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Overclock Advice for AMD 955 BE

post #1 of 19
Thread Starter 
I'm planning to do an overclock of my system and would like some advice from the experts (As I'd like to do my RAM as well, mods, please relocate if there's a more suitable place for this)

Here's the system below:
Motherboard: Asus M4N98TD EVO
CPU: AMD 955 Phenom II BE
RAM: 2x 2Gb GSkill Ripjaws 1600MHz
CPU Fan: Zalman CNPS10X Performa
Tower: CoolerMaster Advanced II 690

I'd like to keep it air cooled, and don't mind spending a bit of money on extra fans.
Running Intel Burn has given me a high of 52deg C for an initial stock setup at an ambient temperature of 13deg C.
CPU-Z reports FSB: DRAM of 1:4.
I'll be using Prime95, Intel Burn Test, memtest86+ for benchmarking; HWMonitor, CPUZ for numbers.

From the post here, it lists a rigorous testing scheme and I don't mind following it. (I seem to have stumbled an even more rigorous one mentioned by another poster but seemed to have lost it. It mentioned 24hour tests and used more than 3 benchmark programs)

So, from reading around, the general impression for the CPU I got was to try:
1. Increase FSB until it became unstable keeping multiplier stock
2. Increase multiplier until unstable keeping FSB stock
3. Find a middle ground and optimise performance


As for the RAM:
1. Lower latencies
2. Try to increase FSB with lowered latencies

Is this advisable?

A) Also, should I be doing the CPU and RAM at the same time? Because I'm afraid just increasing one would create bottlenecks in, say the RAM, and I wouldn't know if I could increase the CPU more.
B) Should I start overclocking the CPU or RAM? And why?
C) Should I try to achieve a FSB: DRAM of 1:1? Is there a real world difference in the otherwise?
D) Would overclocking the Northbridge help?
E) Any other advice you can throw in terms of other benchmarks I can use/testing times, or with regards to overclocking methodology?

Thank you all in advance!
Edited by GaryC - 3/30/11 at 6:36am
    
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post #2 of 19
I'm not an expert, but I'll try to help. Should I make a mistake, do correct me please.

Quote:
As for the RAM:
1. Lower latencies
2. Try to increase FSB with lowered latencies

Is this advisable?

A) Also, should I be doing the CPU and RAM at the same time? Because I'm afraid just increasing one would create bottlenecks in, say the RAM, and I wouldn't know if I could increase the CPU more.
B) Should I start overclocking the CPU or RAM? And why?
C) Should I try to achieve a FSB: DRAM of 1:1? Is there a real world difference in the otherwise?
D) Would overclocking the Northbridge help?
E) Any other advice you can throw in terms of other benchmarks I can use/testing times, or with regards to overclocking methodology?
RAM:
You mean looser timings? it would help OC'ing your ram, but according to what I've read, AMD likes tighter timings. But I wouldn't recommend prioritizing timings over speed.

cpu:
A.) Try OC'ing your cpu first. After all, cpu OC is more benefitial than RAM OC.
Find each of their limits/highest stable overclock. Then OC your cpu to whatever speed you can get stable, then do same with your ram.
Prioritize CPU OC over RAM OC.

B.) CPU. It's the main reason you OC, yes?

C.) This would be better answered by someone more experienced than me.

D.) According to what I've read, NB OC'ing is futile because of its large bandwidth. You wouldn't notice any speed boosts.

E.) Err, I have none. Good luck!

Please correct me if I made a mistake.


edit: Welcome to OCN! 13*C ambient. O_O Where do you live? And why not fill in your system specs here, so you wouldn't need to type it every time. Try making an introduction thread here as well, so people can know more about you.
Edited by choLOL - 3/30/11 at 11:14am
post #3 of 19
Thread Starter 
Quote:
Originally Posted by choLOL View Post
RAM:
You mean looser timings? it would help OC'ing your ram, but according to what I've read, AMD likes tighter timings. But I wouldn't recommend prioritizing timings over speed.
I mean tighter timings, ie, lowering the numbers to reduce latency. So, ok, MHz is of a higher priority.

Quote:
Originally Posted by choLOL View Post
cpu:
A.) Try OC'ing your cpu first. After all, cpu OC is more benefitial than RAM OC.
Find each of their limits/highest stable overclock. Then OC your cpu to whatever speed you can get stable, then do same with your ram.
Prioritize CPU OC over RAM OC.

B.) CPU. It's the main reason you OC, yes?
Yes! Ok, CPU over RAM.

Quote:
Originally Posted by choLOL View Post
D.) According to what I've read, NB OC'ing is futile because of its large bandwidth. You wouldn't notice any speed boosts.
What about needing to increase the voltage? I see there are a few people on the OC Club that have increased the NB voltage.

Quote:
Originally Posted by choLOL View Post
edit: Welcome to OCN! 13*C ambient. O_O Where do you live? And why not fill in your system specs here, so you wouldn't need to type it every time. Try making an introduction thread here as well, so people can know more about you.
Filled that out. I live in Adelaide and it's approaching autumn now. It's rather cold for this time of year, actually.
    
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post #4 of 19
With AMD cpus, the most optimal way would to make your 1600 ram work is to have a 240 base clock thingy and a multiplier of x6.66 for the ram.
Then IF YOU HAVE PROPER COOLING, you can up or lower the cpu multiplier as needed, along with the Northbridge. Be sure to have proper MOSFET cooling if you're on a 4+1 power phase design and up the voltages as neccesary. You seem fine for MOSFET cooling.

AMD memory controller prefers tighter timings.
So lower CL is better.

The max voltage of AMD Cpus is anywhere from 1.45-1.55
Edited by Shomiyamu! - 3/30/11 at 9:01pm
    
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post #5 of 19
Quote:
Be sure to have proper MOSFET cooling if you're on a 4+1 power phase design and up the voltages as neccesary.
even so..don't even try going over 1.47v on a 4+1 phase motherboard regardless even if its one from Asus or any reputable Board maker..

tightening your ram timings will either require more voltage to the RAM's and as well as with your CPU-NB voltage..if your going to max out at 1600 the tightest you can get is around CAS 6..but not sure if the quality of your RAM can hold on to it..you can be sage with CAS 7 tho..
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post #6 of 19
Quote:
Originally Posted by kairi_zeroblade View Post
even so..don't even try going over 1.47v on a 4+1 phase motherboard regardless even if its one from Asus or any reputable Board maker..

tightening your ram timings will either require more voltage to the RAM's and as well as with your CPU-NB voltage..if your going to max out at 1600 the tightest you can get is around CAS 6..but not sure if the quality of your RAM can hold on to it..you can be sage with CAS 7 tho..
Well it depends on what kit you have.
http://www.newegg.com/Product/Produc...82E16820231277
or
http://www.newegg.com/Product/Produc...82E16820231303

I have the 2nd kit and it really holds up well with little increase to the voltage to let it run at CL6
    
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post #7 of 19
run your nb up to 27-2800. it helps immensely. most if not all c3 can hit 2800
1:4 ram ratio doesnt matter. there is no longer a front side bus on amd.
there is a short guide for quick testing with prime95. not foolproof but it lets you know if youre in the rightpark. then you just have to find the right ballgame.
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post #8 of 19
Thread Starter 
Quote:
Originally Posted by Shomiyamu! View Post
With AMD cpus, the most optimal way would to make your 1600 ram work is to have a 240 base clock thingy and a multiplier of x6.66 for the ram.
Then IF YOU HAVE PROPER COOLING, you can up or lower the cpu multiplier as needed, along with the Northbridge. Be sure to have proper MOSFET cooling if you're on a 4+1 power phase design and up the voltages as neccesary. You seem fine for MOSFET cooling.

AMD memory controller prefers tighter timings.
So lower CL is better.

The max voltage of AMD Cpus is anywhere from 1.45-1.55
That RAM tuning is after I achieve a stable OC, right?

This is there you lose me. I believe my motherboard (last time I remember) has only 2 slots for fans that are PWM (I think):
Asus website quotes: 2 x Chassis Fan connector (1 x 3 pin, 1 x 4 pin)
This is in addition to the CPU fan connector. My other chassis fan is connected straight to the power supply Molex connector. And from what I know, the molex doesn't vary the speed with regards to internal temperature but the 3/4 pins do? Could I know what a MOSFET cooling/connector is?

What does the 4+1 or 8+1 phase imply for overclocking?

Quote:
Originally Posted by kairi_zeroblade View Post
even so..don't even try going over 1.47v on a 4+1 phase motherboard regardless even if its one from Asus or any reputable Board maker..

tightening your ram timings will either require more voltage to the RAM's and as well as with your CPU-NB voltage..if your going to max out at 1600 the tightest you can get is around CAS 6..but not sure if the quality of your RAM can hold on to it..you can be sage with CAS 7 tho..
I doubt I'll be able to get to CAS 6 because my RAM starts off at a 9.
Edited by GaryC - 3/30/11 at 9:42pm
    
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post #9 of 19
4+1 = 4 Phases to CPU, 1 Phase to IMC

The more power you pump through a 4 phase VRM the Hotter it gets, which is very very bad if you overclock a higher wattage CPU. 8+1 Phase it's spread over more VRMs so it's not as hot pushing the same voltage.

It can be bad if you OC on a 4+1 Mobo....Burn house down bad.
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post #10 of 19
Thread Starter 
What increments can I go at/is recommended? 1MHz or 5MHz?
    
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