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IS 1866MHz or more FSB ram will work at 1866MHz or 2000MHz with i5 3550 CPU

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  • RAM
  • CPUs
  • Intel i5
  • Memory
Last response: in Memory
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April 23, 2013 10:53:47 AM

If I use a 1866MHz ram or 2000MHz ram with a i5 3550 CPU is those ram will work at 1866MHz or 2000MHz FSB? i5 3550 CPU's FSB is 1600MHz thats why I'm confused.. Please help

More about : 1866mhz fsb ram work 1866mhz 2000mhz 3550 cpu

a c 103 à CPUs
a b } Memory
April 23, 2013 11:00:04 AM

There is no FSB in a computer with a Core i5-3550.

The memory will probably default to DDR3-1333 or DDR3-1600 when you boot for the first time, but then you can set it to 1866 with the XMP profile.
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April 23, 2013 11:14:31 AM

Sakkura said:
There is no FSB in a computer with a Core i5-3550.

The memory will probably default to DDR3-1333 or DDR3-1600 when you boot for the first time, but then you can set it to 1866 with the XMP profile.

Yes sorry. CPU have no FSB. motherboard have. so if I have a motherboard with 1600FSB then will a 1866MHz ram will work at 1866MHz???
& as per I know in intel website they said that i5 3550 supports 1600/1333MHz rams.
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a c 103 à CPUs
a b } Memory
April 23, 2013 11:22:55 AM

It depends on the motherboard. If it supports faster memory, it'll work fine.
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April 23, 2013 11:33:24 AM

Sakkura said:
It depends on the motherboard. If it supports faster memory, it'll work fine.


I have two questions:
1. If I have a 1600 FSB motherboard then a 1866MHz or more speed rams will work at 1600MHz i.e at max FSB of motherboard. right??

2. Peripherals connected to north bridge or FSB of motherboard can not work with a speed which is more than motherbords's max FSB. On that case the peripheral will be downclocked. right??
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a c 103 à CPUs
a b } Memory
April 23, 2013 11:48:24 AM

1. There is no FSB. On an LGA 1155 motherboard, everything runs off the BCLK (100 MHz). Memory has a multiplier, and the motherboard comes with a maximum multiplier.

2. There is no northbridge or FSB! Intel moved some of the northbridge functions onto the CPU, the rest were moved to what used to be the southbridge (they call it the PCH now). The memory communicates directly with the CPU, because that's where the memory controller is now. So there's no longer any FSB limitation on the memory.
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April 23, 2013 12:00:45 PM

Sakkura said:
1. There is no FSB. On an LGA 1155 motherboard, everything runs off the BCLK (100 MHz). Memory has a multiplier, and the motherboard comes with a maximum multiplier.

2. There is no northbridge or FSB! Intel moved some of the northbridge functions onto the CPU, the rest were moved to what used to be the southbridge (they call it the PCH now). The memory communicates directly with the CPU, because that's where the memory controller is now. So there's no longer any FSB limitation on the memory.

Ok.. thats why on intel website they didn' mention about FSB. Only mentioned that 1333/1600MHz ram will work. So If I will use 1866MHz ram then it will be waste of money. right??
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a c 103 à CPUs
a b } Memory
April 23, 2013 12:04:39 PM

jayadratha said:
Ok.. thats why on intel website they didn' mention about FSB. Only mentioned that 1333/1600MHz ram will work. So If I will use 1866MHz ram then it will be waste of money. right??

1333/1600 is what will always work. But the motherboard manufacturers can implement higher speeds if they choose to. So it's just a matter of checking the manufacturers specification for each motherboard model and seeing what they say about maximum memory speed.
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April 23, 2013 12:25:28 PM

Sakkura said:
jayadratha said:
Ok.. thats why on intel website they didn' mention about FSB. Only mentioned that 1333/1600MHz ram will work. So If I will use 1866MHz ram then it will be waste of money. right??

1333/1600 is what will always work. But the motherboard manufacturers can implement higher speeds if they choose to. So it's just a matter of checking the manufacturers specification for each motherboard model and seeing what they say about maximum memory speed.

North bridge is integrated to CPU itself so I think max memory speed is dependend with CPU's inbuilt memory controller. in case of i5 intel said it is 1333/1600
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a c 103 à CPUs
a b } Memory
April 23, 2013 12:30:19 PM

It can go a lot faster in practice, even though Intel only rates it up to 1600.
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April 24, 2013 4:16:16 AM

Sakkura said:
It can go a lot faster in practice, even though Intel only rates it up to 1600.


How much fast?? Do you have tested it or experienced??
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a c 103 à CPUs
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April 24, 2013 7:45:31 AM

I got my memory to run at 1866, but I set it to 1600 to run with lower voltage and timings. But lots of people use faster RAM with the Ivy Bridge CPUs, so if there was a problem we'd have heard about it.
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