Confused about T-Birds and multipliers? Please help.

Hulk

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Oct 9, 1999
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My brother recently purchased a system from Compuwiz1 with a IWill KK266 motherboard. I believe that this motherboard runs at 133MHz front side buss.

I also know that there are DDR T-bird systems that run at 266MHz fsb.

As far as I know there are two types of Athlon chips, those with multipliers set for 100MHz bus operation and those set for 266MHz bus operation.

Now I see Athlon chips being sold with either 200MHz fsb or 266FSB. But I thought that the 200MHz fsb was not the chip, just other parts of the chip set.

It the chip multiplier for a 1000MHz 200MHz Athlon 5 or 10.

How about the multiplier for the 266MHz version of the chip.

Finally, my brother want to get a 1400 T-Bird for his new system. Would he get the 200MHz fsb version of the chip.

I'm really confused on this whole issue and would really appreciate some clarification.

Is the memory and fsb bus not in sync? ie 200Mhz fsb (really 100MHz for processor), but 133MHz for memory?

Very confused,

Mark
 

jchu14

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Jul 5, 2001
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Ok this is confusing but here goes. the motherboard and cpu both are acturally 100mhz or 133mhz. (200 and 266 are 100 and 133 double pumped) Iwill KK266 support both 100 and 133mhz fsb/chips.(200/266 double pumped)(decided by a jumper)

The multiplyer is the speed/100 or 133. soo 1gig would be=133*7.5 or 100*10

Since the kk266 supports both 100 and 133, he can get either kind.

The memory and fsb should be in sync except if you are running a 100fsb chip, you can make the memory 133 with a host+33mhz option in the bios.

I'm sorry if this is confusing. There should be somone esle who could explain it better.
 

Hulk

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Oct 9, 1999
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Thanks, I'm starting to "get it."

So, you can use the same 7.5 multiplier chip for 1000MHz in a 133MHz system as in a 266MHz DDR system. The difference being the DDR system communicates with main memory at 266MHz while the former system only at 133MHz?

Mark
 

jchu14

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Jul 5, 2001
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well no... Just think this 133=266. You can say they're just advertised differently. All t-bird systems are ddr so all are 200/266.

Edit: not all ram are ddr, just the CPU.
 

andri

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Aug 12, 2000
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Note that 100MHz DDR DOES NOT equal 200MHz ! It's just a marketing trick. *Real* 200MHz would be better than 100 DDR :)
 

Hulk

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Oct 9, 1999
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Confused.

Aren't there Athlon systems with 100MHz, 133MHz, and 266MHz DDR memory?

I know that the Athlon mobo is doubled pumped. 100MHz memory access timing but 200MHz for other parts of mobo.

Please give me some examples of fsb, memory access speed, and clock multiplier for a few different Athlon configurations so I can figure this out.

Thanks for all the help guys,

Mark

PS I've been an Intel guy but am thinking of going AMD since my brother has made the leap.
 

Grendel99

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Dec 12, 2000
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Ok, there are only two types of Athlon chips. Ones based off the 100 mhz FSB (which is same thing as 200, just double pumped) and the 133 mhz fsb ones (same as 266, just double pumped). It is always at 100 MHz FSB or 133 FSB regardless if the memory is DDR SDRAM or SDRAM. It's kinda like the P4, it has a 100 MHz FSB, but it quad pumped so it is sometimes called 400MHz FSB. Getting it now?
 

Hulk

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Oct 9, 1999
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Yes, I think I do.

One question.

Suppose I have 2 Athlon 1400 systems. Both are the 133MHz versions of the chips. One is using PC133 RAM and the other PC2100 DDR. What parts of the motherboard running at different bandwidths?

Thanks again,

Mark