.

I dunno how valid that is though, for instance the same ram with equal speed/timings on sandy run quite a bit faster than on Phenom II no matter what the NB is at. I think there are some other things that are affected, such as L3 which play a role in the effectiveness of a northbirdge.
It's you again! Dang intel people always coming in and spoiling AMD's fun. Intel smokes AMD all around. We had a memory maddness contest a few months back and someone had a SB rig with my memory in it and was getting 6MB/s more bandwith and 8ns lower latency at lower clock speeds and higher timings.

In summary, you gotta test each NB clock speed and the easiest way to do this is by using Sandra Pro and running bandwith and latency tests at each clock. You must be sure to stability test, perferably with Linx first though. Like I said earlier, undervolting the NB may cause perfermormance to deteriorate and Linx will show it with the gflops calculations. 1333 should be optimal at 2600-2800 depending on your timings. Also, AMD has been shown to have better efficiency at lower timings rather than higher clocks. People have increased bandwith and decreased latency by downclocking, overvolting, and reducing timings; something that does not hold true on intel setups. It takes a lot of work to get everything optimized and shortcutting like OP did is not the way to handle a nb oc.

Also, at my sig clocks I tested 2870 and 3070. Due to not getting any lower timings, I increased my speed. At those timings and clocks I increased my bandwith by .6MBs and my latency decreased by 2.1ns. That kind of result may be similar on 1333 chips at 2600 vs 2800 but you have to test it properly.
 
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post #26 of 36
Your computer is only as fast as it's slowest component. That's why i opted to raise my memory to 1838mhz cl8 over the tighter 1600mhz cl6. I noticed that if i raise my NB past 3000mhz and increase the speed of my memory, it would actually improve overall performance, more than if i just raised the NB alone. When you overclock you really have to overclock everything if you want it to work well together.
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post #27 of 36
I leave NB settings on Auto, it is supposed to clock automatically depending on bandwidth required, isn't it ?
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post #28 of 36
Quote:
Originally Posted by adridu59 View Post
I leave NB settings on Auto, it is supposed to clock automatically depending on bandwidth required, isn't it ?
Auto is "stock".
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post #29 of 36
Quote:
Originally Posted by adridu59 View Post
I leave NB settings on Auto, it is supposed to clock automatically depending on bandwidth required, isn't it ?
Nope. If you would like for me to make a new step by step post for you to follow, I will. It should be worth doing, but if you are happy with the gameplay as-is then why bother.
 
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post #30 of 36
Quote:
Originally Posted by BWG View Post
Nope. If you would like for me to make a new step by step post for you to follow, I will. It should be worth doing, but if you are happy with the gameplay as-is then why bother.
You should definatly manually configure your NB settings when overclocking. Big performance gain by doing so. Auto is just stock i believe as someone has already said above!

My memory is pretty standard 1333mhz G.SKILL CL9 so it doesnt overclock much atall...only by a few mhz with the fsb increase. Anything more and it just crashes or won't post. I should invest in some new memory I guess...
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