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AMD Overclock Guide for newbs! - Page 2

post #11 of 32
Nice guide, but I think you may be explaining the CPU-NB a bit wrong... The CPU-NB is now integrated into the CPU and is where the Integrate Memory Controller resides and also (I believe) controls the speed of your L3 cache. There is a separate NorthBridge that is not integrated into the CPU (790FX chipset, for example) that controls communication with peripherals, such as the PCIe lanes, etc. The CPU-NB voltage should be increased as needed, but there really should not be a reason to increase NB voltage.
    
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post #12 of 32
Quote:
Originally Posted by fball922;12103942 
Nice guide, but I think you may be explaining the CPU-NB a bit wrong... The CPU-NB is now integrated into the CPU and is where the Integrate Memory Controller resides and also (I believe) controls the speed of your L3 cache. There is a separate NorthBridge that is not integrated into the CPU (790FX chipset, for example) that controls communication with peripherals, such as the PCIe lanes, etc. The CPU-NB voltage should be increased as needed, but there really should not be a reason to increase NB voltage.

To explain that in a different way, not saying your wrong though but, the NB or North Bridge is the communication link between all aspects of your system, RAM, ROM, BIOS, IMC, GPU, CPU etc... Increasing this communication link will increase stability in the system, and increase speed to each component that you are OCing. So this is why it is necessary and strongly recommended to OC the NB when OCing in general, so you can increase the stability of your OC
    
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post #13 of 32
Quote:
Originally Posted by fRingE;12104026 
To explain that in a different way, not saying your wrong though but, the NB or North Bridge is the communication link between all aspects of your system, RAM, ROM, BIOS, IMC, GPU, CPU etc... Increasing this communication link will increase stability in the system, and increase speed to each component that you are OCing. So this is why it is necessary and strongly recommended to OC the NB when OCing in general, so you can increase the stability of your OC

See I think you are saying the same thing he said.

In AMD systems, the NorthBridge no longer communicates with the RAM or IMC. The "CPU-NB" does that, the Northbridge communicates with the rest. So when you increase the reference clock, you will want to raise the CPU-NB voltage if you become unstable, but not the NB (NorthBridge) voltage.

See my picture... Notice how the CPU-NB is in the same package as the CPU. I am not sure exactly where the HTT link connects in there(besides connecting the CPU and NorthBridge), but that is beside the point.
Edited by fball922 - 1/22/11 at 3:36pm
    
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post #14 of 32
Quote:
Originally Posted by fball922;12104258 
See I think you are saying the same thing he said.

In AMD systems, the NorthBridge no longer communicates with the RAM or IMC. The "CPU-NB" does that, the Northbridge communicates with the rest. So when you increase the reference clock, you will want to raise the CPU-NB voltage if you become unstable, but not the NB (NorthBridge) voltage.

See my picture... Notice how the CPU-NB is in the same package as the CPU. I am not sure exactly where the HTT link connects in there(besides connecting the CPU and NorthBridge), but that is beside the point.

Quite interesting. +1 rep
    
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post #15 of 32
Thread Starter 
Quote:
Originally Posted by fball922;12104258 
See I think you are saying the same thing he said.

In AMD systems, the NorthBridge no longer communicates with the RAM or IMC. The "CPU-NB" does that, the Northbridge communicates with the rest. So when you increase the reference clock, you will want to raise the CPU-NB voltage if you become unstable, but not the NB (NorthBridge) voltage.

See my picture... Notice how the CPU-NB is in the same package as the CPU. I am not sure exactly where the HTT link connects in there(besides connecting the CPU and NorthBridge), but that is beside the point.

Thanks for the feedback, I actually discovered this information myself yesterday too. I will be adding a piece about IMC with regards to the CPU-NB. The model I was basing my guide on there was based on pre-deneb/athlon AMD. I will be correcting it tonight (right now as a matter of fact). I will also be adding some other information suggested by another OCN member. Another rep+ from me for the feedback.

Please more feedback people, I want this to be the most complete yet easy to understand overclocking guide ever made for all deneb/thuban owners. Thanks again!
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post #16 of 32
Nice guide man biggrin.gif +1
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post #17 of 32
Just glad I could help!
    
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post #18 of 32
I should also add that I think you should state in the guide that all systems should keep the HTT speed in the region you specified for gaming rigs (-200, +100). The HTT link actually loses performance as you speed it up outside that range and is highly likely to introduce instability.

This page has an incredible breakdown of RAM (speed vs latency on AMD systems), CPU-NB speeds, and HT speeds and their effect on performance. Definitely worth looking over. Here is one graph of interest for the HT speed:

http://www.ocztechnologyforum.com/forum/showthread.php?56715-AMD-AM3-CPU-s-which-ram-speed-is-faster-and-which-CPU-NB-clock-is-best

HT_3dmark.png
    
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post #19 of 32
Thread Starter 
I'll take a look at that one, thanks again man.

Did you see that I revised the communications diagram in the guide?

Keep the feedback coming, I am studying up for a 3rd revision of the guide.
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post #20 of 32
Quote:
Originally Posted by stonedzen;12130474 
I'll take a look at that one, thanks again man.

Did you see that I revised the communications diagram in the guide?

Keep the feedback coming, I am studying up for a 3rd revision of the guide.

Yep, looks good. And in case I came off a little vague in my last post, I think you should just simply advise against any overclocking of HTT at all (I mean, even if there was a slight benefit to overclocking your HTT at extreme speeds, that person who needs it probably isn't reading the beginner's guide tongue.gif)
    
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