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I feel dumb for asking this question..... about overclocking

DaMulta

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#1
OK now I haven't OCed really with the newer boards with HT in amd so......How do you do the math with HT-Multi-FSB to get say a 4000+ to 2.8 Ghz(Any new CPU). Would it just be Muti times FSB?

Don't flame me to bad I want to know honestly.:nutkick:
 

g12rxz

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#2
yeah, multi and fsb. by the way, its not guru3d or any other forum, flaming isnt much of a problem here, unless were on the topic of religion....
 

DaMulta

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#3
Yea I started a big religion one. So what does the HT do? Someone was telling me last night that it was a big step in the FSB somehow. He didn't explain it very well to me, and this all started because I was trying to help someone do the math to get a good OC.

A few people here may flame me:wtf:
 

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#4
Base clock is 200mhz. Stock HTT multi is x5 to get 1ghz I personally lower this to 3x for most of my OCs. IIRC the multi on a 4000+ is 12x which yields a 2.4ghz stock clock. To get 2.8ghz you'd need to run a FSB of 233mhz. So you'd need to lower your HTT multi to 4x to keep it under 1ghz.

This is VERY VERY shortened. There's an entire socket 939 OC thread over on DFI-Street.com. I believe djbbenn has a link to it in his sig.

EDIT: I appologize for my laziness, here is the link.
 

DaMulta

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#5
Yea I was thinking 10X280 to get 2.8. So this would be a setting of HTT at 5? if it was set at 3 what would it come out to be?
 

DaMulta

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#6
So lets see HT x FSB X Muti thats way to much....See what I'm having problems with.
 
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#7
With your HT at 5, that would be 1400MHz. At 3 the HT would be 840MHz.
 
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#8
Nah, it is FSBxMULTI and HTxFSB.
 
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#9
Yeah check the one in my sig...

HTT link speed is just the link for everything on the board... Best to keep it around 1000MHz or DDR2000. LDT is the multi, so LDT * FSB (some people call the FSB of a A64 based system HT) to give you your HTT speed. CPU clock is CPU Multi * FSB like all systems. There's just anther multiplier basically, and it's not of much importance, unless you go over DDR2000 with it, as it can cause problems. Some boards like the CFX3200 don't even seem to be effected stability wise with a really high HTT. But having it overclocked will yield no extra performance, so it's safer to keep it around 1000MHz or DDR2000.

For example, my system is at 255x11=2805, LDT is 4, so 4x255=1020 or DDR2040.

-Dan
 

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#10
Always turn your HTT down before overclocking.
 

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#11
So am I understanding this. It is this the speed for the memory to talk to the chip? Its not really doing anything with the OCing part of the CPU?
 

DaMulta

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#12
This is your Dram ratio option. This is another one that might be listed different depending on what board you have. The options might look something like this though…

100(Mhz)(1/02), 120(Mhz)(3/05), 133(Mhz)(2/03), 140(Mhz)(7/10), 150(Mhz)(3/04), 166(Mhz)(5/06), 180(Mhz)(9/10), 200(Mhz)(1/01).

When this option is set to 200(1/01) it means your ram is running the same speed as your FSB\HTT. If you lower it then it puts your ram on a ratio which would make it run slower then your FSB\HTT setting. You might want to do this if you have poor overclocking RAM, but still want to overclock your CPU. You can still see good gains in performance from overclocking on a divider.

This formula was posted at Ocforum by deeppow and sharp helped me break it down a little and understand it better.. Please note that your memory speed will change when using different cpu multi's and memory dividers other then 1:1..
 
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#13
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#14
What chip?

HTT is the link for the rest of the mobo, like the expansion slots and such. There's a good explanation of it in that guide on dfi-street.

Simply said, it has no effect on performance if it's over or under the DDR2000. The system just never saturates the available bandwidth it offers, because of its design.

-Dan
 

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#15
The CPU chip I think I'm starting to understand this now.

HT is the Data bus for everything to talk on. So with a super high overclock you still may not has a good performance if this is set to low. It does not have anything to do with the memory because that talks directly to the CPU.
 

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#16
HTTxFSB is going to be your HTT link speed between the proc and ram, this is usually very sensetive

MULTIxFSB is going to increase your cpu frequency AND overclock your RAM

Watch your memory divider, depending on how far you go you may want to lower it so you can compensate.
 

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#17
I'm reading this thing and it gives this example
--------

280x2 = 560Mhz DDR time 3x HTT = 1680Mhz HTT
=============
But memory doesn't talk that fast......does it?
 
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#18
Remember with A64s, that the memory controller is part of the CPU. They're linked directly - this means no FSB for the CPU to communicate to the memory controller. However you still need to link everything else to the CPU... this is where the HT Bus comes in. This is just AMD's naming scheme.

Memory speed is effect by FSB (or HTT as some call it) speeds and dividers. Same as other systems. If you have a s939 system, and are running the memory at 200MHz or 1:1, and your HTT is 200, then your memory is 200MHz. If your LDT is 5x, then you HT Bus is at 1000, or DDR2000. That all being stock.

-Dan
 

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#19
Does any of this change of you are running single channel memory?
 
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#20
One stick? no... Dual channel is just opening another 64bit bus to the memory controller. So you have a 128bit wide bus instead of 64bit, therefore theoretically doubling your bandwidth because you have two channels for read and writes. It has nothing to do with clock frequency.

-Dan
 

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#21
The only reason why I asked that is because of this

Originally Posted by RGone..Converted to 939 by THunDA..hehe
The default speed of a 3200+ Venice with 512mb L2 cache is 10 x 200 or 2000mhz; real cpu mhz. 10 is the multiplier. 200 is the bus speed AND the speed of the memory when set to 1:1 / 200 in Dram configuration. The HTT bus speed of that 3200+ on a NF4 if LTD/FSB ratio is set to AUTO is 5 times 200 or 1000HTT bus speed times 2 for a DDR rating of 2000 for Dual channel NF4 boards. If you set the LTD/FSB ratio to x5 the HTT bus speed itself will again be 1000x2 or DDR2000 the Default for Dual channel NF4 chipset boards.
 
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#22
There he's referring that the 939 has dual channel capabilities, because that was alerted from a s754 system desciption to fit a 939 based system. Also the s754 uses a max of 4x LDT, whilst the s939 has a 5x LDT.

s754 - 200x4=800MHz or DDR1600.

s939 - 200x5=1000MHz or DDR2000.

LDT and HT Bus has nothing to do with memory clock.

-Dan
 

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#23
Thanks for your help on this issue with me.