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Hyper Transport and FSB?

post #1 of 14
Thread Starter 
sorry to bother you guys with such a basic question that has probably been answered a million times. i tried to find the answer but couldn't.

i've only OCed Conroes, so i know nothing about how AMDs work. i was looking at the specs of Athlon 64 X2s and FX processors and saw 2000MHz HyperTransport on them. does that mean you can run DDR2 1000 memory at a 1:1 ratio? i'm looking at screenshots from OCed AMDs and see FSBs of not much more than 200MHz.

can someone explain this to me, or at least point me to a thread that already answers this? i didn't see any mention of HyperTransport in your Ultimate Overclocking Guide.

thanks
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The C'roe
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post #2 of 14
The Ultimate OCing Guide is a bit dated
The Memory bus, 200MHz which is dual direction so x2 =400MHz which is than again dubbled with DDR2 for a default of 800.
The same 200MHz bus speed or the CPU of 200MHz is also dual direction effectively 400MHz.
Since both base from 200MHz the OCing works from there.
Looking at a CPU bus of 250MHz since you mentioned DDR2 1000 RAM.
CPU OC to 250MHz, the RAM now actually is pushed to 1000MHz or 250x2x2=1000 (provided the BIOS setting was for DDR2 800). If you intend to excede the 250MHz CPU bus...
So unless you have RAM that can go that high the divider for the RAM's base timing comes into play or timing changes and voltage increases to further increase to the hopefully higher stable speeds... if not back to the divider.
    
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post #3 of 14
Thread Starter 
great answer. thank you. so basically, 200MHz on an AMD = 400MHz on a Conroe as it applies to the FSB. i love the C'roes and was just wondering if i could practically get more out of the system memory by building an AMD next time and using DDR2 1000. is 250MHz possible on air cooling? i got my C'roe E6400 up to 400 without even breaking a sweat - 32 idle, 38 full load on air.
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post #4 of 14
With what cooler?
    
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post #5 of 14
it says scythe infinity in his specs
    
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post #6 of 14
Thread Starter 
yeah, Scythe Infinity. it rox my freakin sox off. the only downside is the size - it won't fit in a case that has a side fan mounted in the middle. i don't really think side fans are necessary anyway though.

so... i still don't see how any of this has anything to do with HyperTransport. i thought HT had something to do with the system bus. what am i missing here?
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post #7 of 14
It is, the HyperTransport speed is calculated by Multiplying the CPU Internal frequency(by default 200mhz) by the HT Multi (default 5x) then this number is doubled. That's why all the A64s are clocked at 200mhz stock.

Nice, in depth article about HyperTransport technologie.
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post #8 of 14
you don't want the htt to go higher than 1000 as system instability can occur, if you have your fsb at (example): 250 your htt multiplier should be x4 = 1000 at 275 x3= 825
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post #9 of 14
Thread Starter 
i'm still at a loss. here...

AMD Athlon 64 X2 4600+

this is listed as having 2000MHz HyperTransport. not 1000. does that mean that HyperTransport is used for more than just memory, and you don't want more than 1000MHz allocated for the RAM? does anybody understand my confusion? it's all so simple for Intel systems. FSB = Memory speed. end of story. my confusion with AMD chips revolves entirely around HT.

i saw the 2000MHz thing and started thinking that AMD chips would allow for faster memory than Intels. my computer has DDR2 800 memory on it in a 1:1 ratio. if AMDs can't go faster than that, i see no reason to switch teams.
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The C'roe
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post #10 of 14
you have a AMDx2, than your htt is @ 2000 when youre on (example): 250 x 4
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