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Overclocking Phenom II 945 question - Page 2

post #11 of 25
You may not be able to raise the multiplier of the CPU, but you CAN lower it. I found that lowering my multiplier between 1-2x and raising the FSB much higher resulted in a higher, stabler overclock. I'm currently running mine with 14x multiplier @ 275 FSB and 1.500v

Every chip is different, but you should definitely be able to get to at least 3.6-3.7
    
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post #12 of 25
I just love it how people say "you should havegotten the Black Edition it's way faster!" when in fact it just has an unlocked multiplier for overclocking. You can overclock a non black edition to the same speeds as long as know what your doing.

I have the C3 945 which overclocks to 3.6 on stock voltage and considering I saved alotof money over the 955 I have no regrets for getting the 945.
post #13 of 25
Quote:
Originally Posted by B-roca View Post
I just love it how people say "you should havegotten the Black Edition it's way faster!" when in fact it just has an unlocked multiplier for overclocking. You can overclock a non black edition to the same speeds as long as know what your doing.

I have the C3 945 which overclocks to 3.6 on stock voltage and considering I saved alotof money over the 955 I have no regrets for getting the 945.
Actually, the higher numbered CPU's (955,965, etc.) are taken from a higher-quality part of the wafer which the CPU's are made from. Therefore, technically, it is a higher quality chip. Throw in the unlocked multiplier, and it is superior.

Keep in mind that every motherboard is different. Some motherboards cannot push the FSB as high as others, which is where the unlocked multiplier really comes into play.
    
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post #14 of 25
Thread Starter 
I see...

So at this point, this is what I tried yesterday night and it crashed after 15 minutes of gaming (sorry, too lazy to test using Prime95):
1. Reference clock = 225x15 = 3375
2. HT = 225x9 = 2025
3. CPU Voltage = 1.4V


I haven't changed the RAM settings yet. Where do I change it on the AMD Overdrive? Which setting to tweak? If I'm not mistaken, my RAM defaults to 9-9-9-24@1600, so what should I change it to? Any guidance with screenshots of AMD OverDrive is very appreciated.
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post #15 of 25
Quote:
Originally Posted by sakai4eva View Post
I see...

So at this point, this is what I tried yesterday night and it crashed after 15 minutes of gaming (sorry, too lazy to test using Prime95):
1. Reference clock = 225x15 = 3375
2. HT = 225x9 = 2025
3. CPU Voltage = 1.4V


I haven't changed the RAM settings yet. Where do I change it on the AMD Overdrive? Which setting to tweak? If I'm not mistaken, my RAM defaults to 9-9-9-24@1600, so what should I change it to? Any guidance with screenshots of AMD OverDrive is very appreciated.
You do NOT change your RAM settings via Overdrive. You actually should not be using Overdrive for anything; use your BIOS.

Also, if you are too lazy to stress test with Prime, then you shouldn't overclock.
    
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post #16 of 25
I highly doubt you need more voltage. Just upping my multiplier to get 3.3Ghz didn't require changing ANYTHING to be 100% stable, but trying to go past 3.3 required tiny increases in voltage. I'll open a window, OC to that again, and post my BIOS settings later and see if that helps I have the exact same CPU you do, so if you end up having a higher clock, I'd love to know your settings too!
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post #17 of 25
Quote:
Originally Posted by karmuhhhh View Post
You do NOT change your RAM settings via Overdrive. You actually should not be using Overdrive for anything; use your BIOS.

Also, if you are too lazy to stress test with Prime, then you shouldn't overclock.
This^

Quote:
Originally Posted by sakai4eva View Post
I see...

So at this point, this is what I tried yesterday night and it crashed after 15 minutes of gaming (sorry, too lazy to test using Prime95):
1. Reference clock = 225x15 = 3375
2. HT = 225x9 = 2025
3. CPU Voltage = 1.4V


I haven't changed the RAM settings yet. Where do I change it on the AMD Overdrive? Which setting to tweak? If I'm not mistaken, my RAM defaults to 9-9-9-24@1600, so what should I change it to? Any guidance with screenshots of AMD OverDrive is very appreciated.
I highly dubt the chip is the problem here. That chip should be able to reach that clock speed very easily. The ram is your problem, you need to lower the speed of the ram because as you increase the fsb you increase the ram speed which is most likely causing your instability. USE YOUR BIOS!!! its the way to go.
post #18 of 25
Thread Starter 
Quote:
Originally Posted by karmuhhhh View Post
You do NOT change your RAM settings via Overdrive. You actually should not be using Overdrive for anything; use your BIOS.

Also, if you are too lazy to stress test with Prime, then you shouldn't overclock.
Yes, I've realized that too. But gaming is a good kind of stress test, albeit a more practical one

Quote:
Originally Posted by jellis142 View Post
I highly doubt you need more voltage. Just upping my multiplier to get 3.3Ghz didn't require changing ANYTHING to be 100% stable, but trying to go past 3.3 required tiny increases in voltage. I'll open a window, OC to that again, and post my BIOS settings later and see if that helps I have the exact same CPU you do, so if you end up having a higher clock, I'd love to know your settings too!
220*15 seems to be the max I can stabilize it. I'll be OC'ing via the BIOS tonight to see if it makes any difference.
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post #19 of 25
Thread Starter 
Quote:
Originally Posted by B-roca View Post
This^



I highly dubt the chip is the problem here. That chip should be able to reach that clock speed very easily. The ram is your problem, you need to lower the speed of the ram because as you increase the fsb you increase the ram speed which is most likely causing your instability. USE YOUR BIOS!!! its the way to go.
*writes down lower RAM speed*

Ok... I'll give that a shot. Does that mean I should change the RAM timings from 9-9-9-24 to 8-8-8-21 or something too?
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post #20 of 25
During your cpu overclock, simply take the memory out of the equation for now. Go into your DRAM config and remove the timings (set "both" to auto). This will let the mobo set the timings for the ram.

With my 945, I was able to go 235 fsb freq on stock voltage. I then set the cpu vcore to 1.4050 and the NB Vcore to 1.35. NB Ratio = 10 and HT Ratio = 8, DRAM Ratio = 2.66. I then increased the FSB by 5 and tested using 3 runs of IBT maximum. If it passed, I would increase the FSB by 5 and test again. If it failed, I would add another notch of cpu vcore. This worked like magic and here's where I finally settled on:

FSB Freq = 267
CPU Ratio = 15
CPU Freq = 4005
CPU Vcore = 1.5050
NB Vcore = 1.37
NB Ratio = 10
NB Freq = 2670
HT Ratio = 8
HT Freq = 2136
DRAM Ratio = 2.66
DRAM Speed = 1424

After completing this, I was able to tighten my memory timings to 7-7-7-20-1 @ 1.5v and everything is running like a clock. Max load temp is 46C.

So work the FSB freq first and don't get wrapped around the axle with memory. Because as others have indicated, when you increase the FSB Freq, it increases the DRAM speed and you must lower the DRAM Ratio to account for the increase in Freq.
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